| 湿地生态系统碳汇与碳源过程的控制因子和临界条件 |
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| 引用本文： | 孟伟庆,吴绽蕾,王中良.湿地生态系统碳汇与碳源过程的控制因子和临界条件[J].生态环境,2011(Z2). |
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| 作者姓名： | 孟伟庆 吴绽蕾 王中良 |
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| 作者单位： | 天津师范大学城市与环境科学学院;天津师范大学天津市水资源与水环境重点实验室; |
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| 基金项目： | 天津市自然科学基金重点项目(11JCZDJC24500;10JCZDJC24800); 973计划前期研究专项(2010CB434806) |
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| 摘 要： | 湿地生态系统由于其自身的结构组分特征,已成为地球表层系统中最为重要的碳汇。但是近年来对于湿地系统的不合理开发利用、降水减少等原因使其碳汇功能减弱,湿地的碳蓄积能力下降且有转变为碳源的趋势。文章从湿地生态系统的水份、植物类型、土壤厚度、微生物(底物、pH、温度、氧化还原条件)等方面总结了影响湿地碳汇/源过程的控制因子和临界交替条件。湿地水位的高低决定湿地的氧气环境,与甲烷产生量成正相关,但却与二氧化碳产生量有一定的负相关关系。湿地植物通过通气组织与根系分泌物等影响湿地碳的吸收与排放通量,湿地植株的高度、覆盖率等也是影响湿地作为碳汇与碳源的重要因素。不同深度土层由于其产甲烷菌、甲烷氧化菌等微生物活性不同导致各个土层碳吸收、排放通量的差异,通常浅层土壤中的CO2、CH4的产生率高于深层土壤。微生物的活跃程度直接影响到湿地碳的吸收与排放,影响活跃程度的因素包括湿地底物、pH、温度与氧化还原条件等。湿地底物浓度的增加会在一定程度上提高甲烷的产生率,中性或者是弱碱性环境是产甲烷菌的最适宜条件,在一定范围内温度越高,甲烷产生量越大,而温度对于二氧化碳的影响则是通过改变光合作用来实现。氧化还原电位与甲烷产生量成负相关关系,-...
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| 关 键 词： | 湿地生态系统 碳源 碳汇 控制因子 临界交替条件 |
Control factors and critical conditions between carbon sinking and sourcing of wetland ecosystem |
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| MENG Weiqing,WU Zhanlei,WANG Zhongliang, .College of Urban , Environment Science,Tianjin Normal University,Tianjin ,China,.Tianjin Key Laboratory of Water Resources , Environment.Control factors and critical conditions between carbon sinking and sourcing of wetland ecosystem[J].Ecology and Environmnet,2011(Z2). |
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| Authors: | MENG Weiqing WU Zhanlei WANG Zhongliang College of Urban Environment Science Tianjin Normal University Tianjin China Tianjin Key Laboratory of Water Resources Environment |
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| Institution: | MENG Weiqing1,2,WU Zhanlei1,WANG Zhongliang1,2 1.College of Urban and Environment Science,Tianjin Normal University,Tianjin 300387,China,2.Tianjin Key Laboratory of Water Resources and Environment |
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| Abstract: | Wetlands is the most important carbon sink as its special structure and characteristics.However the carbon sink functional of wetland has been weakened because of climate change and utilization,thus the trend that carbon sink conversion into carbon source is obvious.The control factors and critical conditions between carbon sinking and sourcing of wetland ecosystem were sum-marized from water content,plant types,soil thickness and microorganism which include substrate,pH,temperature and redox con-ditions.Th... |
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| Keywords: | wetland ecosystem carbon source carbon sink control factor critical alternating conditions |
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