The essential cause is soil and water loss, land desertifieation, shortage of water resource, overexploitation of water and serious pollution, serious soil pollution and secondary salinization.

• 水土流失、土地沙漠化、水资源日显短缺、水体过度开采和污染加剧、土壤污染和次生盐渍化是水土环境恶化的根本原因。