8 ndvi value in oasis is significantly higher than the value in desert , both of them have different rules in monthly variation . irrigation temperature and precipitation have effect on variation of ndvi in oasis , the correlation coefficients of sparse vegetation ndvi in desert with climatic and hydrological factors are insignificant and meaningless in practice . the drive factors of oasis ndvi are only adapted on oasis in arid land and are not fit to desert system in arid land 8 、绿洲ndvi值显著大于荒漠，二者具有不同的季节变动规律；灌溉、气温和降水是绿洲ndvi变化的驱动因子，荒漠稀疏植被ndvi与绿洲气侯、水文因子相关不显著或无实际意义；绿洲ndvi的驱动因子只适用于干旱区的绿洲区域，而不适用于干旱区荒漠系统。
