黄土坡地耕作侵蚀对土壤养分影响的研究  

Effects of Tillage Erosion on Soil Nutrients in Loess Sloping Land of China

作　　者：王占礼[1] 邵明安[1] 

机构地区：[1]西北农林科技大学,中国科学院水利部水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室

出　　处：《农业工程学报》2002年第6期63-67,共5页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家自然科学基金 (49871 0 51 );黄土高原土壤侵蚀与旱地农业国家重点实验室基金 (0 2 - B0 0 4 );陕西省人事厅留学基金;中国科学院知识创新工程项目资助

摘　　要：通过地形测量、铯 - 13 7示踪、土壤性质分析及重复耕作的方法对黄土坡地耕作侵蚀对土壤养分的影响进行了研究 ,结果表明 :全 N、碱解 N及有机质含量随投影坡长的变化可用抛物线描述 ,有效 P及速效 K的变化可用幂函数描述 ;全N、碱解 N、速效 K含量与耕作侵蚀的关系可用线性方程描述 ,有效 P含量的关系可用三次多项式描述 ;耕作侵蚀对全 N、碱解 N、有效 P及速效 K含量的贡献率分别为 16.47%、2 .69%、48.85 %及 15 .3 0 % ;由于耕作侵蚀 ,15年内碱解 N、速效K、有机质及阳离子代换量的含量将在耕作侵蚀区呈减少趋势 。The effects of tillage erosion on soil nutrients in Loess sloping land of China were studied with topography measurement, 137Cs tracing, analysis of soil properties, and repeated tillage. The results show that spatial variations of total nitrogen, available nitrogen and organic matter with horizontal slope length can be described with parabola, and that spatial variations of available phosphorus and available potassium with horizontal slope length can be described with power function. Relationships between tillage erosion and total nitrogen, available nitrogen and available potassium can be described with linear equation, and the relationship between tillage erosion and available phosphorus can be described with cubic polynomial. Contributions of tillage erosion to total nitrogen, available nitrogen, available phosphorus and available potassium are 16.47%, 2.69%, 48.85% and 15.30%, respectively. With tillage erosion, the available nitrogen, available potassium, organic matter and cation exchanging capacity will decrease the tillage erosion area and increase tillage deposition area of hillslope in 15 years.

关 键 词：黄土坡地 耕作侵蚀 土壤养分 土壤侵蚀 

分 类 号：S158[农业科学—土壤学] S157.1[农业科学—农业基础科学]