潮滩湿地植被发育年限对土壤有机碳含量及积累速率的影响

发布时间：2018-06-30 00:15

本文选题：土壤有机碳积累速率 + 潮滩湿地　；参考：《生态学杂志》2017年05期

【摘要】：潮滩湿地海陆交互作用强烈,部分环境因子随植被发育年限快速更替,对土壤的固碳过程有着重要影响。本研究选取长江口典型潮滩湿地崇明东滩,通过遥感影像确定各植被带发育年限,利用"空间代替时间"的方法对土壤有机碳含量及积累速率进行探究。结果表明:随植被发育年限增加,土壤有机碳含量逐年增加,植被发育14年的土壤有机碳含量约为发育1年的1.3倍。同时,土壤有机碳积累速率在植被发育初期最高,随后不断降低,约在10年后趋于稳定并保持在11 g·m~(-2)·a~(-1)左右。土壤有机碳含量与国内其他滨海湿地接近,但积累速率远低于美国东海岸新生滨海湿地,很可能是过度放牧、收割等人为干扰所致。因此,保护和恢复滨海湿地对我国实现增汇减排具有重要意义。
[Abstract]:The interaction between sea and land in tidal flat wetland is strong, and some environmental factors change rapidly with the development years of vegetation, which has an important effect on soil carbon sequestration process. In this study, Chongming Dongtan, a typical tidal flat wetland in the Yangtze River Estuary, was selected to determine the development years of each vegetation belt by remote sensing images, and the soil organic carbon content and accumulation rate were studied by the method of "space instead of time". The results showed that the content of soil organic carbon increased year by year with the increase of vegetation development years, and the soil organic carbon content of 14 years of vegetation development was about 1.3 times as much as that of one year of development. At the same time, the accumulation rate of soil organic carbon was the highest in the early stage of vegetation development, then decreased, and stabilized after about 10 years and remained at about 11 g m-2 a ~ (-1). The soil organic carbon content is close to that of other coastal wetlands in China, but the accumulation rate is much lower than that of the new coastal wetlands on the east coast of the United States, which is probably caused by overgrazing and harvesting. Therefore, the protection and restoration of coastal wetlands is of great significance for China to achieve emission reduction.
【作者单位】：华东师范大学河口海岸学国家重点实验室;上海环科环境评估咨询有限公司;
【基金】：国家自然科学基金项目(41271065)资助
【分类号】：S153.6

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