长江中下游地区湿地开垦及土壤有机碳含量变化

Cultivation of Wetlands and Changes of Soil Organic Carbon Content in the Middle and Lower Reaches of Yangtze River

概述了历史时期至今,尤其是20世纪下半叶50a来长江中下游地区湿地的开垦状况;总结了研究区湿地土壤及其开垦为农田后土壤有机碳含量的变化特征。长江中下游地区湿地分布广,存在着湿地开垦强度大、土壤碳密度较低和土壤有机碳损失严重等土壤碳库变化问题。与原湿地土壤相比,湿地被开垦为农田后,土壤有机碳含量总体上在降低,而且随着湿地开发利用年限的增加,其土壤有机碳含量减少的幅度也在增加。

This paper overviewed the cultivation of special emphasized on the cultivation over the last soil organic carbon （SOC） content from literature, wetlands in the middle and lower reaches of Yangtze River, 5 decades. Through a comparative summary of the changes of dynamics of SOC under different land use patterns of wetlands cultivated were analyzed from different geographic regions in study area. Great extent of cultivation, low SOC storage and significant SOC loss tended to be a serious problem for the wetlands in this area. Compared to uncultivated wetlands, SOC of the wetlands cultivated was decreased in different extents, being greater with the longer cultivation duration. Wetland preservation and win - win strategy for wetland cultivation should be pursued within the future framework of climate change mitigation of China in the near future.