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土壤碳库是全球土壤碳循环的重要组成部分。研究以第二次土壤普查数据为基础,通过土壤类型法估算了浙江省水稻土有机碳储量并研究了水稻土有机碳密度空间分布情况。结果表明:浙江省水稻土总面积约为18423 km2,有机碳库总量为165.99 Pg,平均1 m有机质密度为8.28 kg m-2。有机碳密度呈现沿海杭嘉湖、宁绍、台州和温州四大水网平原等地区密度高,中部、西部地区密度低的状况。另外,通过比较各个省份的水稻土有机碳密度高低,发现在同样使用全国土壤普查数据与土壤类型法的基础下,数据的缺失与计算方法的细微差异会导致有机碳密度计算结果的差异。
Soil carbon pools are an important part of the global soil carbon cycle. Based on the second soil census data, the study estimated the SOC of Zhejiang paddy soils by soil type method and studied the spatial distribution of SOC in paddy soil. The results showed that the total area of paddy soil in Zhejiang Province was about 18,423 km2, the total organic carbon pool was 165.99 Pg, and the average density of 1 m organic matter was 8.28 kg m-2. The density of organic carbon presents the high density in the areas of Hangzhou-Jiaxing-Huzhou, Ningshao, Taizhou and Wenzhou water networks, and the low density in the central and western regions. In addition, by comparing the density of organic carbon in paddy soils in different provinces, it is found that the slight discrepancy between data loss and calculation method based on the same national soil census data and soil type method results in the difference of organic carbon density calculation results.