| 摘要: |
| 【目的】评价2000年以来黄河源植被变化趋势及其影响因素。【方法】基于MOD12A5数据，土地利用数据以及同德、玛多、泽库、达日、若尔盖、河南、玛沁、久治和红原9个气象站点的气象数据等，采用趋势分析和相关分析等方法，研究了2000―2018年黄河源植被叶面积指数（LAI）时空变化特征及与气候因子的关系。【结果】①2000―2018年黄河源植被LAI呈上升趋势，其绝对变化率和相对变化率分别为0.09/10 a和0.4%。②2000年时土地利用类型为裸地的区域植被状况正逐渐改善，但局部草地、林地和沼泽仍处于退化趋势。③黄河源年LAI值与气温、降水均呈正相关关系，其中温度有显著影响，气候因子的协调关系和年内时空分配也会极大地影响植被生长，而气候长期趋暖将会给源区植被带来更为复杂的问题和挑战。④生态治理工程实施较好的自然保护区（如鄂陵湖-扎陵湖自然保护区）植被呈明显改善趋势。【结论】气候暖湿化和生态治理工程可能是黄河源植被恢复的主要原因。 |
| 关键词: 植被覆盖； 叶面积指数； 变化趋势； 黄河源 |
| DOI：10.13522/j.cnki.ggps.2019151 |
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| Spatial-temporal Change of Leaf Area Index(LAI) in the Source Region of The Yellow River During 2000―2018 |
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HAN Siqi, MA Zelong, ZHUANG Wenhua, LU Heng, LIU Tiegang, SHEN Jun
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1.State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource & Hydropower, Sichuan University, Chengdu 610065, China; 2. Sichuan Provincial Water Conservancy Research Institute, Chengdu 610072, China; 3. Inner Mongolia Water and Soil Conservation Station, Hohhot 010018, China
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| Abstract: |
| 【Objective】The purpose of this study is to investigate the trend of vegetation change in the source region in the Yellow River (SRYR) and its influencing factors between 2000 and 2018. 【Method】Based on MOD15A2, land use, meteorological data from nine meteorological stations in Tongde, Maduo, Zeku, Dari, Ruoergai, Henan, Maqin, Jiuzhi and Hongyuan, the spatial-temporal trend of the Leaf area index (LAI) in SRYR and the influences of climate change and ecological restoration project on it were analyzed. 【Result】LAI had an increasing trend for the SRYR between 2000 and 2018, and the absolute and relative changing rates were 0.09/10 a and 0.4%, respectively. The bared land had a good improvement while local grassland, forest and swamp still had degradation trend. LAI had significantly positive correlation with annual mean temperature. Moreover, the long-term warming of the climate will bring more complex challenges to the vegetation restoration in future. In the natural preservation zone which conducted effective ecological protection measures, vegetation had significant improvement trend. 【Conclusion】The warming and wetting tendency of climate and vegetation restoration project might be the main reasons of vegetation improvement in SRYR. |
| Key words: vegetation coverage; leaf area index; spatial-temporal trend; source region of the Yellow River |
