极限干旱历时
critical drought duration
极限水文干旱历时
critical hydrologic drought duration
干旱时空分布
drought spatial distribution
Keetch-Byram干旱指数
Keetch-Byram drought index
LAS环境干旱
the LAS environment drought
Palmer干旱指数
palmer drought severity index
半干旱半湿润地区
Semi-arid and semi-humid region
semid-arid and semi-humid watershed
Semi-arid and Semi-humid Area
半干旱半湿润流域
semi-humid and semi-arid catchment
半干旱半湿润气候区
Semiarid and subhumid climatic region