红壤丘陵坡地不同利用方式的土壤N矿化特征  

Nitrogen Mineralization of Upland Red Soil under Different Land Use Patterns

作　　者：郝金菊[1] 陈钦华[1] 周卫军[1] 于乾文 王凯荣[3] 刘鑫[3] 

机构地区：[1]湖南农业大学资源环境学院,湖南长沙410128 [2]湖南省临澧县农业局,湖南临澧415006 [3]中国科学院亚热带农业生态研究所,湖南长沙410125

出　　处：《土壤通报》2007年第1期29-33,共5页Chinese Journal of Soil Science

基　　金：中国科学院知识创新工程项目(KZCX2-407);湖南农业大学人才引进基金项目(04YJ10)资助

摘　　要：以坡地不同利用方式定位试验为研究对象，应用间歇淋洗培养方法和计算机模拟模型，求得土壤氮索矿化参数，并探讨了速效氮、氦索矿化势（No）、全氮、有机质组分之间的关系。结果表明，在35℃条件下进行好气培养，一级动力学方程能够很好的拟合试验数据，模拟方程和模拟参数均达到极显著水平。经过8年的不同经营管理，退化利用方式土壤氮的矿化势最低，变动在34.7～39.2mg kg^-1之间，早农利用方式土壤氮矿化势最高，变动在47．8～53．9mg kg^-1之间，园地利用方式（落叶果、常绿果、茶园）的土壤氮素矿化势在46．2～49．5mg kg^-1之间；氮索矿化势、土壤全氮、土壤有机质、土壤活性有机质、土壤易氧化有机质之间的相关分析表明，各指标之间均达到显著或极显著正相关，氮索矿化势可以作为红壤丘陵区坡地开发利用过程中土壤供氮强度的指标之一。Based on a long - term experiment of different land use patterns in upland red soil, the parameters of soil N mineralization were achieved by the method of leaching incubation at intervals and the Prism 3.2 simulation model. , The relationship between nitrogen mineralization potential （No）, available nitrogen （NA）, total nitrogen （NT） and fractions of soil organic matter were studied at Taoyuan Station of Agricultural System Research and Observation of Chinese Academy of Sciences. The results showed that the first order dynamic model could primely fit the experimental data under aerobic incubation at 35℃. Soil No of the degradation pattern treatment was the lowest and varied from 34.7 to 39.2mg kg^-1, while that of the upland crop pattern treatment was the greatest and varied from 47.8 to 53.9mg kg^-1. The statistic results indicated that the significant positive correlation between No, NA, NT, soil organic matter （SOM）, active organic matter （AOM）, and readily oxidizable organic matter （ROM） was observed. The findings suggest that soil No could be used as an index of soil N supplying capability under land exploitation of the hilly red soil region of the Southern China.

关 键 词：红壤坡地 土地利用方式 氮素矿化势(No) 氮索供应 有机质 

分 类 号：S153[农业科学—土壤学]