摘要
采用大田试验方法,研究了肥力和管理水平不同,最终产量水平差异也较大的低产田、常规田和高产田整个玉米生长季0-100 cm土壤剖面硝态氮的时空分布特征。结果表明,3个处理由于管理措施和土壤基础地力的差异,土壤水分的时空分布存在明显不同,且由于高产田有机肥以及较高氮肥量的投入,在玉米各个关键生育期0-100 cm土体中的硝态氮累积总量显著高于常规田和低产田。而常规田与低产田相比较,前者0-100 cm土体硝态氮的累积总量可以达到后者的1~3倍。对环境效应的分析结果表明,较高的氮肥投入对于高密度种植条件下实现玉米高产是必要的,但同时也增加了环境污染的风险。
A field experiment was conducted to analyze the distribution of NO-3-N in 0-100 cm soil profile and environmental effect in corn field of different yields caused by the difference of soil fertility and management.The results indicated that soil water content had significant difference among the high-yield and low-yield,and traditional fields.This difference as well as the application of organic and nitrogen fertilizer resulted in higher accumulation rate of 0-100 cm soil NO-3-N in high-yield field than the other two fields.Compared with that in the low-yield field,the accumulation rate of 0-100 cm soil NO-3-N in traditional field was higher by 1 to 3 times because of its higher soil fertility.It was essential for high-yield production to apply enough nitrogen fertilizer,while the risk of environmental pollution was raised.
出处
《水土保持学报》
CSCD
北大核心
2010年第4期162-166,181,共6页
Journal of Soil and Water Conservation
基金
河北省自然基金(D200800034)
国家粮食丰产科技工程河北省子专题基金(2006BAD02A08)
关键词
玉米田
土壤剖面
硝态氮累积
硝态氮分布
corn field
soil profile
NO-3-N accumulation
NO-3-N distribution
