农业环境科学学报Issue(10)：1958-1964,7.DOI:10.11654/jaes.2015.10.017
长期施肥对水稻土有机氮组分及氮素矿化特性的影响
Effects of Long-term Different Fertilization on Fractions and Mineralization of Organic Nitrogen in Paddy Soils
摘要
Abstract
Applying fertilizers not only improves soil fertility, but may also influence nitrogen transformation in soil. Here the effects of long-term(20 years)different fertilization on total nitrogen(N), organic N components and organic N mineralization in paddy soils were studied at three experimental sites(Xinhua, Ningxiang and Taojiang)in Hunan Province. Fertilization included no fertilizer(CK), chemical fertil-izers(NPK), chemical fertilizers plus medium and high amounts of pig manure(MM+NPK and HM+NPK), and chemical fertilizers plus in-corporated straw(Str.+NPK). Compared with CK, chemical fertilizers alone did not consistently influence soil total N, alkali-hydrolyzable N and microbial biomass N, but chemical fertilizers plus organic materials(MM+NPK, HM+NPK and Str.+NPK)significantly increased these soil N content in all three experimental sites. In general, the proportions of amino acid N and amino sugar N to total N were improved by long-term fertilization. However, the responses of organic N fractions to fertilization varied in different experimental sites, which may be at-tributed to the differences in soil properties. Significant positive correlation was observed between hydrolyzable N content and potentially mineralizable N. In all three experiment sites, chemical fertilizer plus organic materials showed a higher potentially mineralizable N than chemical fertilizers alone. In conclusion, soil properties influence the responses of soil organic nitrogen fractions to fertilization, and com-bined applications of organic and chemical fertilizers show higher soil nitrogen supplying potential than chemical fertilizers alone.关键词
水稻土/长期施肥/有机氮组分/土壤氮矿化/湖南Key words
paddy soil/long-term fertilization experiment/organic nitrogen fraction/soil nitrogen mineralization/Hunan Province分类
农业科技引用本文复制引用
伍玉鹏,邓婵娟,姜炎彬,胡荣桂..长期施肥对水稻土有机氮组分及氮素矿化特性的影响[J].农业环境科学学报,2015,(10):1958-1964,7.基金项目
国家自然科学基金（41171212）；“十二五”国家科技支撑计划项目 （）
