中国水土保持科学2013，Vol.11Issue(3)：6-11,6.
渭北旱塬侵蚀退化土壤生产力的恢复与评价
Soil productivity restoration and evaluation of erosion degradation in Weibei Dry Highland
摘要
Abstract
Soil erosion can decline productivity and threat to agricultural production.Therefore,it is a great significance to restore and evaluate the soil productivity.The recovery of soil productivity was studied and evaluated to simulate different degree of erosion of soil productivity,which selected the fertilization and cover the topsoil two recovery measures through artificial stripping of mellow soil.The results showed that:1) soil erosion could deteriorate the physical and chemical properties of soil.Fertilization and covering soil could improve the soil bulk density,porosity,and increase soil organic matter and mass nutrient contents.2) Soil erosion could reduce crop yields by an average of 1.27 percent per l cm mellow soil eroded under no fertilization.Compared with the control treatment,corn yield increased by 0.87％ per lcm mellow soil eroded under fertilization.However,corn yield increased by 0.91％ when covered by lcm mellow soil,but could not completely compensate for the erosion yield losses.3)The value of productivity index under different measures was calculated through soil productivity index model (PI model).The results showed that the value of productivity index under no fertilization was lowest.The average decrease of productivity index value was 2.17％ per 1cm mellow soil eroded under fertilization.The average increase of productivity index value was 1.09％ per 1cm cooked soil eroded compared with no fertilization,while the average increase of productivity index value was 1.29％ per 1 cm mellow soil covered,which indicated that the covering soil was easier than fertilization to improve soil productivity.4) A good positive correlation was found between yield and productivity index by correlation analysis,which indicated that it was feasible to measure soil productivity by productivity index.关键词
土壤侵蚀/土壤生产力/施肥/覆土/生产力恢复/生产力评价Key words
soil erosion / soil productivity / fertilization / covering soil / soil productivity restoration / soil productivity evaluation分类
农业科技引用本文复制引用
成婧,吴光艳,云峰,王健,吴发启..渭北旱塬侵蚀退化土壤生产力的恢复与评价[J].中国水土保持科学,2013,11(3):6-11,6.基金项目
国家自然科学基金"水蚀过程中地表糙度的演化及其侵蚀相应规律研究"(40871133) （40871133）
