浙江省水稻土有机碳储量估算和密度比较研究

Estimation of Organic Carbon Storage and Comparative Analysis of Carbon Density in Paddy Soil of Zhejiang Province

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 plays an important role in global carbon cycle. Data from general detailed soil survey Ⅱ was used in this study. Organic carbon density and storage of paddy soil, as well as their spatial distribution in Zhejiang Province was calculated by soil type method. The result showed that the total organic carbon stock in paddy soil of Zhejiang Province was 165.99 Pg in the area of 18423 km^2 and the average value of carbon density to the depth of 100cm was 8.28 kg m^-2. The distribution of carbon densitiy was relatively high in the plain along the coast while low in the central and southwestern of the province. Soil organic carbon density in several provices was comparied. Similarly using national soil survey data and soil type method, the soil carbon density results were quite different because of data missing and little diffence between the equations.