Derivation of grassland degradation
Grassland degradation degree
grassland degradation index
Grassland Degradation Index GDI
Grassland Degradation Trend Coefficient
Succession of grassland degradation
the grassland degradation
Black Soil Type degradation grassland
Degradation of grassland
‘black soil type’ degraded grassland
“Black soil type” deteriorated grassland
“black soil type”deteriorated grassland
“Black soil”degraded grassland
“Black-soil” type degraded grassland
adequate rate of utilization of grassland forages
Advanced comprehensive and sequential classification of grassland