四方湖自然保护区不同土地利用类型表层土壤有机碳含量分析

Analysis of Topsoil Organic Carbon of Different Land use Types in Sifang Lake Natural Reserve

对安徽省四方湖自然保护区内湿地、林地、水产养殖地、耕地及撂荒地5种土地利用类型土壤表层（0～10cm）有机碳的含量进行测定。结果显示：湿地（19．94g／kg）〉林地（10．63g／kg）〉水产养殖地（8．84g，kg）〉耕地（7．29g／kg）〉撂荒地（4．68g／kg）；湿地土壤表层有机碳含量极显著高于其它土地利用类型（P〈0．01），湿地、林地土壤表层有机碳含量显著高于耕地与撂荒地（P〈0．5）；耕地土壤表层有机碳含量显著高于撂荒地（P〈0．5）；湿地土壤袁层有机碳含量变异系数较小；受人为干扰强烈的水产养殖地和撂荒地土壤表层有机碳含量变异系数相对较高。

In Sifang Lake Natural Reserve, the content of topsoil soil organic carbon（SOC） in five land use types, including wetland, woodland, aquaculture land, cultivated land, abandoned land, were measured.Results revealed： the surface soil （0~10cm） SOC content, in the order of wetland （19.94g/kg） 〉woodland （10.63g/kg）〉 aquaculture land （8.84g/kg） 〉cultivated land （7.29g/kg）〉 abandoned land （4.68g/kg）, showed the significant dif- ference（P〈0.01） between wetland and other land use types.Wetland and woodland have the higher SOC content （P〈0.05） than cultivated land and abandoned land.Cultivated land has higher SOC content（P〈0.05） than aban- doned land.The SOC content of wetland topsoil has the small variation coefficient, but aquaculture land and abandoned land have higher SOC variation coefficient because of human caused disturbance.