带状间作残茬高度抗风蚀效应的测试

The Effect of Stubble Height to Resist Wind Erosion in the Strip Intercropping

通过风蚀风洞试验,针对农田采用带状间作种植时保护性耕作带的防风效应进行了研究。通过改变中心风速以及茬高,分析了保护性耕作带对风速降低的影响程度。试验结果表明:以作物留茬形成保护带可有效降低相邻传统耕作带的风速值,但随着风速的增大,保护性耕作带降低风速的幅度有所减小;留茬越高,对相邻传统耕作带的保护作用越明显;沿地表垂直方向基本上呈现出越接近地表的位置风速降低率越大的规律。为保证其具有一定的防护效应,建议保留残茬高度不低于25cm。

This paper discussed some research about the effect of the conservation tillage strip through the experiments for the wind erosion tunnel.The conservation tillage strip can provide a natural windbreak for the planting strip intercropping.In the meantime this paper also analyzed the effect of the conservation tillage strip to the amount of fluctuation of the wind speed by changing the speed of the wind and the height of the conservation tillage strip.The results showed that： the crop stubble-keeping would reduce the wind speed in the adjacent trational tillage strip as a crop screen.Of course,as well as the wind speed increased,the reaction to decrease the rate of wind speed by the conservation tillage strip would reduce too.Higher the stubble-keeping,the protective effect of the adjacent traditional tillage strip will more obvious.And it appears a regulation that the closer to the surface,the greater decrease of the wind speed.So in order to ensure a certain protective effect,the propositional measure to the stubble-keeping height is 25cm at least.