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土壤碳库变化对于全球温室效应、全球碳循环有重大的影响。基于新近完成的1:250 000多目标地球化学调查及相关研究成果,运用地理信息系统软件ARCGIS 9.2、统计软件SPSS13.0,对长江三角洲地区0~20、0~100、0~180 cm深度土壤有机碳密度及储量作出实测统计。结果表明:长江三角洲地区0~20 cm土壤有机碳库储量为238.65 Tg,有机碳密度为3.28±0.92 kg/m2,各类型土壤有机碳密度均值介于2.63~3.57 kg/m2;0~100cm土壤有机碳库储量为822.76 Tg,有机碳密度为11.30±3.48 kg/m2,各类型土壤有机碳密度均值介于9.35~11.94 kg/m2;0~180 cm土壤有机碳库储量为1 245.72 Tg,有机碳密度为17.11±7.04 kg/m2,各类型土壤有机碳密度均值介于14.27~18.00 kg/m2。与第二次土壤普查比较,全区0~20、0~100cm土壤有机碳密度均值都表现为上升趋势,有机碳库储量增加,土壤表现为碳汇功能。提供了新的土壤碳库实测统计信息,为研究中国区域土壤碳固定潜力、深入全面理解区域碳循环提供基准数据。
Changes in soil carbon pool have a significant impact on the global warming and the global carbon cycle. Based on the newly completed 1: 250 000 multi-target geochemical survey and related research results, using the GIS software ARCGIS 9.2 and statistical software SPSS13.0, the soil depths of 0-20, 0-100 and 0-180 cm in the Yangtze River Delta Organic carbon density and reserves made an actual statistics. The results showed that the organic carbon storage in the 0 ~ 20 cm soil layer in the Yangtze River Delta was 238.65 Tg and the organic carbon density was 3.28 ± 0.92 kg / m2. The mean values of organic carbon in all soil types ranged from 2.63 to 3.57 kg / m2. The organic carbon storage is 822.76 Tg, the organic carbon density is 11.30 ± 3.48 kg / m2, the mean value of organic carbon density is 9.35 ~ 11.94 kg / m2, and the organic carbon storage in 0 ~ 180 cm soil is 1 245.72 Tg. The carbon density was 17.11 ± 7.04 kg / m2, and the mean value of organic carbon density was 14.27 ~ 18.00 kg / m2 in all types of soils. Compared with the second soil survey, the mean values of soil organic carbon in 0 ~ 20 and 0 ~ 100cm showed an upward trend, and the reserves of organic carbon increased and the soil showed carbon sinks. It provided a new statistical data of soil carbon pool and provided the benchmark data for studying the carbon fixation potential of soil in China and thoroughly understanding the regional carbon cycle.