中国生态农业学报2012，Vol.20Issue(7)：861-866,6.DOI:10.3724/SP.J.1011.2012.00861
温度和水分对华中地区菜地土壤氮素矿化的影响
Influence of temperature and moisture on nitrogen mineralization in vegetable fields of central China
摘要
Abstract
The processes of nitrogen (N) mineralization was determined in order to establish reasonable N application in vegetable fields in central China. The study researched the influence of temperature and water on N mineralization in two typical vegetable soils (yellow-brown and fluvo-aquic soils) in an indoor cultivation experiment. The results indicated that mineralization and am-monification rates in yellow-brown soils increased with increasing temperature. While nitrification rate at 15% and 25% water contents increased with increasing temperature, it decreased with increasing temperature at 35% water content. At 15% water content, mineralization rate of fluvo-aquic soil increased with increasing temperature. At 25% and 35% water contents, however, mineralization rate initially increased and then decreased. Nitrification rate in fluvo-aquic soil increased with increasing temperature at 15% and 35% water content At 25% water content, however, it initially increased then decreased. Ammonification rate generally decreased with increasing temperature. At 25% water content and 35 ℃, mineralization rate in yellow-brown soil was 34.9 mg·kg-1. Also at 25% water content and 25℃, mineralization in the same soil was 63.9 mg·kg-1. Under different temperature conditions, mineralization rate of fluvo-aquic soil was higher than that of yellow-brown soil. While ammonification rate of yellow-brown soil increased with increasing water content, the reverse was true for nitrification rate. The maximum mineralization rate was at 25% water content. Variations in ammonification, nitrification and mineralization rate with water content in fluvo-aquic soil were not so evident. It was noted that the critical moisture content for microbial activity in yellow-brown soil was 25%, and that in fluvo-aquic soil was not evident. The functional relationship of nitrogen mineralization rate with water content and temperature condition in yellow-brown soil was more significant than that in fluvo-aquic soil.关键词
潮土/黄棕壤/矿化速率/硝化速率/氨化速率/含水量/温度Key words
Fluvo-aquic soil, Yellow-brown soil, Mineralization rate, Nitrification rate, Ammonification rate, Soil moisture, Temperature分类
农业科技引用本文复制引用
赵长盛,胡承孝,孙学成,黄魏..温度和水分对华中地区菜地土壤氮素矿化的影响[J].中国生态农业学报,2012,20(7):861-866,6.基金项目
农业部“948”项目(2003-z54,2008-Z25)资助 （2003-z54,2008-Z25）
