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滦河上游植被指数NDVI及EVI对SPEI的响应差异

Differences in response of vegetation NDVI/EVI to SPEI in the upper reaches of Luanhe River
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摘要 在全球气候变化和人类活动的双重影响下,干旱呈广发、频发态势,使植被生长受到限制,进而影响生态系统结构,威胁区域生态安全。以滦河上游为研究区,基于2000-2019年归一化植被指数NDVI和增强型植被指数EVI,并结合标准化降水蒸散指数SPEI,分析滦河上游气象干旱和植被生长状况的变化趋势及空间分布特征,探讨植被变化对多时间尺度SPEI指数的响应差异。结果表明:近20年滦河上游SPEI呈波动式增大趋势,年尺度SPEI增大速率为0.0401/a;干旱面积总体减少,减少速率为-1.4304%/a;NDVI和EVI空间分布特征和变化趋势大体一致,植被覆盖度呈东南高西北低的特征,NDVI和EVI增大速率分别达0.027/a和0.026/a;大部分区域SPEI与植被指数呈正相关,其中NDVI对SPEI-3的响应最强,EVI对SPEI-6的响应最强,总体上EVI与SPEI的相关性强于NDVI;草地对气象干旱最敏感,农田次之,林地最弱。 Under the dual impacts of global climate change and human activities,droughts are widespread and frequent,which restricts the growth of vegetation,affects the structure of the ecosystem and threatens regional ecological security in turn.Taking the upper reaches of Luanhe River as the research area,the spatial distribution characteristics of meteorological droughts and vegetation growth conditions were analyzed and the differences in response of vegetation changes to the standardized precipitation evapotranspiration index(SPEI)on multiple time scales were discussed,based on the normalized difference vegetation index(NDVI),enhanced vegetation index(EVI)of 2000-2019 and SPEI.The results showed that SPEI of Luanhe River increased with fluctuations in the past two decades,and the annual SPEI increased at a rate of 0.0401/a;the drought area decreased in general,with a decreasing rate of-1.4304/a.The spatial distribution and trend characteristics of NDVI and EVI were consistent,the growth rate of NDVI was as high as 0.027/a and that of EVI was 0.026/a,the vegetation coverage was high in the east and low in the west;there was a positive correlation between SPEI and vegetation indices in most areas,among which the response of NDVI to SPEI-3 and EVI to SPEI-6 were the strongest,but the correlation between EVI and SPEI was stronger than that between NDVI and SPEI in general.The grassland was the most sensitive to meteorological droughts,followed by the farmland,and the woodland was the weakest.
作者 陈菲 史晓亮 丁皓 李艺 史孟琦 CHEN Fei;SHI Xiaoliang;DING Hao;LI Yi;SHI Mengqi(College of Geomatics,Xi’an University of Science and Technology,Xi’an 710054,China)
出处 《水资源与水工程学报》 CSCD 北大核心 2021年第6期71-77,86,共8页 Journal of Water Resources and Water Engineering
基金 国家自然科学基金项目(52079103)。
关键词 植被指数 标准化降水蒸散指数(SPEI) 空间分布 相关分析 滦河上游 vegetation index standardized precipitation evapotranspiration index(SPEI) spatial distribution correlation analysis the upper reaches of Luanhe River
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