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Land use effects on soil quality along a native wetland to cropland chronosequence

Wang, Quanying, Liu, Jingshuang, Wang, Yang, Guan, Jiunian, Liu, Qiang, Lv, Dui-an
European journal of soil biology 2012 v.53 pp. 114-120
chronosequences, cropland, enzyme activity, enzymes, land use change, physicochemical properties, soil, soil organic carbon, soil quality, soil sampling, wetlands
A large proportion of wetlands that once existed have been destroyed, and a factor usually neglected is how the duration of cultivation affects soil quality. This study aimed to reveal how land use change impacts soil quality in the temporal dimension through soil organic carbon, water-stable aggregates, and enzymes activities. Soil samples from a native wetland and five croplands which have been cultivated for 3, 8, 16, 22, and 24 years were collected. The results showed that the change patterns for the parameters measured were not straightforward along the temporal dimension, and the cultivated-time of 16 years can be regarded as the critical point of short-term and long-term impacts. Our results also implied that >1000 μm and <53 μm soil aggregate fractions were more sensitive to land use changes, and the total soil organic C losses in the croplands were mainly due to these two fractions. In addition, the geometric mean of the assayed enzyme activities (GMea) has been proven to be integrative enough to evaluate soil quality without analyzing physical and chemical properties. Therefore, we must pay attention to the detailed information of soil quality along the temporal dimension after the native wetland is converted to the cropland.