TY  - Data
T1  - Spatial distribution of ecosystem stability in semi-arid areas of northern China
A1  - Liu Shulin
A1  - None
A1  - Liao Jie
DO  - 10.12072/ncdc.ZDYF.db1682.2022
PY  - 2022
DA  - 2022-04-18
PB  - National Cryosphere Desert Data Center
AB  - The decision tree classification method based on multi index is adopted1. Ecosystem instability index = vegetation variation coefficient * normalized index of wind erosion intensityWhere: Coefficient of variation of vegetation: AVHRR GIMMS data set from 1982 to 2013 and MODIS mod13q1 data set since 2000 are used to carry out unified cutting, projection conversion and data fusion according to the scope of the study area. The net primary productivity (NPP) value of the study area is simulated based on CASA (Carnegie Ames Stanford approach) model, and the NPP data set from January 1982 to December 2016 is retrieved, The coefficient of variation of vegetation in the study area was obtained by further calculationNormalized index of wind erosion intensity:According to the multi-year average soil wind erosion intensity in the study area from 1982 to 2016 simulated and calculated by the modified soil wind erosion model (rweq), the normalized index of soil wind erosion intensity in the study area is calculated through dimensionless calculation, which is used as the main quantitative index for soil stability evaluation2. Degree of ecosystem stability = comprehensive index of vegetation stability * normalized index of wind erosion intensityWhere:Comprehensive index of vegetation stability:For the 1982-2016 time series NPP, the vegetation resilience index, vegetation resistance index to drought and temperature and vegetation variation coefficient are calculated, and the vegetation comprehensive stability index is obtained according to the synthetic calculation of resilience, resistance and time stability.
DB  - NCDC
UR  - http://www.ncdc.ac.cn/portal/metadata/9ee0776f-c53c-4ba1-be79-cccffaef87ae
ER  -