| 1990—2019年黑河流域植被覆盖度动态变化及气温对其影响 |
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| 作者姓名： | 王鹏 王雁鹤 韩小龙 韩昊 张德明 张秉强 |
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| 作者单位： | 中国地质调查局西宁自然资源综合调查中心,青海 西宁 810000 |
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| 基金项目： | 中国地质调查局“全国自然资源要素综合观测体系规划与部署(编号: DD20208063)”和“黑河流域自然资源要素综合观测试点(编号: DD20208065)”项目联合资助 |
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| 摘 要： | 植被覆盖度的变化特征是流域生态监测的重要内容,能为流域综合管理决策提供基础信息。黑河流域是中国西北干旱-半干旱地区第二大的内陆河流域。为研究我国西北干旱-半干旱地区的生态状况,以黑河流域为研究区,根据1990—2019年Landsat NDVI数据,综合应用像元二分模型和一元线性回归方法,分析黑河流域植被覆盖度的动态变化并探讨气温对其影响。结果表明: 黑河流域植被覆盖度呈现由南向北递减的空间分布特征; 近30 a来,植被覆盖面积总体呈上升趋势,中高植被覆盖度增长速度最快; 流域大部分地区植被覆盖度保持不变,植被覆盖度增加的区域多于退化区域; 受全球变暖影响,整个流域气温呈升高趋势,中游气温上升最快,上游最慢,流域上游和中游气温的升高对植被覆盖度起到促进作用,下游气温的升高则抑制了植被生长。
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| 关 键 词： | 黑河流域 植被覆盖度 动态变化 气温影响 NDVI |
| 收稿时间： | 2020-12-01 |
Dynamic changes of vegetation coverage in Heihe River Basin from 1990 to 2019 and the effect of temperature on it |
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| Authors: | WANG Peng WANG Yanhe HAN Xiaolong HAN Hao ZHANG Deming ZHANG Bingqiang |
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| Institution: | Xining Natural Resources Investigation Center, China Geological Survey, Qinghai Xining 810000, China |
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| Abstract: | The change features of vegetation coverage are important for the river ecological detection, and can provide basic information for the comprehensive river management. Heihe River Basin is the second largest inland river basin in the arid-semi-arid regions of Northwest China. In order to investigate the ecological status of the arid-semi-arid regions of Northwest China, the authors have taken Heihe River Basin as the study area and comprehensively applied the pixel binary model and unary linear regression to analyze the dynamic changes of vegetation coverage in Heihe River Basin from 1990 to 2019 and discussed the effect of temperature according to the Landsat NDVI data from 1990 to 2019. The results show that the vegetation coverage of Heihe River Basin decreases from south to north. In the past 30 years, the vegetation coverage area has shown an overall upward trend, and the increasing rate of medium-high vegetation coverage area is the fastest. The vegetation coverage in most parts of the basin remains unchanged and the area with increasing vegetation coverage are larger than those with decreasing vegetation coverage. Due to the effect of global warming, the temperature of the entire basin is increasing. The temperature has the fastest increase in the upstream and the slowest increase in the downstream. The temperature increase in the upstream and downstream promotes vegetation coverage, while the temperature increases in downstream restrains the vegetation growth. |
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| Keywords: | Heihe River Basin vegetation coverage dynamic changes temperature influence NDVI |
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