科尔沁沙地不同土地利用状态下表土粒度变异研究

Study on Partical Size Variation of Topsoil under Different Land Use in Horqin Sandy Land

土壤粒度分布对土壤风蚀具有直接的影响作用,研究不同土地类型下的表土粒度特征及可蚀性粒度状况,对于了解不同尺度上的土壤侵蚀、土壤利用变化具有重要的参考价值。本文对科尔沁沙地沙化地区的不同利用状态下的耕地、草地的粒度特征进行了比较研究,结果表明:不同土地利用状态的土地类型间表土的粒度性质存在显著差异,退化耕地、退化草原、围封草原等曾经受到过或正在受着人类强烈影响的土地类型其表土表现出明显的粗化现象,即表土易蚀粒径颗粒物含量的减少和难蚀粒径颗粒物的增多。说明人类不合理的土地利用叠加在土壤风蚀之上可以明显的加大土壤表层粒度分布的差异。

Soil particle size distribution has a direct effect to the soil erosion,it has a great reference value through learning about different scales of soil erosion,soil-use change by studying Particle size characteristics and Erodibility size situation of topsoil with Different types of land . In this paper,we had a comparative study for the Horqin sandy deserts of the different regions of the state of arable land,grassland particle size characteristics ,the result showed :there was a significant difference between the state of the size among different Land-use,the phenomenon of the rough has been shown due to a strong impact on human land topsoil,such as degradation of arable land,grassland degradation,enclosed grasslands,that is the contents of Topsoil erosion-size particles was less and hard-corrosion particle the was more . It was obvious that the size distribution of the topsoil will be Increased if we use land unreasonable on windy soil erosion.