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根据甘肃省第二次土壤普查所得的37个土壤类型、281个典型土壤剖面的理化性质和土壤各类型分布面积,以及1:300万甘肃省纸质土壤图,利用土壤类型法估算了甘肃省土壤有机碳的储量,并借助M ap-G IS软件分析了土壤碳密度的空间分布规律。结果表明:甘肃省土壤有机碳含量约为39.87×108t,占全国储量的4.47%;其中有机碳储量占前5位的土壤类型为亚高山草甸土、高山草甸土、褐土、灰褐土、亚高山草原土,五者之和占全省总储量的39.67%;另外,甘肃省土壤有机碳密度较高,土壤平均碳密度为17.62kg.m-2,高于全国平均水平9.60kg.m-2;泥炭土的有机碳密度最大,高达208.53kg.m-2;粗骨土的碳密度含量最低,为0.73kg.m-2,全省的土壤有机碳密度主要在0~15kg.m-2范围内变动。
Based on the 37 soil types obtained from the Second Soil Survey of Gansu Province, the physical and chemical properties of 281 typical soil profiles, the distribution area of various types of soil, and the paper soil map of 1: 3 million Gansu Provinces, Gansu Province Soil organic carbon reserves, and analyzed the spatial distribution of soil carbon density using M ap-G IS software. The results showed that the soil organic carbon content in Gansu Province was about 39.87 × 108t, accounting for 4.47% of the national total reserves. The soil types with the top 5 organic carbon stocks were subalpine meadow soil, alpine meadow soil, cinnamon soil, Soil and sub-alpine grassland, the sum of the five accounted for 39.67% of the total reserves of the province; In addition, Gansu Province soil organic carbon density is higher, the average soil carbon density of 17.62kg.m-2, higher than the national average of 9.60kg .M-2. Peat soil had the highest organic carbon density of 208.53kg.m-2. The lowest density of coarse-grained soil was 0.73kg.m-2. The density of soil organic carbon in the province was mainly 0-15kg .m-2 range of changes.