Standard number: QX/T 494-2019
Standard name: Grade
of monitoring and evaluating for terrestrial vegetation meteorology and ||
tt||cological quality
Standard format: PDF
Release time: 2019-09-18
Implementation time: 2019-12-01
Standard size: 1212K
Standard introduction: This standard was drafted in accordance with the rules given in GB/T1.1-2009.
This standard was proposed and managed by the National Technical Committee for Agricultural Meteorology Standardization (SAC/TC539). The drafting units of this standard are: National Meteorological Center, Guangxi Zhuang Autonomous Region Meteorological Bureau, Jiangxi Provincial Meteorological Bureau. The main drafters of this standard are Qian Shuan, Cao Yun, Yan Hao, Wu Menxin, Cheng Lu, Xu Lingling, Xue Hongxi, Yang Xin, and Wang Huaiqing. This standard specifies the monitoring and evaluation methods and levels of meteorological conditions for terrestrial vegetation growth and vegetation coverage, net primary productivity of vegetation, and vegetation ecological quality
.
This standard applies to the monitoring and evaluation of meteorological conditions for terrestrial vegetation growth and vegetation ecological quality throughout the year or growing season.
2 Terms and definitions
The following terms and definitions apply to this document
. Meteorological condition of terrestrial vegetation growth The condition of meteorological factors such as heat, moisture, and sunshine that affect the growth of terrestrial vegetation.
Meteorological condition index of terrestrial vegetation growth
A quantitative value calculated based on meteorological factors such as light, temperature, and water that reflects the degree to which meteorological conditions are favorable to the growth of terrestrial vegetation.
2.3
Normalized difference vegetation index;NDvI
The difference in reflectance between the near-infrared and red bands divided by the sum of the two.
[GB/T34814-2017, definition 2.10]
2.4
Vegetation coverage
The percentage of the vertical projection area of ​​the vegetation canopy to the corresponding surface area.
Note: Rewritten from QXT183-2013, definition 3.4
This standard specifies the monitoring and evaluation methods and levels of meteorological conditions for terrestrial vegetation growth and vegetation coverage, net primary productivity of vegetation, and ecological quality of vegetation. This standard is applicable to the monitoring and evaluation of meteorological conditions for terrestrial vegetation growth and ecological quality of vegetation throughout the year or growing season.

ICS07.060
Meteorological Industry Standard of the People's Republic of China
QX/T494—2019
Grade of monitoring and evaluating for terrestrial vegetation meteorology and ecological quality
Industry Standard Information Service Platform
Published on September 18, 2019
China Meteorological Administration
Implemented on December 1, 2019
Industry Standard Information Service Platform
2 Terms and Definitions
3 Monitoring and Evaluation Methods and Grades
Appendix A (Normative Appendix)
Appendix B (Normative Appendix)
Appendix C (Normative Appendix) Appendix D (Normative Appendix)
References
Calculation method of meteorological condition index for terrestrial vegetation growth
Estimation method of terrestrial vegetation net primary productivity
Calculation method of terrestrial vegetation ecological quality index QX/T494—2019
Industry standard information service platform
Industry standard information service platform
This standard was drafted in accordance with the rules given in GB/T1.1—2009. This standard was proposed and managed by the National Technical Committee for Agricultural Meteorology Standardization (SAC/TC539). Drafting units of this standard: National Meteorological Center, Guangxi Zhuang Autonomous Region Meteorological Bureau, Jiangxi Provincial Meteorological Bureau, QX/T494—2019
Main drafters of this standard: Qian Shuan, Cao Yun, Yan Hao, Wu Menxin, Cheng Lu, Xu Lingling, Xue Hongxi, Yang Xin, Wang Huaiqing Industry Standard Information Service Platform
Industry Standard Information Service Platform
1 Scope
Monitoring and evaluation level of meteorological and ecological quality of terrestrial vegetation QX/T494—2019
This standard specifies the monitoring and evaluation methods and levels of meteorological conditions for terrestrial vegetation growth and vegetation coverage, net primary productivity of vegetation, and ecological quality of vegetation.
This standard applies to the monitoring and evaluation of meteorological conditions for terrestrial vegetation growth and ecological quality of vegetation throughout the year or growing season. 2 Terms and definitions
The following terms and definitions apply to this document. 2.1
Meteorological condition of terrestrial vegetation growth The conditions of meteorological factors such as heat, moisture, and sunshine that affect the growth of terrestrial vegetation. 2.2
Meteorological condition index of terrestrial vegetation growth The quantitative value of the favorable degree of meteorological conditions for the growth of terrestrial vegetation calculated by meteorological factors such as light, temperature, and water. 2.3
Normalized difference vegetation index; NDVI The difference in reflectivity between the near-infrared and red bands divided by the sum of the two. [GB/T34814—2017, definition 2.10]
Vegetation coverage
Vegetation coverage
The percentage of the vertical projection area of ​​the vegetation canopy to the corresponding surface area. Note: Rewrite QX/T183203, definition 34. 2.5
Net primary productivity of vegetation Net principal productivity of vegetation The total amount of organic matter remaining after the organic matter fixed by photosynthesis per unit area of ​​vegetation in a certain period of time minus the organic matter consumed by autotrophic respiration.
Note: Measured in carbon (C), the unit is grams per square meter (g/m\). 2.6Www.bzxZ.net
Ecological quality index of terrestrial vegetation Ecological quality index of terrestrial vegetation A quantitative value based on the net primary productivity and coverage of terrestrial vegetation that can reflect the function and coverage of terrestrial ecosystem vegetation. Note: Its size mainly reflects the level of vegetation ecological quality. The larger the value, the better the vegetation ecological quality. 3 Monitoring and evaluation methods and levels
3.1 Monitoring and evaluation content
The monitoring and evaluation content includes four parts: meteorological conditions for terrestrial vegetation growth and net primary productivity of vegetation, vegetation coverage, and vegetation ecological quality.
QX/T494—2019
Meteorological conditions for terrestrial vegetation growth
3.2.1 Thermal conditions
The thermal conditions for terrestrial vegetation growth are expressed as the percentage deviation of the annual or growing season active accumulated temperature from the norm. The calculation method is shown in formula (1): AT=(--T)/T×100%
Wherein:
The percentage deviation of the annual or growing season daily average temperature greater than or equal to 0℃ accumulated temperature; the number of days with daily average temperature greater than or equal to 0℃ in this period; the order of days with daily average temperature greater than or equal to 0℃ in this period; the average temperature of the day in this period, in degrees Celsius (℃); ...(1)
The average value of the annual (for terrestrial vegetation, 10 years or more) accumulated temperature greater than or equal to 0℃ in this period, in degrees Celsius day (℃·d). The interannual comparison monitoring and evaluation levels of thermal conditions for terrestrial vegetation growth are shown in Table 1. Table 1 Interannual comparison monitoring and evaluation levels of thermal conditions for terrestrial vegetation growth Annual or growing season daily average temperature greater than or equal to 0℃ Accumulated temperature anomaly percentage (△T) AT≥10%
5%≤T<10%
0≤AT5%
-5%≤4T<0
10%≤△T<-5%
AT<-10%
3.2.2 Moisture conditions
Monitoring and evaluation level
Normal preference
Positive The constant deviation
contains interest services
The moisture conditions for terrestrial vegetation growth are expressed as the percentage of the annual or growing season cumulative precipitation. The calculation method is shown in formula (2): C,,-P)/P×100%
....(2)
In the formula:
The number of days in the period;
The sequence of days in the period;
The precipitation on the day of the period, in millimeters (mm); p
The normal precipitation in the period (for terrestrial vegetation, It is the average value of 10 years or more, and the single box is in millimeters (mm). p
The inter-annual comparison monitoring and evaluation level of water conditions for terrestrial vegetation growth is shown in Table 2. Table 2 Inter-annual comparison monitoring and evaluation level of water conditions for terrestrial vegetation growth Annual or growing season cumulative precipitation anomaly percentage (△P) AP ≥ 50%
25% ≤ 4P < 50%
Monitoring and evaluation level
Inter-annual comparison monitoring and evaluation level of water conditions for terrestrial vegetation growth (continued) Annual or growing season cumulative precipitation Percentage of deviation from the average (P) 0≤AP<25%
—25%≤AP<0
50%≤P<-25%
AP<-50%
Sunshine conditions
QX/T494—2019
Monitoring and evaluation level
Normal preference
Normal deviation
Sunshine conditions for terrestrial vegetation growth are expressed as the percentage deviation from the average of the cumulative sunshine hours for the whole year or growing season. The calculation method is shown in formula (3): AS = (2,=is -3)/S×100%
Wherein:
Percent deviation of the cumulative sunshine hours for the whole year or growing season; the number of days in this period;
Day sequence in this period:
The sunshine hours of the day in this period, in hours (h); the annual (for terrestrial vegetation, 10 years or more) average value of sunshine hours in this period, in hours (h). The inter-annual comparative monitoring and evaluation levels of terrestrial vegetation growth sunshine conditions are shown in Table 3. Table 3
Inter-annual comparative monitoring and evaluation levels of terrestrial vegetation growth sunshine conditions throughout the year Or the percentage of anomaly of cumulative sunshine hours in the growing season (AS)AS≥20%
10%4S20%
4S<10%
0%≤4S0
20%≤4-10%
Standard
3.2.4 Comprehensive meteorological conditions
Monitoring and evaluation level
Normal preference
Normal deviation
Comprehensive meteorological conditions are measured by the meteorological condition index for land vegetation growth (I). The calculation method is shown in Appendix A, and the monitoring and evaluation level is shown in Table 4. Table 4
Monitoring reading level of meteorological conditions for land vegetation growth Meteorological condition index for land vegetation growth (I) I=1.0
0.9≤1.0
0.7≤<0.9
0.6≤0.7
Monitoring and supervision level
Relatively favorable
Basically favorable
Basically unfavorable
Relatively unfavorable
QX/T494—2019
The calculation method for interannual comparative monitoring and evaluation of meteorological conditions for terrestrial vegetation growth is shown in formula (4): AI=I-
Wherein:
. (4)
The difference between the meteorological condition index for terrestrial vegetation growth throughout the year or growing season and the normal year (for terrestrial vegetation, 10 years or more) during the same period;
The meteorological condition index for terrestrial vegetation growth during this period: the normal year (for terrestrial vegetation, 10 years or more) average value of the meteorological condition index for vegetation growth during this period. The interannual comparison monitoring and evaluation levels of meteorological conditions for terrestrial vegetation growth are shown in Table 5. Table 5 Interannual comparison monitoring and evaluation levels of meteorological conditions for terrestrial vegetation growth Difference between meteorological condition index for terrestrial vegetation growth and normal year (△I) AI≥0.2
-0.1≤4I<0
-0.2≤4<-0.1
Land vegetation coverage
Land vegetation coverage estimation method is shown in Appendix B, and the monitoring and evaluation levels are shown in Table 6. Table 6 Monitoring and evaluation level of terrestrial vegetation coverage Average terrestrial vegetation coverage throughout the year or growing season (C) C ≥ 80%
Monitoring and evaluation level
Normal preference
Normal deviation
Monitoring and evaluation level
High coverage
Higher coverage
Weixinyi service level
40% ≤ C 60%
20% ≤ C < 40%
5% ≤ C < 20%
Inter-annual comparison calculation method of vegetation coverage is shown in formula (5): AC =CC
Medium coverage
Relatively low coverage
Low coverage
Extremely low coverage
·（5）
Where:
—the difference between the average value of the average terrestrial vegetation cover for the whole year or growing season and the average value of the vegetation cover in the same AC
period in normal years (for terrestrial vegetation, it is 10 years or more);
The average value of the terrestrial vegetation cover in this period: the average value of the terrestrial vegetation cover in the same period in normal years (for terrestrial vegetation, it is 10 years or more). The inter-annual comparative monitoring and evaluation levels of terrestrial vegetation coverage are shown in Table 7. 4
Inter-annual comparative monitoring and evaluation levels of terrestrial vegetation coverageThe difference between the average terrestrial vegetation coverage of the whole year or growing season and the annual normal (AC)AC≥10%
3%≤AC<10%
0≤4C<3%
-3%≤AC0
10%≤C<-3%
AC<-10%
Net primary productivity of terrestrial vegetation
The estimation method of net primary productivity of terrestrial vegetation is shown in Appendix C, and the monitoring and evaluation levels are shown in Table 8. Table 8
Monitoring and evaluation level of net primary productivity of terrestrial vegetation Net primary productivity (NPP) of terrestrial vegetation throughout the year or growing season g/m
NPP≥1000
800≤NPP<1000
600≤NPP<800
400≤NPP600
100≤NPP400
NPP100
Annual comparison calculation method of net primary productivity of terrestrial vegetation is shown in formula (6): △NPP=（NPP-NPP)/NPP×100%| |tt||Annual or growing old vegetation net primary productivity deviation percentage; QX/T494—2019
Monitoring and evaluation level
Significant increase
Remaining the same but slightly increasing
Remaining the same but slightly decreasing
Significant decrease
Monitoring and evaluation level
The net primary productivity of vegetation in this period is measured in grams per square meter (g/m\) of carbon (C); the average value of the net primary productivity of vegetation in the same period of normal years (for terrestrial vegetation, it is more than 10 years) is measured in grams per square meter (g/m\) of carbon (C). The inter-annual comparative monitoring and evaluation levels of net primary productivity of terrestrial vegetation are shown in Table 9. Table 9
Inter-annual comparative monitoring and evaluation levels of net primary productivity of terrestrial vegetationAnnual or growing season net primary productivity of terrestrial vegetation deviation percentage (ANPP)ANPP≥10%
3%≤ANPP10%
0ANPP<3%
3%ANPP0
10%≤ANPP<-3%
ANPP<-10%
Monitoring and evaluation level
Significant increase
Remaining the same or slightly increasing
Remaining the same or slightly decreasing
Significant decrease
QX/T494—2019
Ecological quality of terrestrial vegetation
See Appendix D for the calculation method of the ecological quality index of terrestrial vegetation and the monitoring and evaluation levels are shown in Table 10. Table 10 Monitoring and evaluation level of terrestrial vegetation ecological quality Annual or growing season terrestrial vegetation ecological quality index (Q) Q≥80
60Q<80
50≤Q<60
40≤Q<50
20≤Q<40
Monitoring and evaluation level
Medium preference
Medium deviation
Inter-annual comparison of terrestrial vegetation ecological quality is expressed as the deviation percentage of the annual or growing season terrestrial vegetation ecological quality index. The calculation method is shown in formula (7):
AQ=（QQ)/Q×100%
Where:
△Q—the deviation percentage of the annual or growing season terrestrial vegetation ecological quality index; Q
The terrestrial vegetation ecological quality index in the same period; The average value of the terrestrial vegetation ecological quality index in the same period of normal years (for terrestrial vegetation, it is 10 years or more). The inter-annual comparison monitoring and evaluation levels of terrestrial vegetation ecological quality are shown in Table 11. Table 11 Inter-annual comparison monitoring and evaluation levels of terrestrial vegetation ecological quality Annual or growing season terrestrial vegetation ecological quality index deviation percentage (△Q) AQ ≥ 10% || tt || % ≤ 494 10% || tt || 0 ≤ 4 Q-3% || tt || Monitoring and evaluation level || tt || Weixinyi service platform || tt || Balance preference || tt || 3% ≤ AQ < 0 || tt || 10% ≤ Q-3% || tt || AQ <-10% || tt || Balance deviation || tt || .... (7)1
Land vegetation coverage
The estimation method of land vegetation coverage is shown in Appendix B, and the monitoring and evaluation levels are shown in Table 6. Table 6 Monitoring and evaluation levels of land vegetation coverage Average land vegetation coverage throughout the year or growing season (C) C ≥ 80%
Monitoring and evaluation level
Normal preference
Normal deviation
Monitoring and evaluation level
High coverage
Higher coverage
Weixinyi service level
40%≤C60%
20%≤C<40%
5%≤C<20%
The calculation method for interannual comparison of vegetation coverage is shown in formula (5): AC =CC
Medium coverage
Relatively low coverage
Low coverage
Extremely low coverage
·（5）
Where:
—the difference between the average value of the average terrestrial vegetation cover for the whole year or growing season and the average value of the vegetation cover in the same AC
period in normal years (for terrestrial vegetation, it is 10 years or more);
The average value of the terrestrial vegetation cover in this period: the average value of the terrestrial vegetation cover in the same period in normal years (for terrestrial vegetation, it is 10 years or more). The inter-annual comparative monitoring and evaluation levels of terrestrial vegetation coverage are shown in Table 7. 4
Inter-annual comparative monitoring and evaluation levels of terrestrial vegetation coverageThe difference between the average terrestrial vegetation coverage of the whole year or growing season and the annual normal (AC)AC≥10%
3%≤AC<10%
0≤4C<3%
-3%≤AC0
10%≤C<-3%
AC<-10%
Net primary productivity of terrestrial vegetation
The estimation method of net primary productivity of terrestrial vegetation is shown in Appendix C, and the monitoring and evaluation levels are shown in Table 8. Table 8
Monitoring and evaluation level of net primary productivity of terrestrial vegetation Net primary productivity (NPP) of terrestrial vegetation throughout the year or growing season g/m
NPP≥1000
800≤NPP<1000
600≤NPP<800
400≤NPP600
100≤NPP400
NPP100
Annual comparison calculation method of net primary productivity of terrestrial vegetation is shown in formula (6): △NPP=（NPP-NPP)/NPP×100%| |tt||Annual or growing old vegetation net primary productivity deviation percentage; QX/T494—2019
Monitoring and evaluation level
Significant increase
Remaining the same or slightly increasing
Remaining the same or slightly decreasing
Significant decrease
Monitoring and evaluation level
The net primary productivity of vegetation in this period is measured in carbon (C), in grams per square meter (g/m\); the average value of the net primary productivity of vegetation in the same period of normal years (for terrestrial vegetation, it is more than 10 years), in carbon (C), in grams per square meter (g/m). The inter-annual comparative monitoring and evaluation levels of net primary productivity of terrestrial vegetation are shown in Table 9. Table 9
Inter-annual comparative monitoring and evaluation levels of net primary productivity of terrestrial vegetationAnnual or growing season net primary productivity of terrestrial vegetation deviation percentage (ANPP)ANPP≥10%
3%≤ANPP10%
0ANPP<3%
3%ANPP0
10%≤ANPP<-3%
ANPP<-10%
Monitoring and evaluation level
Significant increase
Remaining the same or slightly increasing
Remaining the same or slightly decreasing
Significant decrease
QX/T494—2019
Ecological quality of terrestrial vegetation
See Appendix D for the calculation method of the ecological quality index of terrestrial vegetation and the monitoring and evaluation levels are shown in Table 10. Table 10 Monitoring and evaluation level of terrestrial vegetation ecological quality Annual or growing season terrestrial vegetation ecological quality index (Q) Q≥80
60Q<80
50≤Q<60
40≤Q<50
20≤Q<40
Monitoring and evaluation level
Medium preference
Medium deviation
Inter-annual comparison of terrestrial vegetation ecological quality is expressed as the percentage deviation of the annual or growing season terrestrial vegetation ecological quality index. The calculation method is shown in formula (7):
AQ=（QQ)/Q×100%
Where:
△Q—the percentage deviation of the annual or growing season terrestrial vegetation ecological quality index; Q
The ecological quality index of terrestrial vegetation in the same period; the average value of the ecological quality index of terrestrial vegetation in the same period of normal years (for terrestrial vegetation, it is 10 years or more). The inter-annual comparison monitoring and evaluation levels of terrestrial vegetation ecological quality are shown in Table 11. Table 11 Inter-annual comparison monitoring and evaluation levels of terrestrial vegetation ecological quality Annual or growing season terrestrial vegetation ecological quality index deviation percentage (△Q) AQ ≥ 10% || tt || % ≤ 494 10% || tt || 0 ≤ 4 Q-3% || tt || Monitoring and evaluation level || tt || Weixinyi service platform || tt || Balance preference || tt || 3% ≤ AQ < 0 || tt || 10% ≤ Q-3% || tt || AQ <-10% || tt || Balance deviation || tt || .... (7)1
Land vegetation coverage
The estimation method of land vegetation coverage is shown in Appendix B, and the monitoring and evaluation levels are shown in Table 6. Table 6 Monitoring and evaluation levels of land vegetation coverage Average land vegetation coverage throughout the year or growing season (C) C ≥ 80%
Monitoring and evaluation level
Normal preference
Normal deviation
Monitoring and evaluation level
High coverage
Higher coverage
Weixinyi service level
40%≤C60%
20%≤C<40%
5%≤C<20%
The calculation method for interannual comparison of vegetation coverage is shown in formula (5): AC =CC
Medium coverage
Relatively low coverage
Low coverage
Extremely low coverage
·（5）
Where:
—the difference between the average value of the average terrestrial vegetation cover for the whole year or growing season and the average value of the vegetation cover in the same AC
period in normal years (for terrestrial vegetation, it is 10 years or more);
The average value of the terrestrial vegetation cover in this period: the average value of the terrestrial vegetation cover in the same period in normal years (for terrestrial vegetation, it is 10 years or more). The inter-annual comparative monitoring and evaluation levels of terrestrial vegetation coverage are shown in Table 7. 4
Inter-annual comparative monitoring and evaluation levels of terrestrial vegetation coverageThe difference between the average terrestrial vegetation coverage of the whole year or growing season and the annual normal (AC)AC≥10%
3%≤AC<10%
0≤4C<3%
-3%≤AC0
10%≤C<-3%
AC<-10%
Net primary productivity of terrestrial vegetation
The estimation method of net primary productivity of terrestrial vegetation is shown in Appendix C, and the monitoring and evaluation levels are shown in Table 8. Table 8
Monitoring and evaluation level of net primary productivity of terrestrial vegetation Net primary productivity (NPP) of terrestrial vegetation throughout the year or growing season g/m
NPP≥1000
800≤NPP<1000
600≤NPP<800
400≤NPP600
100≤NPP400
NPP100
Annual comparison calculation method of net primary productivity of terrestrial vegetation is shown in formula (6): △NPP=（NPP-NPP)/NPP×100%| |tt||Annual or growing old vegetation net primary productivity deviation percentage; QX/T494—2019
Monitoring and evaluation level
Significant increase
Remaining the same or slightly increasing
Remaining the same or slightly decreasing
Significant decrease
Monitoring and evaluation level
The net primary productivity of vegetation in this period is measured in carbon (C), in grams per square meter (g/m\); the average value of the net primary productivity of vegetation in the same period of normal years (for terrestrial vegetation, it is more than 10 years), in carbon (C), in grams per square meter (g/m). The inter-annual comparative monitoring and evaluation levels of net primary productivity of terrestrial vegetation are shown in Table 9. Table 9
Inter-annual comparative monitoring and evaluation levels of net primary productivity of terrestrial vegetationAnnual or growing season net primary productivity of terrestrial vegetation deviation percentage (ANPP)ANPP≥10%
3%≤ANPP10%
0ANPP<3%
3%ANPP0
10%≤ANPP<-3%
ANPP<-10%
Monitoring and evaluation level
Significant increase
Remaining the same or slightly increasing
Remaining the same or slightly decreasing
Significant decrease
QX/T494—2019
Ecological quality of terrestrial vegetation
See Appendix D for the calculation method of the ecological quality index of terrestrial vegetation and the monitoring and evaluation levels are shown in Table 10. Table 10 Monitoring and evaluation level of terrestrial vegetation ecological quality Annual or growing season terrestrial vegetation ecological quality index (Q) Q≥80
60Q<80
50≤Q<60
40≤Q<50
20≤Q<40
Monitoring and evaluation level
Medium preference
Medium deviation
Inter-annual comparison of terrestrial vegetation ecological quality is expressed as the percentage deviation of the annual or growing season terrestrial vegetation ecological quality index. The calculation method is shown in formula (7):
AQ=（QQ)/Q×100%
Where:
△Q—the percentage deviation of the annual or growing season terrestrial vegetation ecological quality index; Q
The ecological quality index of terrestrial vegetation in the same period; the average value of the ecological quality index of terrestrial vegetation in the same period of normal years (for terrestrial vegetation, it is 10 years or more). The inter-annual comparison monitoring and evaluation levels of terrestrial vegetation ecological quality are shown in Table 11. Table 11 Inter-annual comparison monitoring and evaluation levels of terrestrial vegetation ecological quality Annual or growing season terrestrial vegetation ecological quality index deviation percentage (△Q) AQ ≥ 10% || tt || % ≤ 494 10% || tt || 0 ≤ 4 Q-3% || tt || Monitoring and evaluation level || tt || Weixinyi service platform || tt || Balance preference || tt || 3% ≤ AQ < 0 || tt || 10% ≤ Q-3% || tt || AQ <-10% || tt || Balance deviation || tt || .... (7)The monitoring and evaluation levels are shown in Table 10. Table 10 Monitoring and evaluation level of terrestrial vegetation ecological quality Annual or growing season terrestrial vegetation ecological quality index (Q) Q≥80
60Q<80
50≤Q<60
40≤Q<50
20≤Q<40
Monitoring and evaluation level
Medium preference
Medium deviation
Inter-annual comparison of terrestrial vegetation ecological quality is expressed as the percentage deviation of the annual or growing season terrestrial vegetation ecological quality index. The calculation method is shown in formula (7):
AQ=（QQ)/Q×100%
Where:
△Q—the percentage deviation of the annual or growing season terrestrial vegetation ecological quality index; Q
The ecological quality index of terrestrial vegetation in the same period; the average value of the ecological quality index of terrestrial vegetation in the same period of normal years (for terrestrial vegetation, it is 10 years or more). The inter-annual comparison monitoring and evaluation levels of terrestrial vegetation ecological quality are shown in Table 11. Table 11 Inter-annual comparison monitoring and evaluation levels of terrestrial vegetation ecological quality Annual or growing season terrestrial vegetation ecological quality index deviation percentage (△Q) AQ ≥ 10% || tt || % ≤ 494 10% || tt || 0 ≤ 4 Q-3% || tt || Monitoring and evaluation level || tt || Weixinyi service platform || tt || Balance preference || tt || 3% ≤ AQ < 0 || tt || 10% ≤ Q-3% || tt || AQ <-10% || tt || Balance deviation || tt || .... (7)The monitoring and evaluation levels are shown in Table 10. Table 10 Monitoring and evaluation level of terrestrial vegetation ecological quality Annual or growing season terrestrial vegetation ecological quality index (Q) Q≥80
60Q<80
50≤Q<60
40≤Q<50
20≤Q<40
Monitoring and evaluation level
Medium preference
Medium deviation
Inter-annual comparison of terrestrial vegetation ecological quality is expressed as the percentage deviation of the annual or growing season terrestrial vegetation ecological quality index. The calculation method is shown in formula (7):
AQ=（QQ)/Q×100%
Where:
△Q—the percentage deviation of the annual or growing season terrestrial vegetation ecological quality index; Q
The ecological quality index of terrestrial vegetation in the same period; the average value of the ecological quality index of terrestrial vegetation in the same period of normal years (for terrestrial vegetation, it is 10 years or more). The inter-annual comparison monitoring and evaluation levels of terrestrial vegetation ecological quality are shown in Table 11. Table 11 Inter-annual comparison monitoring and evaluation levels of terrestrial vegetation ecological quality Annual or growing season terrestrial vegetation ecological quality index deviation percentage (△Q) AQ ≥ 10% || tt || % ≤ 494 10% || tt || 0 ≤ 4 Q-3% || tt || Monitoring and evaluation level || tt || Weixinyi service platform || tt || Balance preference || tt || 3% ≤ AQ < 0 || tt || 10% ≤ Q-3% || tt || AQ <-10% || tt || Balance deviation || tt || .... (7)
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