Solar-induced chlorophyll fluorescence is strongly correlated with terrestrial photosynthesis for a wide variety of biomes: First global analysis based on OCO-2 and flux tower observations
Solar-induced chlorophyll fluorescence is strongly correlated with terrestrial photosynthesis for a wide variety of biomes: First global analysis based on OCO-2 and flux tower observations
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DOI：
10.1111/gcb.14297
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发表时间：
2018-09-01
影响因子：
11.6
通讯作者：
Varlagin, Andrej
中科院分区：
文献类型：
--
作者：
Li, Xing;Xiao, Jingfeng;Varlagin, Andrej
太阳诱导的叶绿素荧光(SIF)越来越多地被用作陆地总初级生产力(GPP)的替代指标。以前的工作主要是评估卫星观测的SIF和格网GPP产品之间的关系，两者都是基于粗空间分辨率。从轨道碳观测站-2(OCO-2)测得的更高分辨率的SIF(1.3千米×2.25千米)提供了利用通量塔GPP数据在生态系统尺度上检查SIF-GPP关系的第一次机会。然而，目前还不清楚每个生物群之间的关系有多强，以及各种生物群之间是否存在强大的、普遍的关系。在这里，我们首次对全球8个主要生物群的通量站点的OCO-2、SIF和塔式GPP之间的关系进行了全球分析。OCO-2 SIF与塔GPP在中午和日时间尺度上都有很强的相关性，其中以757 nm处的SIF相关性最强(R-2=0.72，p
Solar-induced chlorophyll fluorescence (SIF) has been increasingly used as a proxy for terrestrial gross primary productivity (GPP). Previous work mainly evaluated the relationship between satellite-observed SIF and gridded GPP products both based on coarse spatial resolutions. Finer resolution SIF (1.3kmx2.25km) measured from the Orbiting Carbon Observatory-2 (OCO-2) provides the first opportunity to examine the SIF-GPP relationship at the ecosystem scale using flux tower GPP data. However, it remains unclear how strong the relationship is for each biome and whether a robust, universal relationship exists across a variety of biomes. Here we conducted the first global analysis of the relationship between OCO-2 SIF and tower GPP for a total of 64 flux sites across the globe encompassing eight major biomes. OCO-2 SIF showed strong correlations with tower GPP at both midday and daily timescales, with the strongest relationship observed for daily SIF at the 757nm (R-2=0.72, p