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利用四川省成都经济区多目标区域地球化学调查获得的土壤有机碳含量数据,探讨了成都经济区不同地貌景观区土壤有机碳的分布特征。山区表层土壤有机碳含量(SOC)最高(22 g/kg左右),较平原区、丘陵区高一倍以上,丘陵区最低(9.49 g/kg)。成都平原区和东部丘陵区深层土壤碳含量相差不大,且均低于研究区深层土壤碳含量均值(6.99 g/kg)。利用指数模型对单位土壤平均碳量(USCATOC)、有机碳储量(USCATOC,h)、有机碳丰度指数(R)进行了估算。结果表明:各地貌单元土壤碳含量、单位土壤平均碳量、有机碳储量、有机碳丰度指数(R)分布具有山区高于平原区、丘陵区最低的一致性特征。龙门山区、西南山区面积约占全区的42%,土壤有机碳储量约占全区的59%;成都平原区、丘陵区面积占58%,土壤有机碳储量约占全区的41%。单位土壤平均碳量、有机碳储量在不同地貌单元中分布的差异主要与不同地貌单元的土壤有机碳含量有关,此外还可能与成土母质、植被发育情况、土地利用方式有关。
Based on the data of soil organic carbon obtained from multi-target regional geochemical survey in Chengdu Economic Zone of Sichuan Province, the distribution characteristics of soil organic carbon in different landscape areas in Chengdu Economic Zone were discussed. The highest soil organic carbon (SOC) in the mountainous area was about 22 g / kg, which was more than double that in the plain and hilly areas and the lowest in the hilly areas (9.49 g / kg). Soil carbon content in the deep layer of the plain and hilly areas in Chengdu is similar to that of the deep layer in the study area, and it is lower than the average soil carbon content (6.99 g / kg) in the deep area of the study area. The average soil organic carbon (USCATOC), organic carbon stocks (USCATOC, h) and organic carbon abundance index (R) were estimated by exponential model. The results showed that the content of soil carbon, unit of soil average carbon content, organic carbon storage and organic carbon abundance index (R) distribution of each unit in landscape units had the lowest consistent characteristics in mountainous area than in plain and hilly areas. Longmen Mountain, Southwest mountainous area accounts for about 42% of the region, soil organic carbon reserves account for about 59% of the region; Chengdu plain, hilly area of 58%, soil organic carbon storage accounts for about 41% of the region. The difference of soil carbon content and organic carbon storage in different geomorphic units per unit area was mainly related to soil organic carbon content in different geomorphic units. In addition, it may be related to soil parent material, vegetation development and land use patterns.