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| Effects of land-use type on soil organic matter and carbon management index in Ziwuling area. |
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Abstract The soil organic matter, soil labile organic matter and soil carbon management index(CMI) at different land use conditions in Ziwuling area were studied. The objective was to reveal changes of soil organic matter fraction and their corresponding carbon management indexes as affected by land use patterns. The contents of soil organic matter and three labile organic matter contents decreased with the increase of soil depth, and presented the order of forest land, unploughed abandon land > ploughed abandon land > farmland in soil profile. Within the same depth, three labile organic matter contents and their efficiency ratios followed the order of low labile organic matter > middle labile organic matter > high labile organic matter. With the increase of organic matter activity, the efficiency ratios of three labile organic matters presented the order of unploughed abandon land > forest land > ploughed abandon land > farmland trend in profile soil. In the 0~30cm soil depth, the CMIs of low labile organic matters were markedly higher in forestry land than that in ploughed abandon land and farmland, but showed little difference in soils below 30 cm. However, the CMIs of middle and high labile organic matters were always present the order of forest > ploughed abandon land > farmland in the whole soil profile. The statistical analysis showed that the three labile organic matters were related with major soil properties at significant or very significant level, indicating that labile organic matter could be used to reveal the influence of land use on soil organic matter and carbon management index in Ziwuling area.
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Received: 06 May 2008
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