摘要
根据长期田间定位试验,对旱地农田土壤硝态氮累积的原因进行了分析。结果表明,渭北旱塬质地疏松的黑垆土有利于作物根系的下扎,利用土壤深层储水,也有利于降水的入渗。大气7—9月降水对土壤硝态氮有极强的淋溶能力,使其向土壤深层运动,并在深层累积,硝态氮向土体深层迁移存在着源与动力的错位性。旱地土壤不宜单独大量施用氮肥,尽管旱塬地土壤N素不会大量进入水体,造成水体污染,但是其在剖面的大量累积可能成为气体污染源。
Reasons that nitrate is accumulated in soil profiles were studied according to a long- term field experiment. It has been indicated that loosen black loessial soil benefited growth of winter wheat roots, which could make use of soil water in deep layers of the soil, and it also benefited infiltration of precipitation. Nitrate leaching derived from precipitation of July, August and September months mostly, and the nitrate moved under soil surface and accumulated in soil deep layers. Although nitrate did not enter into water, the accumulations indicated that we should pay attentions to other ways of possible pollutions.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2003年第3期263-266,共4页
Journal of Agro-Environment Science
基金
中国科学院知识创新方向性项目(KZCX2-413)
中国生态网络CERN研究项目
