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Land-use induced changes in topsoil organic carbon stock of paddy fields using MODIS and TM/ETM analysis:A case study of Wujiang county,china

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Journal of Environmental Sciences 2008年第7期20卷 852-858页

作者： GAO, Jianfeng PAN, Genxing JIANG, Xiaosan PAN, Jianjun ZHUANG, Dafang Institute of Resources Ecosystem and Environment of Agriculture Nanjing Agricultural University Nanjing 210095 China Institute of Geographical Science and Natural Resources Chinese Academy of Sciences Beijing 100101 China

Topsoil soil organic carbon (SOc) that plays an important role in mitigating atmospheric carbon dioxide (cO_2) buildup is greatly affected by human *** evaluate the influence of land-use changes on SOc stocks in paddy soils,a new algorithm was developed by integrating MODIS (moderate resolution imaging spectral-radiometer) and TM/ETM data for timely monitoring the land-use change in Wujiang ***,the land-use class-maps derived from MODIS and TM/ETM analyses were further used to estima...

关键词： soil organic carbon (SOc) MODIS TM/ETM rice paddies land-use soil c sequestration

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Organic Matter Enrichment and Aggregate Stabilization in a Severely Degraded Ultisol After Reforestation

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Pedosphere 2006年第6期16卷 699-706页

作者： ZHANG Bin PENG Xin-Hua Institute of soil Science Chinese Academy of Sciences Nanjing 210008China

Three types of soils： an eroded barren soil under continuous fallow, an eroded soil transplanted with Lespedeza shrubs （Lespedeza bieolor）, and an eroded soil transplanted with camphor tree （cinnaraomum camphora） were investigated to quantify organic matter pools and aggregates in reforested soils using physical fractionation techniques and to determine aggregate stability in relation to the enrichment of soil organic carbon （SOc）. soil organic matter （SOM） was physically fractionalized into free particulate organic matter （fPOM）, occluded particulate organic matter （oPOM）, and mineralassociated organic matter （mOM）. The SOM was concentrated on the surface soil （0 5 cm）, with an average c sequestration rate of 20-25 g c m^-2 year^-1 over 14 years. As compared to the eroded barren land, organic c content of fPOM, oPOM, and mOM fractions of the soil under Lespedeza and under camphor tree increased 12-15, 45-54, and 3.1-3.5 times, respectively. A linear relationship was found between aggregate stability and organic c （r^2 = 0.45, P 〈 0.01）, oPOM （r^2 = 0.34, P 〈 0.05）, and roOM （r^2 = 0.46, P 〈 0.01） of aggregates. The enrichment of organic c improved aggregate stability of the soil under Lespedeza but not that under camphor tree. However, further research is needed on the physical and biological processes involved in the interaction of soil aggregation and SOc sequestration in ecosystem.

关键词： aggregate stability reforestation organic matter fractions soil c sequestration

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