汶川地震前后茂县植被覆盖度变化研究
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摘要
"5.12"汶川地震引起的滑坡、泥石流、崩塌等次生地质灾害对灾区的植被覆盖造成严重的破坏。茂县地处于地震重灾区,查清地震对茂县植被覆盖的破坏程度可为植被修复提供参考依据,便于防控水土流失和地质灾害隐患。选取茂县地震前后Landsat 5TM的遥感影像作为数据源,采用归一化植被指数和像元二分法为估算模型,提取地震前后茂县植被覆盖度数值。通过对数据的研究将该区植被覆盖度划分为4级:高植被覆盖区、中植被覆盖区、低植被覆盖区和无植被覆盖区,并对每种覆盖类型的变化进行统计分析。结果表明,地震对高植被覆盖区的影响最严重,中植被覆盖区的影响次之,低植被覆盖区的影响最小;植被覆盖度破坏较严重的区域主要分布在坡度大于40°的地区。
Landslides,mudslides,avalanches and other secondary geological disasters,triggered by"5.12" Wenchuan earthquake,have severely damaged vegetation in the region.Maoxian County is one of the earthquake disaster areas.Identifying changes of Maoxian County′s vegetation coverage can provide a reference for vegetation restoration and is helpful to control soil erosion and geological disasters.Landsat-5TM remote sensing images for Maoxian County before and after the earthquake are selected as a data source and the normalized difference vegetation index and dimidiate pixel estimation model are used to analyze the vegetation coverage changes.Through the study of the data,the vegetation coverage is divided into high vegetation coverage,moderate vegetation coverage,low vegetation coverage and no vegetation coverage areas.Statistical analysis is made for the coverage change in each area.Results show that the earthquake has severely affected Maoxian County′s vegetation coverage,with the high vegetation coverage area being most seriously affected and the low vegetation coverage area being least affected.The more seriously damaged area is mainly distributed in the slope of more than 40°.
Landslides,mudslides,avalanches and other secondary geological disasters,triggered by"5.12" Wenchuan earthquake,have severely damaged vegetation in the region.Maoxian County is one of the earthquake disaster areas.Identifying changes of Maoxian County′s vegetation coverage can provide a reference for vegetation restoration and is helpful to control soil erosion and geological disasters.Landsat-5TM remote sensing images for Maoxian County before and after the earthquake are selected as a data source and the normalized difference vegetation index and dimidiate pixel estimation model are used to analyze the vegetation coverage changes.Through the study of the data,the vegetation coverage is divided into high vegetation coverage,moderate vegetation coverage,low vegetation coverage and no vegetation coverage areas.Statistical analysis is made for the coverage change in each area.Results show that the earthquake has severely affected Maoxian County′s vegetation coverage,with the high vegetation coverage area being most seriously affected and the low vegetation coverage area being least affected.The more seriously damaged area is mainly distributed in the slope of more than 40°.
引文
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[2]赵英时.遥感应用分析原理与方法[M].北京:科学出版社,2003:172-175,372-375.
[3]陈晓玲,赵红梅,田礼乔.环境遥感模型与应用[M].武汉:武汉大学出版社,2008:16-20.
[4]王桥,杨一鹏,黄家柱,等.环境遥感[M].北京:科学出版社,2005:346-366.
[5]池宏康,周广胜,许振柱,等.表现反射率及其在植被遥感中的应用[J].植物生态学报,2005,29(1):74-80.
[6]马志勇,沈涛,张军海,等.基于植被覆盖度的植被变化分析[J].测绘通报,2007(3):45-48.
[7]陈涛,李平湘,张良培.武汉地区1988—2002年植被覆盖度变化动态分析[J].遥感技术与应用,2008,23(5):511-515.
[8]王兮之,梁钊胸.基于MODIS数据的湟水流域植被覆盖变化研究[J].干旱区资源与环境,2010,24(6):137-142.
[9]李营,张峰,王桥.呼伦贝尔盟草原植被覆盖状况时空演变特征分析[J].干旱区资源与环境,2010,24(6):126-131.
[10]任志明,李永树,蔡国林.一种利用NDVI辅助提取植被信息的改进方法[J].测绘通报,2010(7):41-43.
[11]杨胜天,刘昌明,杨志锋,等.南水北调西线调水工程区的自然生态环境评价[J].地理学报,2003,57(1):11-18.
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