紫色土丘陵区坡面土壤有机碳含量及储量分布特征

发布时间：2018-06-16 01:10

本文选题：紫色土 + 坡耕地　；参考：《水土保持学报》2017年03期

【摘要】：为探明坡耕地土壤有机碳空间分布特征,对紫色土丘陵区坡耕地不同部位土壤有机碳及活性有机碳顺坡和深度分布进行分析。结果表明:坡耕地上坡土层深度仅为22.3cm,中坡和下坡土层深度约为上坡的2.09倍和3.30倍;与上坡比较,中坡和下坡土壤容重下降了0.2和0.04,土壤孔隙度增加了19.82%与3.83%。沿坡从上向下土壤有机碳及活性有机碳储量显著增加,下坡土壤有机碳及活性有机碳储量比上坡和中坡分别增加了674.74%,104.09%和958.51%,267.75%;不同部位土壤有机碳及活性有机碳含量随土层深度增加呈降低趋势,中坡和下坡土壤有机碳及活性有机碳含量的深度分布满足Y=alnX+b对数方程,上坡不符合该方程。坡耕地土壤有机碳与其活性有机碳含量呈极显著正相关。土壤沿坡耕地重新分配影响有机碳空间分布格局。
[Abstract]:In order to find out the spatial distribution of soil organic carbon (SOC) in sloping farmland, the distribution of soil organic carbon (SOC) and active organic carbon (AOC) in different parts of sloping farmland in purple hilly region were analyzed. The results showed that the depth of soil layer was only 22.3 cm, the depth of middle and lower slope was 2.09 times and 3.30 times of that of upper slope, the bulk density of middle and lower slope soil decreased 0.2 and 0.04, and the soil porosity increased 19.82% and 3.83%. Soil organic carbon and active organic carbon reserves increased significantly from top to bottom along the slope. The soil organic carbon and active organic carbon storage in downhill soil increased by 674.74% and 958.51%, respectively, compared with the upper slope and middle slope, and the contents of soil organic carbon and active organic carbon in different parts of the soil decreased with the increase of soil depth. The depth distribution of soil organic carbon and active organic carbon content in the middle and lower slopes satisfied the Yaln X b logarithm equation, but the upper slope did not conform to this equation. Soil organic carbon in sloping farmland was positively correlated with its active organic carbon content. Soil redistribution along sloping farmland affected the spatial distribution of organic carbon.
【作者单位】：四川省农业科学院土壤肥料研究所;中国科学院水利部成都山地灾害与环境研究所;
【基金】：国家重点研发计划项目(2016YFE0112700,2016YFD0300900) 国家公益性行业(农业)科研专项(201203030) 中国科学院西部之光项目(Y4R2170170)
【分类号】：S153.6

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