论文部分内容阅读
坝地土壤有明显的层次构型，上轻下粘，存在着相当于作物养分库的富粘层，对耕作和保蓄水肥十分有利。土壤养分贮量随粘粒的增加而提高。坡地土壤无明显层次，养分贮量远低于坝地的中粘层与富粘层，故坝、坡地上层养分差异不大，３０ｃｍ以下坝地远高于坡地。坝地土壤肥力形成以粘粒化过程为主，养分间协调性较好，坡地土壤以有机质积累过程为主，养分相对处于离散状态。坝地粘粒富集层锌的供应容量与强度均较大，生长的黑麦草干物质与养分累积量较多。
The soil in the dam area has obvious gradation configuration, light and sticky, and there is an enrichment layer equivalent to the crop nutrient pool, which is very beneficial to farming and preserving water and fertilizer. Soil nutrient storage increased with the increase of clay. There was no obvious level of soil in the sloping field, and the nutrient storage was much lower than the medium-sticky layer and the viscous layer in the dam area. Therefore, there was not much difference in nutrients in the upper layer of the dam and slope, and the dam area below 30cm was much higher than the slope. The formation of soil fertility in the dam site is dominated by clay granulation process with better coordination among nutrients. The soil is dominated by organic matter accumulation in the slope land and the nutrients are relatively in a discrete state. The supply capacity and intensity of Zinc in the clay accumulation zone in the dam area are relatively large, and the dry matter and nutrient accumulation in the ryegrass growing more.