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摘要： 全球气候变化导致植被生长的季节性节律事件（如返青期、衰落期和生长峰值期等）发生显著变化。植被返青期、衰落期和生长季长度的变化已经得到广泛报道，植被生长峰值代表植被光合作用能力和对气候变化的响应，目前关于植被生长峰值特征（时间点和最大生长幅度）的时空变化和控制机理的研究相对较少，仍需在不同区域深入探讨。以植被覆盖度较好的中国东北地区为例，首先利用长时序遥感NDVI数据（GIMMS NDVI3g）和逻辑斯蒂法提取植被关键物候参数，然后分析了植被生长峰值关键特征（日期和幅度）的变化格局及对气候因子和返青期物候的响应，最后探索了生长峰值对植被生产力变化的贡献。结果表明：东北地区整体的生长峰值时间点和返青时间点呈现延迟趋势、生长幅度呈上升趋势（与MODIS EVI趋势验证一致），生长峰值存在一个约11 a的周期；季前气温和降水对生长幅度的影响范围和幅度较小，主要作用在草原区域，对峰值时间点的显著影响主要在北部森林区域；返青期对生长峰值的控制作用大于气温和降水因素，并且返青期在森林和草原区域主要影响生长幅度变化，在农作物区主要影响生长峰值时间点变化；植被最大生长幅度对自然植被生产力长期变化的影响显著。东北地区生长峰值及对气候、物候响应的不同时空格局反映了植被生长峰值对气候变化的适应能力的差别，并造成多样的植被固碳格局。生长峰值研究有助于深入理解植被光合作用的时空变化格局和气候变化情景下的碳循环过程，对我国东北地区的生态系统评估和管理也有参考意义。 关键词： 植被物候;  生长峰值;  生长峰值期;  植被生产力;  返青期;  中国东北     Abstract: Global climate change has substantially induced significant changes in vegetation growth events， such as timing of spring， autumn and magnitude of growth peak. Growth season length and its control parameter spring onset and autumn offset have been widely studied. Vegetation growth peak represents the maximum capability of photosynthesis and responds sensitively to climatic change. Currently， studies on the dynamic of vegetation peak growth and the underlying mechanism remain limited and should be analyzed deeply at different regions. This paper took Northeast China （NEC） as an example， then used long-term satellite-based NDVI and logistic method to derive key vegetation phenological parameters. The spatiotemporal dynamics of vegetation peak phenology and its impact on vegetation production were estimated. The results indicate that： position of peak （POP） and spring onset （SOS） show a delayed trend with an amplified PEAK. These parameters also present a period cycle of 11 year. From spatial range and magnitude， temperature and precipitation prior POP have a weak impact on PEAK， which mainly distribute in grassland. Temperature and precipitation has a significant impact on forests in the northern part of NEC. The impact from SOS on PEAK and POP is more obvious than that from temperature and precipitation， and mainly affect vegetation PEAK in forest and grassland. SOS plays a key role in regulating POP in cropland. Vegetation peak growth has an important and positive effect on vegetation production. The varying spatiotemporal patterns of POP， PEAK reflect the difference in their capability for adapting to climatic change and shape the pattern of carbon sink. This study can improve our understanding spatiotemporal changes of photosynthesis and carbon cycle in the context of climate change. Besides， these findings are helpful for ecological system management and estimation in Northeast China.

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