科尔沁沙地农牧交错带土地利用方式对土壤特性的影响

Effect of Land Use on Soil Properties in Inter-distributing Area of Farming and Pasturing of Keerqin Sandy Land

以彰武县北部为样区,研究了科尔沁沙地农牧交错带不同土地利用方式对于土壤特性的影响。研究结果表明:草甸碱土草地开垦为旱作农田后,土壤次生盐渍化加重;草甸草地开垦成为水田,则有利于对土壤次生盐渍化的防止和抑制;固沙林地或草地开垦成为农田,在一定的程度和范围会导致土壤养分含量特别是速效养分N含量显著降低,土壤颗粒的粗化(沙化),且这种趋势随着开垦年限的增加而加重。

This paper takes Zhangwu County in Keerqin sandy land as an example to study the effect of land use on soil properties in the inter-distributing area of farming and pasturing. The results showed：serious alkalization occured after alkaline grassland has been shifted into dryland for farming, which results in increase of pH and electric conductivity of the soil. When meadow grassland was converted into paddy field, salinization could be well controlled. After forest land and grassland in aeolian soil were cultivated, soil oligotrophication and desertification would taken place seriously . It will be more serious as the increase of forming years.