| 科尔沁沙地近水区域景观破碎化时空变化研究——以奈曼旗为例 |
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| 引用本文： | 胡苏军,葛小东,黄超.科尔沁沙地近水区域景观破碎化时空变化研究——以奈曼旗为例[J].干旱区资源与环境,2012(9):125-131. |
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| 作者姓名： | 胡苏军 葛小东 黄超 |
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| 作者单位： | 华中农业大学资源与环境学院 |
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| 基金项目： | 国家自然科学基金项目(40801235)资助 |
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| 摘 要： | 以科尔沁沙地奈曼旗主要地表水体周边7km为案例地,以1987、1999和2009年的Landsat/TM影像为信息源,通过遥感解译、缓冲区建立和景观指标提取,分析水体周边不同距离带的斑块密度(PD)、边界密度(ED)、香农多样性(SHDI)和蔓延度(CONTAG)等指标的时空差异。结果表明:1)1987至2009年期间,近水区域景观斑块总数显著增加,总体破碎化有所增加;2)景观尺度上,离水体越近,PD、ED和CONTAG越高,景观被切割的程度越剧烈、形状更复杂、分布更为离散;3)类型尺度上,离水体越近,耕地、草地和林地的PD和ED越高;而沙地PD和ED不断下降,原有大片沙地被治理为较小斑块,且形状更加规整,人为控制明显。近水区域的景观破碎化时空格局变化表明,受传统农牧业生产方式、气候变化及社会经济发展等因素影响,农牧业对近水区域资源利用的竞争性不断加强,进一步加大了沙漠化风险。
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| 关 键 词： | 景观破碎化 景观指数 近水区域 科尔沁沙地 |
Landscape fragmentation around surface water in Horqin Sandy Land——A case study in Naiman Banner |
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| HU Sujun,GE Xiaodong,HUANG Chao.Landscape fragmentation around surface water in Horqin Sandy Land——A case study in Naiman Banner[J].Journal of Arid Land Resources and Environment,2012(9):125-131. |
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| Authors: | HU Sujun GE Xiaodong HUANG Chao |
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| Institution: | (College of Resources and Environment,Huazhong Agricultural University,Wuhan 430070,P.R.China) |
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| Abstract: | The study was conducted to explore the landscape fragmentation of areas near water in Naiman Banner by using Landsat/TM data in 1987,1999 and 2009 on RS and GIS technology.Four landscape indices of Pacth Density(PD),Edge Density(ED),Shannon Diversity(SHDI) and Contagion Index(CONTAG) were calculated and anylyzed.Results showed that(1) the patch count around surface increased during the period,indicating that the degree of landscape fragmentation increased.(2) The PD and the ED increased during the period.The PD,ED and CONTAG indexes were negatively related to the distance from the edge of the waters,indicating the fragmentizing process near surface water.(3)Land use play an important role in the fragmentizing process near water area.The PD and ED of plantation,grassland and forest increased quickly from 1987 to 2009.It showed that the competition of land use around surface water was more and more heated.The PD and ED of bared sand land decreased during the period,indicating the recovery of sandy desertification.The landscape fragmentation showed the conflicts between the human being and the venerable ecosystem under the climate change and economic development. |
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| Keywords: | landscape fragmentation landscape index region around surface water Horqin Sand Land |
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