保护性耕作农田抗风蚀效应多因素回归分析

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。

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

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.