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《Acta Ecologica Sinica》 2004-02
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Carbon mineralization potential in soils under different degraded sandy land

SU Yong-Zhong, ZHAO Ha-Lin,ZHANG Tong-Hui, ZHAO Xue-Yong(Cold and Arid Regions Environmental and Engineering Research Institute, CAS, Lanzhou, 730000, China).  
The mineralization of soil organic C is an important process regulating the functioning of natural and managed ecosystems. It controls the fluxes of the soil nutrients. In nutrient-poor sandy land ecosystem, the nutrient turnover and the energy transfer between plants and soils depends in large part on the input of litter and its mineralization in the soil. Information on sandy soil C mineralization and its response to a changing environment is therefore required for better understanding of biological feedback of desertification and the mechanism of vegetation restoration in terms of C cycling.In this paper, we measured the potential of organic carbon mineralization in four different sandy habitats (shifting, semi-fixed, fixed sand dune and interdunal lowland) and the effects of litter addition from shrubs and annual plants on soil microbial respiration using a laboratory soil incubation experiment. Soil samples were collected from two locations: beneath and outside the canopies of shrub in each habitat. Soils were incubated for 33 days with and without litter addition. The results showed that the differences in C mineralization of soils among habitats correlated with the vegetation cover, litter accumulation, and soil structure, organic C and N contents. With the habitat transformation from the fixed sand land to the shifting sand land, 91 percent of soil organic C was lost. Soil microbial respiration in the shifting sand dune was only 8.6%~10.3% of that in fixed sand dune. This suggested that desertification strongly depleted both bulk of soil organic C and soil labile C pool. Soils amended with Caragana microphylla litter and annual plant litter had the greatest and the lowest microbial respiration, respectively. This might be in part attributed to the N contents and C/N ratios in litters. Caragana microphylla and Artemisia halodendron which distributed widely in Horqin sandy land played an important role not only in fixing mobile sand dune, reducing the intensity and extent of wind erosion, but also in maintaining and improving soil fertility. Shrubs created 'fertile island' with larger organic C and nutrients and microbial activity under their canopies, and therefore, contributed significantly to C sequestration.
【Fund】: 国家重点基础研究发展规划资助项目 (G2 0 0 0 0 4870 4)~~
【CateGory Index】: S158
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