保护性耕作农田抗风蚀效应多因素回归分析  

Multi-factor regression analysis of anti-wind erosion effects of conservation tillage farmland

作　　者：孙悦超[1] 麻硕士[2] 陈智[2] 赵永来[1] 苏洁[1] 

机构地区：[1]内蒙古农业大学职业技术学院,包头014109 [2]内蒙古农业大学机电工程学院,呼和浩特010018

出　　处：《农业工程学报》2010年第10期151-155,共5页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家自然科学基金资助项目(40861013)

摘　　要：为定量评价风洞中心风速、留茬高度、植被盖度及交互作用对保护性耕作农田风蚀的影响,按均匀试验设计方案,采用野外风洞原位测试方法,完成了保护性耕作农田抗风蚀效应多因素试验。用偏最小二乘回归(PLSR)理论,建立了保护性耕作农田土壤风蚀模型。分析表明:各因素对输沙率作用的主次顺序依次为:中心风速、植被盖度、留茬高度;对截留率作用的主次顺序依次为:留茬高度、植被盖度、中心风速;各因素对输沙率、截留率交互作用规律相同,由主到次为:留茬高度×植被盖度、中心风速×植被盖度、中心风速×留茬高度。结果证明,保护性耕作农田的抗风蚀机理,不仅受单因素的影响,还与中心风速、留茬高度、植被盖度间的交互作用关系密切。In order to quantitatively evaluate the effects of wind tunnel central speed,stubble height,vegetation coverage and their interaction on wind erosion of conservation tillage farmland,uniform experimental design and wind tunnel testing in-situ field were adopted,and multi-factor experiment of anti-wind erosion effects of conservation tillage farmland was completed.Conservation tillage farmland anti-wind erosion model was established using partial least-squares regression（PLSR） theory.The results showed that effects of each factor on sediment transport rate in proper order were center wind speed,vegetation coverage and stubble height;those on retention rate in proper order were stubble height,vegetation coverage and center wind speed;for both sediment transport rate and retention rate,interaction regulations between factors were same i.e.stubble height × vegetation coverage,center wind speed × vegetation coverage and center wind speed × stubble height based on the order of the main effect standard regression coefficients.The results showed that anti-wind erosion mechanism of conservation tillage farmland was not only affected by single factor,but also closely related with the interactions among central speed,stubble height and vegetation coverage.

关 键 词：侵蚀 风影响 回归分析 原位测试 保护性耕作 交互作用 偏最小二乘法 

分 类 号：S157.4[农业科学—土壤学]