黄土高原植被覆盖度变化的地形分异及土地利用/覆被变化的影响 |
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引用本文: | 刘宇,傅伯杰. 黄土高原植被覆盖度变化的地形分异及土地利用/覆被变化的影响[J]. 干旱区地理, 2013, 36(6): 1097-1102 |
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作者姓名: | 刘宇 傅伯杰 |
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作者单位: | (1 中国科学院地理科学与资源研究所,生态系统网络观测与模拟重点实验室, 北京 100101;2 中国科学院生态环境研究中心,城市与区域生态国家重点实验室, 北京 100089) |
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基金项目: | 国家林业局林业公益性行业科研专项(项目编号:201004058) |
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摘 要: | 基于16 d合成MODIS NDVI数据提取的时间序列植被覆盖度数据,采用一元线性回归趋势分析,对黄土高原2000-2008年植被覆盖度的时空变化及其地形分异、土地利用/覆被变化的影响进行了定量分析。结果表明:(1)研究时段黄土高原植被覆盖度整体呈快速上升趋势,局部下降;(2)黄土高原植被覆盖度变化存在明显的地形分异,陡坡等植被恢复、重建和保育的主要区域植被覆盖度增速显著;(3)土地利用/覆被变化对植被覆盖度的增加影响突出,土地利用/覆被类型变更区植被覆盖度增速显著高于未变化区域,退耕还林还草区增速尤其突出;(4)土地利用/覆被类型未变化区域植被覆盖度总体上也呈增加趋势,但因植被覆盖度水平相对较高,增速明显低于土地利用/覆被类型变化区。上述结果表明,黄土高原植被保育、植被恢复和重建在植被覆盖度提升方面取得了明显成效。
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关 键 词: | 植被覆盖度 地形分异 土地利用/覆被变化 黄土高原 |
收稿时间: | 2013-01-08 |
Topographical variation of vegetation cover evolution and the impact of land use/cover change in the Loess Plateau |
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Affiliation: | (1 Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences, Beijing 100101, China; 2 State Key Laboratory of Urban and Regional Ecology,Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China) |
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Abstract: | Based on the fraction of vegetation cover (FC) derived from 16-day composite MODIS NDVI data, using linear regression approach,the trend of the vegetation cover evolution in the Loess Plateau during 2000-2008 was quantified. The topographic variation of and the effect of land use/cover change has on the FC change rate were quantitatively analyzed. The results show as follows:(1) the FC generally increased in most parts of the Loess Plateau, accompanied by decrease in some patchy areas; (2) there is apparent topographic variation in change rate of FC, characterized by high increase rate in key areas for vegetation restoration and conservation; (3) the land use/cover change dramatically impacts vegetation cover evolution, compared with areas with consistent land use/cover types, the FC change rate is particularly higher in areas with shifted land use/cove types, especially in Green for Grain Project areas; (4) for areas with consistent land use/cover types during the assessed period, partly due to the higher FC baseline, the mean vegetation cover also increased, however, at a lower rate. It can be concluded that the vegetation restoration and conservation significantly promoted FC in the Loess Plateau during 2000-2008. |
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Keywords: | vegetation cover topographic variation land use/cover change Loess Plateau |
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