Research on Soil Organic Carbon Distribution and Change Trend in Middle-East Plain and Its Vicinity in China
详细信息
- 责任者：Xi Xiaohuan (China Geological Survey ; Beijing 100037 ; China) ; Li Min
- 刊名：Earth Science Frontiers
- 出版年：2013
- 卷期：20(1)
- 关键词：土壤 ; soils ; 有机碳 ; organic carbon ; 中国 ; China
- 页码：p.154-165
- 图表：illus., 21 tables, 25 refs.
- 分类号：1800
- issnNo：ISSN1005-2321
- isbnNo：CN11-3370/P
摘要
Soil organic carbon in middle-east China can be studied by comparison based on the data obtained by multi-purpose regional geochemical survey.The middle-east plain covers the terrain of Hebei,Henan,Hubei,Hunan,Guangdong and Hainan provinces,ranging from relatively higher latitude to low latitude and crossing temperate zone,subtropical zone and tropical zone.More than 334000km 2 were covered in the multi-purpose regional geochemical survey.Top soil(0-0.2m) carbon storage is 906.84 Mt and average carbon density is 2716.93t / km 2.Including the higher soil carbon density in the northeastern plain,the carbon density in middle-east regions of China exhibited the changing pattern of highlowhighlow from the northeastern plain downward to Hainan Province,that is 3327.8t / km 2(northeastern plain) 2207.39,2421.02t / km 2(Hebei and Henan) 3442.15,3942.92t / km 2(Hubei and Hunan) 2255.90,2936.72t / km 2(Guangdong and Hainan).The soil carbon density in agricultural ecosystem and urban ecosystem presented different changing rule from higher latitude to lower latitude,i.e.,in agricultural farmland it changes from low to high,and in urban soil from high to low.The soil organic carbon increased by 14.5%(totally increasing 115.18Mt and annually averaging 5.76Mt / a) during past 20years compared to the value achieved by the second soil reconnaissance.However organic carbon did not increase evenly.The rising rate decreased from low latitude to high latitude,and organic carbon increased in agricultural and urban ecosystem but decreased in tideland,rivers,lakes,grassland,forest and swamp.