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《Acta Ecologica Sinica》 2005-02
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Effects of water on mineralization of organic carbon in sediment from wetlands

ZHANG Wen-Ju~(1, 2), TONG Cheng-Li~2, YANG Gai-Ren~2, WU Jin-Shui~(1,2) (1. College of Resource and Environment, Huazhong Agriculture University, Wuhan 430070, China; 2. The Key Laboratory of Subtropical Agro-ecology, Institute of Subtropical Agriculture, CAS, Changsha 410125, China).Acta Ecologica Sinica,2005,25(2):249~253.  
Wetland ecosystems are under water-rich hydrographical environment and generally accumulate in an abundant amount of organic carbon (C) in their sediment layers. For better understanding the mechanisms in the accumulation of organic C in wetlands, the interactions between water condition and the mineralization of organic C were studied using the sediments of marshy meadow and fen from North China. The sediments were adjusted into 5 gradient of water contents: 24%~146%WHC for the marshy meadow, and 16%~104%WHC for the fen (giving both with comparable moisture conditions from lightly-moisturized to waterlogged) and incubated at 25℃ for 130 d. Results showed that the mineralization rate of organic C in the sediment from the marshy meadow at the 5 gradients of water contents decreased significantly during the early phase (11~30 d), then maintained at steady but lower levels throughout the 130 d incubation period. The accumulative amount of CO_2-C evolved from the sediment during the 130 d incubation increased significantly as water content increased from 24%WHC (lightly-moisturized) to 66%WHC, then decreased slightly as water content increased further to a level over 100%WHC (waterlogged). These results suggest that the mineralization of organic C in the sediment of the marshy meadow was not affected by high water condition. However, interactions between water condition and the mineralization of organic C in the sediment of the fen were more complicated. When incubated under a water content of 16% and 104%WHC, the mineralization rates of organic C in this sediment were generally stable throughout the 130 d incubation period. With 30% and 50% WHC, the mineralization rate increased significantly during the phase between 30 d and 90 d. The accumulative amount of CO_2-C evolved from the sediment of the fen during the 130 d incubation period increased by approximately 4 folds as water content increased from 16%WHC to 30%WHC. However, the accumulative amount of CO_2-C evolved decreased in a large extent as water content increased further. The accumulative amount of CO_2-C evolved over the 130 d at 104%WHC accounted for only 22% of that CO_2-C evolved at 30%WHC. These data propose that the mineralization of organic C in the sediment of the fen (maintained under waterlogged environment) is strongly limited by high water condition. This is suggested to be a fundamental mechanism in the large accumulation of organic C in the sediment of the fen. Data presented also propose that the disappearance of waterlogged environment in peat fen might largely enhance the mineralization of organic C.
【Fund】: 中国科学院知识创新工程重大资助项目 (KZCX1-SW-0 1-14 ) ;; 国家重点基础研究发展规划资助项目 (2 0 0 2 CB412 5 0 3 )~~
【CateGory Index】: Q14
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