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张泽民,吕昌河,谢苗苗,周 伟.基于WorldView 2影像的矿区植被重建效果评估.生态学报,2018,(4).http://dx.doi.org/10.5846/stxb201701180155  
基于WorldView 2影像的矿区植被重建效果评估
Evaluation of Vegetation Restoration in Mining Areas Based on WorldView 2 Images
投稿时间:2017-01-18  修订日期:2017-10-27
DOI: 10.5846/stxb201701180155
关键词WorldView 2  植被盖度  安太堡矿  混合像元模型
Key WordsWorldView 2  vegetation coverage  Antaibao mine  mixed pixel model
基金项目国家重点研发计划(2017YFC0504401);国家自然科学基金(41641008)
作者单位E-mail
张泽民 中国科学院地理科学与资源研究所 zhangzm.16b@igsnrr.ac.cn 
吕昌河 中国科学院地理科学与资源研究所  
谢苗苗 中国地质大学北京 土地科学技术学院 xiemiaomiao@cugb.edu.cn 
周 伟 中国地质大学北京 土地科学技术学院;  
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摘要:
植被盖度反映植被质量,是评价矿区复垦土地植被重建效果的重要指标。该文选择安太堡矿区为案例区,基于高空间分辨率WorldView 2(WV 2)影像新波段,使用混合像元模型和实地数据验证相结合的方法计算得到研究区的植被盖度,并对植被重建效果进行了评估,主要得到以下结论:(1)基于WV 2影像的近红外2波段和红波段,采用混合像元法得到的植被盖度反演值Fc2与实测值最为接近,相关性最强(R=0.958),均方根误差最小(RMSE=0.048);(2)研究区植被重建效果整体较好,中等、较高和高植被盖度区域占研究区的60%以上,低植被盖度仅占22.09%。受植被重建年限和管理措施的影响,不同复垦区域植被重建状况之间存在着差异,内排土场、西排土场、南排土场的植被效果较好,而西排土场扩大区植被状况相对较差,其中等及以上植被盖度所占比例依次为75.24%、68.35%、68.20%、22.29%。(3)就植被组合模式看,乔灌草模式重建效果(按冠层盖度)最好,其次是乔草模式,其它模式如灌草、草地、自然恢复地依次降低。土壤表层水分含量随着复垦地植被盖度的增大而增大,说明植被重建状况对土壤表层的水分保持具有重要作用。
Abstract:
Vegetation coverage fraction reflects the quality of vegetation and thus is an important index to evaluate the vegetation restoration effect of reclaimed land in mining areas. This study, taking Antaibao mining areas as the case, evaluated the currency of different vegetation indices with the pixel dichotomy model based on the new band of WorldView 2 (WV 2) image and field measured data, and then abstracted the vegetation coverage fraction of the study area as to indicate the vegetation restoration effect. The results show that: (1) With near-infrared 2 and red-band of WV 2 image, vegetation coverage fraction (Fc2) calculated by mixed-pixel method is mostly close to the field measured values (RMSE = 0.048). (2) The study areas have been well restored: in more than 60% of the area, vegetation coverage fraction was at moderate to high level, while in only 22.09%, it was lower than 20%. Affected by the duration and management measures, the vegetation restoration differed among the plots: in Inner Dump, West Dump, and South Dump, vegetation restoration is better with the proportion of moderate to high coverage being 75.24% 68.35%, and 68.20%, respectively, than in Expanded West Dump (the proportion only 22.29%). (3) In terms of vegetation restoration pattern, the combination of grass, shrub and trees has the best restoration effect, followed by inter-planting of grass and trees, and others as shrub grass, only grass vegetation, and natural restoration are relatively poor. The soil surface water content rises with the increase of vegetation coverage fraction, implying that vegetation status plays an important role in soil surface water retention.
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