中国农业科学2013，Vol.46Issue(12)：2492-2500,9.DOI:10.3864/j.issn.0578-1752.2013.12.010
不同耕作方式对紫色土侵蚀及磷素流失的影响
Effects of Tillage Practices on Soil Erosion and Phosphorus Loss in Sloping Cropland of Purple Soil
摘要
Abstract
[Objective] The characteristics of soil erosion and phosphorus losses caused by rainfall on the scattered sloping cropland in purple soil during the maize maturity were studied in order to provide a theoretical evidence for the prediction,assessment and control of soil nutrient loss and coordinate land management to improve the ecological environment in purple soil area.[Method] The simulated rainfall experiments and runoff plot experiments were employed to investigate the characteristics of surface erosion,subsurface runoff and phosphorus loss among different tillage practices(flat planting,longitudinal ridge and cross ridge) during the maize maturity.Rainfall intensity is 1.7 mm·min 1,rainfall duration for 40 mins.[Result] Tillage practices had no significant influence on the phosphorus concentration in surface runoff,longitudinal ridge produced maximal amount of surface erosion and surface phosphorus loss.Meanwhile,it produced minimal subsurface runoff and subsurface phosphorus loss.Conversely,cross ridge produced minimal surface erosion and surface phosphorus loss,but the subsurface runoff was extremely serious.Although,the total of subsurface runoff were less compared with surface runoff under every tillage practice,but the phosphorus content was very high,the total phosphorus concentration all reached 0.2 mg·L1,which were about 1.3 times higher than the surface runoff.[Conclusion] On the scattered sloping cropland,longitudinal ridges should not be adopted in normal agricultural production.Cross ridge was proven to be highly effective in control of both soil erosion and P losses,but attention needs to be paid to ridge repairing and protecting.In the whole process of erosion,the surface runoff was a large portion of the total runoff and phosphorus losses,and phosphorus loss in runoff was mainly in a form of dissolved phosphorus.关键词
玉米/耕作方式/紫色土/土壤侵蚀/磷素流失Key words
corn/ tillage practice/ purple soil/ soil erosion/ phosphorus loss引用本文复制引用
何晓玲,郑子成,李廷轩..不同耕作方式对紫色土侵蚀及磷素流失的影响[J].中国农业科学,2013,46(12):2492-2500,9.基金项目
国家自然科学基金资助项目(40901138,41271307)、四川省学术和技术带头人培养资金资助项目(2012)、四川省科技厅应用基础项目(2010JY0083)、黄土高原土壤侵蚀与旱地农业国家重点实验室(10501-283) （40901138,41271307）
