Satellite monitoring of boreal forest phenology and its climatic responses in Eurasia
Satellite monitoring of boreal forest phenology and its climatic responses in Eurasia
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欧亚大陆北方森林物候及其气候响应的卫星监测
DOI：
10.1080/01431161.2017.1339925
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发表时间：
2017-06
影响因子：
3.4
通讯作者：
Zang Shuying
中科院分区：
文献类型：
--
作者：
Li Haibo;Wang Cuizhen;Zhang Lijuan;Li Xiaxiang;Zang Shuying
欧亚大陆北部脆弱的生态系统对全球气候变化非常敏感。陆地表面物候学为我们更好地了解这一偏远地区北方针叶林的现状及其气候响应提供了重要工具。本研究利用1982-2011年新一代AVHRR GIMMS NDVI3g产品，提取了研究区4个物候指标，包括季节开始(SOS)、季节结束(EOS)、季节长度(LOS)和季节中期(MOS)。进行了线性和Mann-Kendall趋势分析，以考察它们的时空格局及其与气候变量的关系，并辅以CRU再分析气候数据集。春季提前增绿与以往的研究一致，但我们的结果表明，SOS推进主要发生在欧亚大陆南部的混交林中。更重要的是，这项研究提取了60°N以上针叶林季末提前EOS和以下混交林延迟EOS的相反趋势。总体而言，在过去的30年里，5-10月的气温连续上升。降雨量也有所增加，但模式零散。横跨欧亚大陆的高级SOS与欧亚大陆较暖的春季(4-5月)高度相关。EOS与秋季降水(9月)有很强的负相关关系。建议对欧亚大陆北部不同林区的EOS趋势及其环境/生态后果进行进一步调查。
The fragile ecosystems in boreal Eurasia are sensitive to global climate change. Land surface phenology provides an important tool for us to better understand the current status of boreal forest and its climatic responses in this remote zone. This study utilizes the new-generation AVHRR GIMMS NDVI3g products in 1982-2011 to extract four phenological metrics in the study region, including start of season (SOS), end of season (EOS), season length (LOS) and middle of season (MOS). Linear and Mann-Kendall trend analyses are performed to examine their spatiotemporal patterns and relationships with climatic variables assisted with the CRU re-analysis climatic datasets. While advanced spring greening is observed in agreement with past studies, our results reveal that the SOS advance mostly occurs in mixed forests in southern Eurasia. More importantly, this study extracts the opposite trends for the end of season – advanced EOS in coniferous forests above 60ºN and delayed EOS in mixed forests below. Overall, temperature in May-October has consecutively increased in the past 30 years. Precipitation has also increased but with a fragmented pattern. The advanced SOS across Eurasia is highly correlated with a warmer spring (April-May) in Eurasia. The EOS has a strong, negative relationship with fall precipitation (September). Further investigation is suggested to examine the opposite EOS trends and their environmental/ecological consequences in different forest zones of boreal Eurasia.
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DOI：
10.1002/joc.1181
发表时间：
2005-05-01
期刊：
INTERNATIONAL JOURNAL OF CLIMATOLOGY
影响因子：
--
作者：
Mitchell, TD;Jones, PD
通讯作者：
Jones, PD
影响因子：
13.5
作者：
Hird, Jennifer N.;McDermid, Gregory J.
通讯作者：
McDermid, Gregory J.
影响因子：
9.8
作者：
Crabbe, Richard A.;Dash, Jadu;Marek, Michal V.
通讯作者：
Marek, Michal V.
DOI：
10.3390/rs5052093
发表时间：
2013-05
期刊：
Remote. Sens.
影响因子：
--
作者：
J. Bi;Liang Xu;A. Samanta;Zaichun Zhu;R. Myneni
通讯作者：
J. Bi;Liang Xu;A. Samanta;Zaichun Zhu;R. Myneni
影响因子：
3.4
作者：
HOLBEN, BN
通讯作者：
HOLBEN, BN