旱地长期施肥对土壤水分的影响

Effects of Long-term Fixed Fertilization on Soil Water

针对黄土高原旱地长期施肥对土壤水分状况的影响进行研究。结果表明 :旱地长期施肥对土壤水分状况有显著影响 ,N、P、M单施或配施 ,土壤剖面含水量比对照均有所下降 ,以 NP、NM、PM、M、NPM处理下降最多。不同氮磷肥配施对土壤水分含量也有较大影响 ,在一定氮、磷水平下 ,土壤剖面储水量随磷或氮肥用量的增加而减少。

A research about effects of long term fixed fertilization on dry land soil water in Loess Plateau showed that long term fertilization has significant influence on soil water. No matter which fertilization forms,N,P,M applied as a simple fertilizer or as a mixed fertilizer, are used,all the treatments' soil water content in profile (0~200 cm) are lower than controlled treatment, esp. in NP,NM,PM,M and NPM. Different ratios of N and P also affect soil water. At certain N or P levels, soil profile water content decreased with the increase of amount of P or N.Although crop yield was increased, the soil water pool was destroyed with the application of fertilizer,producing negative effect on the sustainable development of dry land agriculture.