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旱地农田生态系统氮肥利用率的评价
引用本文:李世清,李生秀.旱地农田生态系统氮肥利用率的评价[J].中国农业科学,2000,33(1):76-81.
作者姓名:李世清  李生秀
作者单位:西北农业大学资源与环境科学系!陕西杨凌712100
基金项目:国家自然科学基金!( 39770 4 2 5,39970 1 5 1和 39970 4 5 9)
摘    要: 在杨凌中等肥力红油土上进行的连续4季大田试验表明,旱地农田生态系统中氮肥不仅在第1季作物产量和吸氮量上表现出突出的效果,而且还有较长的后效,可持续到第4季作物上。当季氮肥利用率平均31.7%,4季叠加利用率63.3%,后者是前者的2倍,施氮量愈高,叠加利用率与当季利用率间的差别更大。这表明仅用当季作物氮肥肥效难以客观可靠评价氮肥利用率,应当把后效考虑在内。

关 键 词:旱地农业  农田生态系统  氮肥利用率  后效

Estimation of Nitrogen Fertilizer Use Efficiency in Dryland Agroecosystem
Li Shiqing,Li Shengxiu.Estimation of Nitrogen Fertilizer Use Efficiency in Dryland Agroecosystem[J].Scientia Agricultura Sinica,2000,33(1):76-81.
Authors:Li Shiqing  Li Shengxiu
Abstract:A field trial was carried out to study the nitrogen fertilizer recovery by four crops in sussession in manual loess soil in Yangling. The results show that the nitrogen fertilizer had the significant effects on the first crop and long residual effects,even on the fouth crop. The average apparent nitrogen N fertilizer recovery by the first crop was 31.7% , and the accumulative N recovery by the 4 crops was high as 62.3%,and the latter was double as the former. It is quite clear that the nitrogen fertilizer recovery by the first crop was not reliable for estimating the N fertilizer use efficiency unless the residual effect of N fertilizer was included.
Keywords:Dry farming  Ecological system of farmland  Nitrogen fertilizer recovery  Residual effect
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