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| Temporal and spatial dynamics of enzyme activities and organic carbon in sediments of Caohai wetland of Guizhou Plateau |
| LI Yang1, XIA Pin-hua2, GE Hao1, GUO Guang-xia3 |
1. College of Life Science, Guizhou Normal University, Guiyang 550001, China;
2. Guizhou Key Laboratory of Mountainous Environment Information System and Eco-Environmental Protection, Guizhou Normal University, Guiyang 550001, China;
3. State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China |
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Abstract The present study focused on the investigation on the contents of organic carbon and the activities of extracellular enzymes as well as the related environmental factors in the sediments of different water level gradients in Caohai County,Guizhou Provincewere,from March to Decemberin 2015 with an interval of one month.The results showed that the organic carbon content in the sediments of the grassland ranged between 243.03~37.35g/kg.Along with the declining of water level,the wetland was degraded,organic carbon was largely reduced and the soil carbon pool was lost.Polyphenol oxidase (PPO) exhibited a low activity in the Yanzicai wetland of profundal zone,and this enzyme activity increased with the decline of water level.However,the activities of hydrolases,such as invertase,urease and phosphatase,were not elevated,which is not totally consistant with the "enzyme lock" mechanism hypothesis.Moreover,a strongly negative correlation was observed between the PPO activity and organic carbon content in sediments,and a certain negative correlation between PPO activity and phosphatase activity.No significant correlation existed between PPO activity and invertase or urease.The temporal and spatial dynamics of enzyme activity could be well explained by phytomass and soil physio-chemical indicators (TN,TP,pH,SMC).Based on the above results,it is suggested that the increase of PPO activity caused by the water level declining could be an important mechanism underlying carbon pool loss in sediments of grassland wetland.
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Received: 07 November 2016
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