淮河流域王蚌区间土壤有机碳分布特征研究

Characteristics of Soil Organic Carbon Distribution in the Wangjiaba-BengbuInterval of the Huaihe River Basin

为了探究提升土壤固碳增汇能力,以淮河流域王蚌区间为研究对象,通过对不同类型和不同深度的土壤进行分析,使用稳定碳同位素(^(13)C)和SIAR混合模型计算研究区土壤和底泥沉积物有机碳来源情况及各来源贡献率。研究表明:林地土壤的碳同位素平均值最大(-2.61%),河漫滩土壤的碳同位素平均值最小(-2.73%)。农田耕地土壤对沉积物有机碳的贡献率最大;草地土壤对沉积物有机碳的贡献率最小;随着土壤深度的增加,土壤碳同位素值呈增大趋势,土壤对沉积物有机碳的贡献率呈减小趋势。

To investigate the enhancement of soil carbon sequestration and sink capacity,the Wangjiaba-Bengbu interval of the Huaihe River basin was used as the study object,and the organic carbon sources of soil and substrate sediments in the study area and the contribution of each source were calculated by analyzing different types and depths of soils with a hybrid model of stable carbon isotope(^(13)C)and SIAR.The research result showed that the mean carbon isotope value was the largest for forest soils(-2.61%)and the smallest for riverine soils(-2.73%).The contribution of farmland-cultivated soil to sediment organic carbon was the largest,and the contribution of grassland soil to sediment organic carbon was the smallest.With the increase of soil depth,the soil carbon isotope value showed an increasing trend,and the contribution of soil to sediment organic carbon showed a decreasing trend.