上海耕层土壤有机碳空间差异及影响因素

Study on the Influnce of Topsoil Organic Carbon Density and Its Spatial Distribution in Shanghai

区域耕层土壤碳密度及碳储量的变化已经成为全球变化中碳循环研究的重要问题。文章采用了上海市第二次土壤普查资料,估算上海农田耕层土壤有机碳密度及有机碳库,结果表示上海市农田耕层土壤有机碳密度为25.82tC/hm2,低于全国水平;耕层有机碳库含量为1.15×108t;碳密度分布为:西部>东部>中部>岛屿;在水稻土、潮土、滨海盐土、黄棕壤四种常见土类中,水稻土有机碳密度及有机碳库在研究区占有很重要的比重,因此在上海农田耕层土壤中,保护水稻土有很重要的意义。

Carbon storge and sequestration is considered to be an important issue in the study of terrestrial C cycling and global climatic change.This paper based on the data from the second national surveyof Shanghai by the topsoil organic carbon density and organic carbon pool.The data shows the topsoil organic carbon density in Shanghai is 25.82tC/hm2,lower than the country standard.The content of cultivated soil organic carbon pool is 1.15×108t.The distribution of carbon density in Shanghai is: Western area>Eastern area>Central area>Island area.In the four kind of formal soil(paddy field,chaotu,seaside salt soil,yellow brown seil),the organic carbon density and organic carbon pool of paddy field has take an important account on study area.This research shows there is an important significance on protecting paddy field in topsoil in Shanghai.