| 摘要: |
| 气候是湿地形成和发展的主要驱动力,气候变化造成的水分盈亏会对湿地植被产生严重威胁。量化湿地植被对干湿状态的响应特征,对湿地生态恢复具有重要意义。挠力河湿地群是中国重要的淡水沼泽湿地集中区,在全球温带湿地生态系统中具有代表性。因此,本文以挠力河湿地群保护区内的湿地植被为研究对象,基于归一化植被指数(NDVI)和多尺度标准化降水蒸散发指数(SPEI),分析了2003–2023年挠力河湿地群保护区内NDVI及SPEI的演变情况。根据干湿状态将研究期划分为干旱、湿润及洪涝期,在此基础上,揭示了NDVI对SPEI累积效应和滞后效应的响应特征。研究结果显示：在干旱时期,挠力河、东升湿地保护区NDVI对SPEI累积效应和滞后效应的响应时间较短(2个月),七星河、三环泡湿地保护区NDVI对SPEI对累积效应(9个月)和滞后效应(4–6个月)的响应时间较长。在湿润时期和洪涝时期,各湿地保护区NDVI对SPEI累积效应(9个月)和滞后效应(9–10个月、9–11个月)的响应较长。气象条件在轻度干旱和湿润(-1.151.20),以及由干旱向湿润转变时,NDVI与SPEI呈负相关关系。研究结果为湿地植被对气象条件响应特征的深入研究提供参考价值,为湿地生态保护和修复工作提供科学依据。 |
| 关键词: 沼泽湿地 SPEI NDVI 累积效应 滞后效应 |
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| 基金项目:国家自然科学基金项目（面上项目，重点项目，重大项目） |
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| The response characterization of wetland vegetation to dry and wet condition-A Case Study of the Naoli River Group Wetland |
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Wang Zhenshan1, Wang Tianliang2, Jing Haihua1, Liu Jianwei1, Pang Xiaoteng1
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1.:Institute of Water and Environmental Research,Faculty of Infrastructure Engineering,Dalian University of Technology;2.:Heilongjiang Provincial Water Conservancy and Hydroelectric Power Investigation,Design and Research Institute
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| Abstract: |
| Climate is the main driver of wetland formation and development, and moisture gains and losses caused by climate change can pose a serious threat to wetland vegetation. Quantifying the response characteristics of wetland vegetation to wet and dry states is important for wetland ecological restoration. The Naoli River wetland complex is an important freshwater marsh wetland concentration area in China, which is representative of temperate wetland ecosystems around the world. Therefore, this paper analyzed the evolution of NDVI and SPEI in the Naoli River Wetland Group Reserve from 2003 to 2023 based on the Normalized Vegetation Index (NDVI) and Multi-scale Standardized Precipitation Evapotranspiration Index (SPEI), taking the wetland vegetation in the Reserve as the study object. The study period was divided into drought, wet and flood periods according to the dry and wet status, based on which the response characteristics of NDVI to the cumulative and lagged effects of SPEI were revealed. The results showed that in the drought period, the response time of NDVI to SPEI cumulative and lagged effects in Flexi River and Dongsheng Wetland Reserve was shorter (2 months), and the response time of NDVI to SPEI to cumulative (9 months) and lagged (4-6 months) effects in Qixing River and Sanhuanpao Wetland Reserve was longer. The response of NDVI to SPEI to the cumulative effect (9 months) and lagged effect (9-10 months, 9-11 months) was longer for each wetland reserve during the wet period and flooding period. Meteorological conditions showed a positive correlation between NDVI and SPEI in mild drought and wetness (-1.151.20) and the transition from drought to wetness. The results of the study provide reference value for the in-depth study of the response characteristics of wetland vegetation to |
| Key words: Swamp wetlands SPEI NDVI Cumulative effects Lag effects |
