洞庭湖区近二十年来土壤碳储量变化规律及影响因素研究

对比第二次全国土壤普查土壤有机质含量和2004年湖南省生态地球化学调查获得的土壤碳分布数据,对研究区分区域统计20余年碳量变化,对规律和原因进行分析,结果表明:(1)研究区土壤碳量在近二十年增长了5.74*106 t,每平方公里增长了147t;长株潭城市群区碳量增长了1200t/km2;洞庭湖平原区减少了300t/km2,研究区土壤碳量变化与区域地理位置相关.(2)土壤碳量的变化主要与地质地貌背景有关,其次与土地利用方式、土壤类型有关.(3)与全国相比,研究区土壤每平方千米碳储量高出4045t.

Chang Rules of Soil Carbon Storage in Dongting Lake Region Within 20 Years and Its Influencing Factors

By comparing the soil carbon distribution between the second national soil survey in Hunan province and the ecological geochemical survey,we know that in more than 20 years the soil carbon has changed a lot in the same region.First,soil carbon in the study area has increased 5.74*106t and each square kilometer increases 147t.Second,the soil carbon in Changsha-zhuzhou-xiangtan city cluster has increased 1200 t/km2.Third,Dongting lake plain has reduced to 300 t/km2.So the change of the soil carbon is related to regional geography position.In addition,the change of soil carbon is closely related to the geological background,land use type and soil type.Compared with the national soil carbon,the soil carbon in the study area has increased about 4045 t/km2.