长期垦殖对滨海咸化湿地土壤有机碳全氮的影响.docVIP

天 津 师 范 大 学 本科生毕业论文（设计） 题目：长期垦殖对滨海咸化湿地土壤有机碳、全氮的影响 学 号： 姓 名： 高爽 专 业： 地理科学 年 级： 2009级 学 院： 城市与环境科学学院 完成日期： 2013年 5月 指导教师： 王义东 长期垦殖对滨海咸化湿地土壤有机碳、全氮的影响 摘要：为满足社会经济发展的不断要求，在滨海地区，湿地垦殖为农田十分普遍。本文以天津滨海典型咸化湿地（七里海和大黄堡）为研究对象，采用剖面（0-100 cm）取土法，探讨长期垦殖（约60年）对湿地土壤有机碳、全氮的影响。结果表明：滨海咸化湿地开垦为农田后，土壤各层有机碳含量下降明显，尤其在表层0~30 cm显著下降。表层全氮含量显著下降，七里海湿地开垦为农田后下降0.33%，大黄堡下降0.53%，深层影响相对较小。由于大黄堡比七里海距海更远，受海水扰动影响小，大黄堡湿地有机质含量高于七里海湿地，开垦为农田后，两地土壤有机质含量差异减小。目前对被垦殖的滨海咸化湿地研究尚少，本研究可以弥补相关不足。 关键词：有机碳；全氮；长期垦殖；滨海湿地；盐渍化 Long-term Effect of Reclamation on Soil Organic Carbon and Total Nitrogen of Two Coastal Saline Wetlands Abstract: In order to meet the social and economic development, a large number of wetlands were reclaimed to farmland. In coastal areas, reclamation of wetlands to farmlands is very common. In this study, we studied the long-term (approximately 60 years) effect of reclamation on soil organic carbon and total nitrogen as well as their profile distribution in two typical saline wetlands (Qilihai and Dahuangpu) in Tianjin, eastern China. The results showed that reclamation significantly decreased the content of soil organic carbon, Especially at the surface layer，0 to 30 cm, while reclamation significantly reduced the total nitrogen content at the surface layer but not for the deep layers. At the surface layer, the contents of organic carbon was reduced by 0.33% After the reclaimation, while Dahuangpu by 0.53% . The contents of organic carbon and total nitrogen of Dahuangpu were higher than that of Qilihai due to the lower salinity induced by the longer distance away from the coastal line. After the reclaimation, the difference of soil organic carbon and total nitrogen in soils between the two sites is reduced. At present, study of reclamation of wetlands to farmlands was little, this study can make up the def