| 石羊河流域植被指数时空变化及荒漠化遥感监测 |
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| 引用本文： | 文星,段翰晨,廖杰,薛娴.石羊河流域植被指数时空变化及荒漠化遥感监测[J].吉林大学学报(地球科学版),2012(Z1):415-422. |
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| 作者姓名： | 文星 段翰晨 廖杰 薛娴 |
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| 作者单位： | 中国科学院寒区旱区环境与工程研究所沙漠与沙漠化重点实验室 |
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| 基金项目： | 国家重点基础研究发展计划项目(2009CB421301) |
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| 摘 要： | 利用SPOT VGT NDVI数据对石羊河流域1999—2010年期间植被覆盖的时空变化进行了研究,并基于像元二分模型求算植被覆盖度,以植被覆盖度为指标对研究区荒漠化程度进行定量监测与评价。结果表明:12年来石羊河流域植被覆盖度整体呈增加的趋势,增加速率为0.003 2 a-1。植被改善的面积远大于植被退化的面积,植被改善区域的面积为11 130 km2,占研究区总面积的26.45%,主要分布在金昌、永昌、民勤、武威东部以及古浪的西北部地区;植被退化区域的面积为3 546 km2,占研究区总面积的8.43%,主要分布在天祝藏族自治县的东部和古浪南部的乌鞘岭地区。荒漠化土地面积整体呈下降的趋势,极重度荒漠化土地明显减少,转化为重度荒漠化;非荒漠化土地的增加主要以绿洲的扩张为主。
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| 关 键 词： | 石羊河流域 植被指数 荒漠化 遥感 监测 |
RS Monitoring of the Spatial-Temporal Variation of Vegetation Index and Desertification in Shiyang River Basin |
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| Wen Xing,Duan Han-chen,Liao Jie,Xue Xian.RS Monitoring of the Spatial-Temporal Variation of Vegetation Index and Desertification in Shiyang River Basin[J].Journal of Jilin Unviersity:Earth Science Edition,2012(Z1):415-422. |
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| Authors: | Wen Xing Duan Han-chen Liao Jie Xue Xian |
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| Institution: | Key Laboratory of Desert and Desertification,Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences,Lanzhou 730000,China |
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| Abstract: | The spatial-temporal variation of the vegetation cover in Shiyang River Basin was investigated according to SPOT VEGETATION NDVI data from 1999 to 2010.The vegetation cover was estimate as an indicator to monitor and evaluate the desertification quantitatively.The whole vegetation coverage of Shiyang River Basin shows an increasing trend with a rate of 0.003 2 a-1 in recent 12 years.The area of vegetation restoration was far greater than the area of vegetation degeneration.The area that vegetation cover was improved was 11 130 km2,accounting for 26.45% of the total area,which mainly appeared in Jinchang,Yongchang,Minqin,east of Wuwei and northwest of Gulang County.The area that vegetation cover was degraded was 3 546 km2,accounting for 8.43% of the total area,which mainly appeared in east of Tianzhu County and Wushaoling region.The area of desertification land overall took on a decreasing trend.Extremely severe desertification land significantly transformed into severe desertification land;the increased non-desertification land was characterized by the expansion of the oasis. |
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| Keywords: | Shiyang River basin vegetation index desertification remote sensing monitoring |
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