旱地农田春麦系统氮素运移现状及改善途径探讨  

The Present Situation and Its Improving Ways of Nitrogen Transport in Farmland Spring Wheat System in Dryland Farming

作　　者：赵世伟[1] 陈国良[1] 郭玉孝[1] 

机构地区：[1]中国科学院水土保持研究所,水利部水土保持研究所

出　　处：《水土保持研究》1996年第1期57-61,共5页Research of Soil and Water Conservation

摘　　要：作者运用１５Ｎ同位素标记手段，结合田间氨挥发直接测定技术，对黄土高原半干旱区，旱作春麦农田氮素运移现状进行了系统地研究；指出化肥氮素的高挥发，高残留，高不明途径损失和低利用率构成了该区旱作农田氮素“三高一低”的运移特征；并对改善氮素运移，提高氮肥利用率的途径进行了探讨。With the 15 N isotopic tracing and the direct testing of NH3 volatilization in field micro-pot test, the authors have made systematic studies on the nitrogrn transport in spring wheat field in the current application methods in dryland of semi-arid loess plateau and advanced the characteristic of '3 higher and 1 lower' of nitrogen transport in crop period of duration: higher volatilization, higher remainder in soil, higher loss of non-conclusive ways and lower utilization rate; and discussed the ways of improving the nitrogen transport and increasing the nitrogen fertilizer utilization rate.

关 键 词：旱地农田 氮素运移 春小麦 

分 类 号：S512.1[农业科学—作物学] S158.3