论文部分内容阅读
选取位于渝西南的江津区为典型研究区,通过实地采样分析和历史资料调研,在GIS技术的支持下,对该区域的农田表层(0~20cm)土壤有机碳密度及储量进行了估算,并探讨其空间分布特征.结果表明,研究区农田表层土壤有机碳含量变化范围为1.14~52.3g/kg,平均有机碳含量为9.47g/kg,有机碳密度均值为2.54kg/m2,低于重庆市和全国的平均水平.从空间分布来看,江津区农田表层土壤有机碳密度分布不均匀,高值区零星分布在江河沿岸及周边地区,低值区由中部向东南部延伸分布.农田表层土壤有机碳总储量为3 668.9×109 g,其中,仅水稻土和紫色土的土壤有机碳储量已占总储量的96.14%.农田表层土壤的有机碳丰度指数介于0.80~1.33之间,其中冲积土最高,紫色土最低.水稻土和紫色土是研究区农田土壤有机碳库调控的重点对象,因此,在当前经济发展中,能否稳定和增加其有机碳的储量对研究区农田土壤有机碳库管理方式的制定与增碳措施的实施具有重要意义.
Taking Jiangjin District located in southwest of Chongqing as a typical research area, soil organic carbon density and reserve in the farmland surface (0 ~ 20cm) were estimated by field sampling analysis and historical data research with the support of GIS technology. The results showed that the surface soil organic carbon content in the study area varied from 1.14 to 52.3 g / kg, with an average of 9.47 g / kg of organic carbon and an average of 2.54 kg / m2 of organic carbon, which was lower than that of Chongqing City and the whole country.From the spatial distribution, the surface soil organic carbon density in Jiangjin area is unevenly distributed, the high value area is sporadically distributed along the riverside and the surrounding area, and the low value area extends from the middle to the southeast.The farmland surface The total soil organic carbon storage was 3 668.9 × 109 g, of which only the soil organic carbon storage of paddy soil and purple soil accounted for 96.14% of the total reserves.The organic carbon abundance index of surface soil of farmland ranged from 0.80 to 1.33, Among them, alluvial soil is the highest and purple soil is the lowest, and paddy soil and purple soil are the key targets for the regulation of farmland soil organic carbon pool in the study area. Therefore, in the current economic development, whether it can stabilize and increase its organic carbon storage The development and implementation of measures to increase carbon organic carbon pool management of the soil is important.