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科尔沁沙地不同类型沙丘表土有机质与粒度特征差异分析

Analyzing Differences of Topsoil Organic Matter and Grain Size of Different Types of Dunes in Horqin

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【作者】 张桂华刘洪妍介冬梅刘颖蒙萌王江永高桂在李德晖李楠楠牛洪昊冷程程

【Author】 ZHANG Guihua;LIU Hongyan;JIE Dongmei;LIU Ying;MENG Meng;WANG Jiangyong;GAO Guizai;LI Dehui;LI Nannan;NIU Honghao;LENG chengcheng;School of Geographical Sciences, Northeast Normal University;School of Resources Environment and Tourism, Anyang Normal University;Sate Environmental Protection Key Laboratory for Wetland Conservation and Vegetation Restoration;Key Laboratory of Geographical Processes and Geographical Processes and Ecological Security in Changbai Mountains, Ministry of Education;

【通讯作者】 介冬梅;

【机构】 东北师范大学地理科学学院安阳师范学院资源环境与旅游学院国家环境保护湿地生态与植被恢复重点实验室长白山地理过程与生态安全教育部重点实验室

【摘要】 围封禁牧是退化沙地植被恢复的重要措施之一,追踪沙地植被修复对土壤的影响,对保护沙地生态系统具有重要意义。该文分析了科尔沁沙地围封禁牧后固定沙丘、半固定沙丘、半流动沙丘和流动沙丘表土的有机质含量和粒度特征。结果表明:依据植被盖度而划分的4种类型沙丘之间的有机质含量呈显著差异(P<0.05),而盖度与沙丘中值粒径的关系极弱,相关系数r=0.163。利用不同类型沙丘表土的有机质含量和粒度特征参数作聚类分析和主成分分析,发现植被盖度是影响沙丘固定程度最重要的因素,其次是土壤有机质,沙粒粒径与沙丘的固定程度关系极弱,地表植被对沙丘表土的水土保持作用较弱,科尔沁沙地植被恢复还未达到植被-土壤生态系统的良性循环,须继续实施围封禁牧政策。沙丘粒径均以中粒、细粒为主,同一沙丘迎风坡及其坡顶比背风坡颗粒偏粗,分选偏好,峰态偏宽,土壤风蚀作用更严重。因此,在植被重建时可适当采取人工措施,可以流动、半流动沙丘迎风坡的坡顶部分为重点恢复区。

【Abstract】 Banning grazing is one of common ways for vegetation restoration in degraded sandy land. Understanding the effects of vegetation restoration on sandy lands is of great significance to the protection of the sandy land ecosystem. In this study, we analyze the content of organic matter and grain size of topsoil at the fixed dunes, semi-fixed dunes, semi-mobile dunes and mobile dunes after grazing in Horqin sandy lands being banned. The results show that the contents of organic matter of topsoil among four types of dunes are significantly different at the 0.05 level while the correlation between the median particle size and the coverage is not strong(r= 0.163, P=0.01). The cluster analysis and principal component analysis of organic matter content and particle size of topsoil at different types of dunes show that vegetation coverage is a more important factor than the content of soil organic matter affecting the fixation degree of dunes, and grain size has the smallest effect on fixing topsoil of dunes. The influence of surface vegetation on soil and water conservation of dune is small. The functions of ecosystem of Horqin sandy lands has not been fully recovered and thus it is necessary to maintain the current grazing prohibition policy for more years. The grazing ban policy was beneficial to the accumulation of soil organic matter and improved mechanical composition of the soil. The particle sizes of the four different types of dunes are mainly medium and fine, and therefore vegetation reconstruction should be mostly conducted at the top part of the windward slope of mobile and semi-mobile dunes.

【基金】 国家自然科学基金项目(41771214;41971100)
  • 【文献出处】 生态环境学报 ,Ecology and Environmental Sciences , 编辑部邮箱 ,2020年11期
  • 【分类号】S152.4;S153.621
  • 【被引频次】4
  • 【下载频次】324
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