农业资源与环境学报2017，Vol.34Issue(1)：47-53,7.DOI:10.13254/j.jare.2016.0226
施用石灰与钙蒙脱石对酸性土壤硝化动力学过程的影响
Effects of Applying Lime and Calcium Montmorillonite on Nitrification Dynamics in Acidic Soil
摘要
Abstract
Soil acidification is known as a natural and slow process along with clay mineral weathering. In recent years however, with inten-sive soil utilization in agriculture, soil acidification has increased dramatically and nitrification of ammonium nitrogen fertilizer is one of the main contributors to soil acidification. Lime application is the traditional practice to improve acidic soils but it often makes the soil acidic a-gain leading to soil compaction in most cases. Montmorillonite is the main clay mineral component of alkaline or neutral soils, more so it is known to undergo further weathering processes during soil acidification. The laboratory-based incubations were used in this study, and nitri-fication was measured while kinetic curves were fitted to check the effects of decreasing soil acidity by lime(Ca-OH)and montmorillonite (Ca-M)on nitrification of the acidic soil. The results showed that significant nitrification was observed both in Ca-OH and Ca-M treatments, and the nitrification process was fitted in the first-order kinetic model, NNO3=N0+Np(1-exp(-k1t))(P<0.001). The net nitrification rate of Ca-OH treatment(3.429 mg·kg-1·d-1)was significantly higher than that of Ca-M treatment(2.381 mg·kg-1·d-1). The potential nitrifi-cation rate(V p)were 6.42, 8.58 mg N·kg-1·d-1 at pH 5.7 and 6.2 respectively, and the average nitrification rate(V a)of Ca-OH treatment were 2.71, 3.88 mg N·kg-1·d-1 respectively, which were significantly greater than those of Ca-M treatment(Vp were 3.40, 4.56 mg N·kg-1·d-1 and V a were 2.36, 3.04 mg N·kg-1·d-1 at pH 5.7 and 6.2 respectively). Therefore the net nitrification rate, potential nitrification rate(V p) <br> and average nitrification rate(Va)of Ca-OH treatment were significantly higher than that of Ca-M treatment, suggesting that the possibili-ty and degree of soil reacidification by using lime to improve acidic soil is greater than using calcium montmorillonite. This study will provide a new reference for the improvement of acid soils.关键词
土壤酸化/净硝化速率/酸性土壤改良Key words
soil acidification/net nitrification rates/acidic soil improvement分类
农业科技引用本文复制引用
王梅,蒋先军..施用石灰与钙蒙脱石对酸性土壤硝化动力学过程的影响[J].农业资源与环境学报,2017,34(1):47-53,7.基金项目
国家自然科学基金项目 （）
