云南南涧县土壤有机碳储量研究

Study on Soil Organic Carbon Storage in Nanjian County of Yunnan Province

本研究利用土壤类型法,根据中国第二次土壤普查资料中云南南涧县的34个典型土壤剖面的理化性质,估算出土壤有机碳储量。研究结果表明：南涧县土壤有机储量约为33 438 064 t。平均碳密度介于0.76~2.24 g/cm2之间,土壤密度在不同土壤类型间的变化较大,其中红壤（2.24 g/cm2）〉黄棕壤（2.22 g/cm2）〉紫色土（1.94 g/cm2）〉棕壤（1.90 g/cm2）〉冲积土（1.60 g/cm2）〉水稻土（1.50 g/cm2）〉石灰土（0.76 g/cm2）。红壤面积占全县总估算面积的43%,红壤的碳储量占了总储量的46%。南涧县各土类平均土壤有机碳密度均高于全国对应土类的平均碳密度;有机碳储量空间分布呈现出从西到东逐渐减小的趋势。中小尺度土壤有机碳储量研究是提高大尺度区域研究精度的基础。

This study was conducted to estimate the soil organic carbon storage based on China＇s Second General Soil Survey data of the typical physical and chemical properties of 34 soil profiles in Nanjian County by using the soil type method.The research shows that,the average carbon density is between 0.76 g/cm2 and 2.24 g/cm2,the soil density changes a lot in different types of soil,of which red soil（2.24 g/cm2） yellowish brown soil（2.22 g/cm2） purple soil（1.94 g/cm2） brown soil（1.91 g/cm2） alluvial soil（1.60 g/cm2） rice soil（1.50 g/cm2） lime soil（0.76 g/cm2）.The soil organic carbon storage is about 33,438,064 tons in Nanjian County.The red soil area was 43% of the total estimated area of Nanjian County,and the carbon storage in the red soil accounted for 46% of the total storage.The average soil organic carbon density of the every soil type in Nanjian County was higher than that of in the national corresponding average carbon density.The spatial distribution of soil organic carbon storage showed the gradual decrease from west to east part.The research on medium and small-scale soil organic carbon storage was the basis of improving the accuracy of large-scale study.