| 摘要: |
| 【目的】研究陕西省合阳县1983－2005年土壤有机碳密度及储量的变化。【方法】以陕西省第一次和第二次土壤普查数据为主要资料，运用GIS技术对合阳县1983和2005年的土壤有机碳密度及储量进行了估算，并根据估算结果分析了不同类型土壤有机碳密度和储量的变化及有机碳密度的空间分布特征。【结果】1983－2005年，陕西合阳县相同类型土壤的有机碳密度有所上升，不同土壤类型有机碳密度差异较大。与1983年相比，2005年不同类型土壤的有机碳密度均有所提高，其中水稻土的有机碳密度增加幅度最高，为2.32 kg/m2，而红土、褐土和黄土性土的有机碳密度变化较小；土壤有机碳储量涨幅明显，由3 757.87×106 kg(1983年)增加到了5 582.00×106 kg（2005年）。合阳县土壤有机碳密度的整体空间格局变化很大，1983年合阳县的有机碳密度为0.71～4.65 kg/m2，2005年为3.05～7.66 kg/m2。与1983年相比，2005年合阳县土壤有机碳密度整体有所提升且变化较为剧烈，其最小值不断提高，最大值也有一定增长。【结论】1983－2005年，由于多种因素的综合影响，合阳县土壤碳汇作用加强，土壤有机碳密度及储量变化明显。 |
| 关键词: 土壤有机碳密度 有机碳储量 地理信息系统 陕西省合阳县 |
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| GIS based variations of density and storage of soil organic carbon in county level |
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| Abstract: |
| 【Objective】This research focused on the variations of the density and storage of soil organic carbon in Heyang county,Shaanxi Province.【Method】Based on GIS technology and data from the first and the second soil survey in Shaanxi Province,Heyang county was selected,and the soil organic carbon density and storage in 1983 and 2005 were estimated.According to the estimation results,the distribution characteristics of soil organic carbon density and the changes of organic carbon storage of different soil groups were analyzed.【Result】From 1983 to 2005,organic carbon densities of same soil groups increased,and that of different soil groups had large differences.Organic carbon densities of different soil groups improved from 1983 to 2005.Paddy soil had the highest growth rate of 2.32 kg/m2,while the variation rates of red soil,cinnamon soil and cultivated loess soil were lower.Storage of soil organic carbon increased significantly from 3 757.87×106 kg to 5 582.00×106 kg.The overall spatial pattern of the soil organic carbon density in Heyang varied greatly from 1983 to 2005.Distribution rates of organic carbon density in 1983 and 2005 were 0.71-4.65 and 3.05-7.66 kg/m2,respectively.Soil organic carbon densities improved from 1983 to 2005 and the change was dramatic.The minimum of organic carbon density continuously improved,and the maximum grew as well.【Conclusion】From 1983 to 2005,soil carbon sequestration in Heyang county was enhanced and soil organic carbon density and storage changed significantly due to various reasons. |
| Key words: soil organic carbon density soil organic carbon storage Geographic Information System Heyang county of Shaanxi Province |
