论文部分内容阅读
在2007年5月到2008年1月期间,供试土壤为红壤及坡面坡度为15°条件下,利用定位观测数据,探讨了天然降雨条件下浅沟侵蚀小区土壤水分季节变化特征,分析了降雨、土壤质地、等高绿篱、浅沟地形等四个因素对土壤水分动态变化的影响。结果表明,小区坡面0-45 cm土层平均土壤水分含量季节变化规律基本与降水变化一致,降水是影响浅沟坡面土壤水分变化的主要原因;绿篱对浅沟坡面土壤水分的影响因存在季节性的差异,雨季等高绿篱措施对提高浅沟坡面0-45 cm土层含水量作用显著,旱季则相反;土壤质地和浅沟微地形也是影响土壤水分变化的重要因素,但其影响都不如降雨和绿篱的影响显著,种植绿篱有利于保持坡面水分。
During the period from May 2007 to January 2008, the soil samples were red soil and slope gradient was 15 °. Using the observed data, the seasonal variation of soil moisture in shallow ditch erosion area under natural rainfall was discussed. Rainfall, soil texture, contour hedge, shallow trench topography and other four factors on the dynamic changes of soil moisture. The results showed that the seasonal variation of average soil water content in the 0-45 cm layer was basically consistent with the change of precipitation, and precipitation was the main factor affecting the variation of soil moisture on shallow slope. The influence of hedgerows on soil moisture There are seasonal differences. The hedgerow hedgerows during the rainy season have a significant effect on increasing the water content of 0-45 cm soil layer in the shallow ditch, but the opposite in the dry season. Soil texture and shallow ditch microtopography are also important factors affecting the soil moisture change. However, The impact is not as significant as the effects of rainfall and hedges, planting hedge is conducive to maintaining the slope water.