土壤2017，Vol.49Issue(6)：1179-1186,8.DOI:10.13758/j.cnki.tr.2017.06.017
华北山前平原典型厚包气带硝态氮分布累积规律
Nitrate Distribution and Accumulation in Deep Unsaturated Zone Soils in Piedmont of North China Plain
摘要
Abstract
The unsaturated zone is the link which water and nutrient transforms between atmosphere and aquifer, and it is crucial to study the distribution and accumulation of NO- 3-N for preventing nitrate pollution in groundwater because it is the place where farmland nitrate distribute and accumulate and is the channel that nitrate leaches to the aquifer. In this study, the Geoprobe direct push system was employed to obtain 10.5 meters of continuous soil core samples from the typical deep unsaturated zones in croplands under two different fertilization(N0, no nitrogen fertilizer applied; and N600, 600 kg/(hm2·a) nitrogen fertilizer applied in North China Plain in order to analyze the profile distribution, accumulation and key influential factors of NO- 3-N in soils. The results showed that NO- 3-N remained stable in N0, however, in a long-term application of 600 kg/(hm2·a) nitrogen fertilizer (N600), NO- 3-N leached to 10.5 m and accumulated in the deep unsaturated zone, the peak of accumulation was determined by soil texture and moisture content. The distribution and accumulation of NO- 3-N were mainly affected by water migration, soil texture and denitrification.关键词
厚包气带/硝态氮/分布/累积Key words
Deep unsaturated zone/Nitrate/Distribution/Accumulation分类
农业科技引用本文复制引用
梁慧雅,王仕琴,魏守才..华北山前平原典型厚包气带硝态氮分布累积规律[J].土壤,2017,49(6):1179-1186,8.基金项目
国家自然科学基金面上项目(41471028)和国家自然科学基金重点项目(41530859)资助. （41471028）
