土地利用方式对东祁连山土壤表层有机碳的影响

在祁连山东段高寒地区,选取天然草地、退耕自然恢复地、坡耕地和人工草地4种土地利用方式,研究了土地利用方式对土壤表层有机碳含量和有机碳密度的影响.结果表明:在4种土地利用方式中天然草地土壤表层有机碳含量最高,坡耕地和退耕自然恢复地土壤表层有机碳含量较低；土壤表层有机碳密度整体上随着土层加深而逐渐降低,在0～30cm土层土...

Effect of different land use patterns on organic carbon in surface soil in eastern Qilian Mountains

In alpine areas of eastern Qilian Mountains,four land use patterns,such as natural grassland,naturally restored abandoned cropland,slope cropland and sown grassland were selected to study the effect of different land use patterns on the content and density of organic carbon in surface soil.The results showed that the content of organic carbon in surface soil of the natural grassland was the highest,while that of the naturally restored abandoned cropland and slope cropland was the lowest;With the soil depth increased,the density of organic carbon in surface soil gradually reduced;In 0～30 cm soil layer,significant differences existed in the density of organic carbon in surface soil among 4 types of land use patterns(P<0.05),the spatial distribution of the density of organic carbon in surface soil performanced as natural grassland(15.81 kg/m2)>sown grassland(7.56 kg/m2)>slope cropland(6.08 kg/m2)>naturally restorated abandoned cropland(5.48 kg/m2).All these indicated that land use patterns had significant effect on the content and density of organic carbon in surface soil.