论文部分内容阅读
分别以开垦年限为8a、30a、50a的典型黑土耕地和未开垦的天然次生林林地表层土壤为对象,采用人工模拟降雨的方法,对比分析了不同开垦年限土壤的溅蚀规律及溅蚀过程中团聚体分选、分布特征,并通过析因分析研究了开垦对黑土溅蚀的影响机制.结果表明:不同开垦年限黑土耕地土壤的溅蚀量明显高于未开垦次生林林地土壤,且随开垦年限的延长而增加,变化范围为0.95～7.06g.cm-1;土壤溅蚀量与溅蚀距离表现出紧密的指数函数关系,而且随着水平空间距离的增加,小粒级水稳性团聚体比例逐渐增加;溅蚀对黑土团聚体产生富集作用与损耗作用的临界粒级为1.0mm;粒级>2mm、<0.25mm水稳性团聚体及有机质含量是典型黑土土壤溅蚀量及其变化特征的主要影响因子.
Taking the typical black soil cultivated land with the reclamation years of 8a, 30a and 50a and the uncultivated natural secondary forest as the object, artificial rainfall was used to analyze the rules of soil erosion and the agglomeration The results showed that the amount of soil erosion in cultivated black soil was significantly higher than that in uncultivated secondary forest with different reclamation years and was affected by reclamation years And the range of variation is 0.95 ~ 7.06g.cm-1. The amount of sputtered soil erosion and the erosion distance show a close exponential function, and with the increase of horizontal spatial distance, the proportion of small-sized water-stable aggregates gradually increases The critical particle size of splashing erosion was 1.0mm for the enrichment and depletion of black soil aggregates. The size of water-stable aggregates and organic matter with size of 2mm and <0.25mm was the typical amount of soil erosion and its variation in black soil The main impact factor.