莽山土壤有机碳及其空间分布格局

摘要

根据标准样地取样和实验室得出的数据及莽山第二次土壤普查资料，估算莽山土壤有机碳的含量和储量。结果表明，土壤有机碳含量大小顺序为：黄棕壤＞山地黄壤＞红壤＞紫色土。莽山土壤有机碳总储量约为3.436×106 t，各类型土壤碳储量从大到小依次为：山地黄壤＞黄棕壤＞红壤＞紫色土＞草甸土，莽山主要土壤类型有机碳平均密度为195.35 tC·hm-2。莽山不同土壤类型的有机碳平均密度从大到小依次为：草甸土＞黄棕壤＞山地黄壤＞红壤＞紫色土，空间分布在106.85～216.83 tC·hm-2范围内变动。莽山表层土壤(0～20 cm)有机碳密度差异较大，变化范围在41.74～85.67 tC·hm-2之间，面积加权平均值为75.30 tC·hm-2。莽山表层(0～20 cm)土壤有机碳储量为1.493×106 t，占莽山土壤有机碳库总碳储量38.55%。%According to the field plot sampling and the data derived from laboratory and data from the Second Soil Survey of Hunan Province, the soil organic carbon reserves and density were estimated. The results show that the organic carbon contents in different type soils ordered from big to small were as follows:yellow brown>mountain yellow>red>purple soil, the total amount of soil organic carbon of mountain Mangshan was about 3.436×106 t;the carbon stocks in main soil types in the mountain area ranked with the order:mountain yellow>yellow brown soil>red>purple soil>meadow soil, and the average value of carbon densities was 195.35 t·hm-2;the soil organic carbon average densities in Mangshan different soil types were in the order:yellow brown soil>meadow soil>mountain yellow>red>purple soil, the spatial distribution changed in the range of 106.85~216.83 t·hm-2;the topsoil (0~20 cm) organic carbon densities of each soil layers in Mangshan had larger differences, ranging between 41.74~85.67 t·hm-2, and the area weighted average value was 75.30 t·hm-2;the surface layer (0~20 cm) soil organic carbon reserves was 1.493×106 t, accounting for 38.55%of the total carbon stock of the soil organic carbon in Mangshan.