基于TROPOMI太阳诱导叶绿素荧光的冠层电导全球制图在区分光照和遮荫叶片的贡献后

IF 4 1区地球科学 Q1 GEOGRAPHY, PHYSICAL

Global and Planetary Change Pub Date : 2025-09-16 DOI:10.1016/j.gloplacha.2025.105089

Xiaoping Wang , Wei He

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引用次数: 0

摘要

陆地植被冠层导度（Gc）的全球制图对于理解陆地碳循环和水循环的行为及其相互作用机制具有重要意义。太阳诱导的叶绿素荧光（SIF）在获得全球Gc方面显示出巨大的前景，但由于表征SIF-Gc关系的能力有限，特别是在高密度植被区，区分阳光照射和遮荫叶片的SIF和Gc对冠层物质的贡献受到阻碍。利用“双叶”生物圈耦合模型（BEPS-LRC）和Ball-Berry模型，通过区分阳光和遮阳叶片的贡献，建立了新的SIF-Gc模型，并利用TROPOMI卫星SIF数据和40个站点的涡动相关通量数据，推导了2018 - 2020年全球Gc分布。我们发现，日照叶片和遮荫叶片的Gc具有相似的季节变化，但前者的变化大于后者，遮荫叶片和遮荫叶片的分化使得SIF能更好地跟踪Gc的季节变化。此外，该模型降低了冠层SIF-Gc关系对大气水汽压亏缺的依赖性，光照叶片和遮荫叶片8个生物群系的R2分别大于0.5和0.4。此外，该模型提高了Gc估计的精度，最小R2为0.52 (SAV)，最大R2为0.79 (MF和OH)，斜率范围为1.04 (CRO) ~ 1.21 (OH)， RMSE为1.05 (CRO) ~ 1.33 （OH）。全球Gc具有显著的空间和季节变化，分布在0.05 ~ 1.48之间，高值区主要分布在非洲高原和澳大利亚。该研究为全球植被Gc制图提供了一种新的方法，这对于理解气候变化下的生态水文过程和预测陆地碳和水循环的命运至关重要。

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Global mapping of canopy conductance from TROPOMI solar-induced chlorophyll fluorescence after differentiating contributions of sunlit and shaded leaves

Global mapping of terrestrial vegetation canopy conductance (G_c) is of great importance for understanding the behavior of terrestrial carbon and water cycles and their interaction mechanisms. Solar-induced chlorophyll fluorescence (SIF) shows great promise in deriving global G_c, yet is hindered by limited capacities in characterizing the SIF-G_c relationship, particularly in high-density vegetation areas, where differentiating the contribution of sunlit and shaded leaf SIF and G_c to canopy matters. Here, we developed a new SIF-G_c model by differentiating the contribution of sunlit and shaded leaves using a coupled “Two-leaf” biosphere model (BEPS-LRC) and the Ball-Berry model, and derived global G_c distribution from 2018 through 2020 with TROPOMI satellite SIF data and eddy covariance flux data from 40 stations. We found that sunlit leaves and shaded leaves have a similar seasonal variation in G_c, but the variation is greater in the former than in the latter, and the differentiation of sunlit and shaded leaves makes SIF better track the seasonal variation of G_c. Moreover, the new model reduces the dependence of canopy SIF-G_c relationship on atmospheric vapor pressure deficit, with the R² of eight biomes greater than 0.5 and 0.4 in sunlit leaves and shaded leaves respectively. In addition, the model improves the accuracy of G_c estimation, with the minimum R² of 0.52 (SAV), the maximum R² of 0.79 (MF and OH), and the slope ranged from 1.04 (CRO) to 1.21 (OH) with the RMSE from 1.05 (CRO) to 1.33 (OH). The global G_c exhibits substantial spatial and seasonal variations, ranging from 0.05 to 1.48, with high values mainly distributed in the African plateau and Australia. This study provides a novel method for mapping global vegetation G_c, which is crucial for understanding the eco-hydrological processes and predicting the fate of terrestrial carbon and water cycles in a changing climate.

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来源期刊

Global and Planetary Change 地学天文-地球科学综合

CiteScore

7.40

自引率

10.30%

发文量

226

审稿时长

63 days

期刊介绍： The objective of the journal Global and Planetary Change is to provide a multi-disciplinary overview of the processes taking place in the Earth System and involved in planetary change over time. The journal focuses on records of the past and current state of the earth system, and future scenarios , and their link to global environmental change. Regional or process-oriented studies are welcome if they discuss global implications. Topics include, but are not limited to, changes in the dynamics and composition of the atmosphere, oceans and cryosphere, as well as climate change, sea level variation, observations/modelling of Earth processes from deep to (near-)surface and their coupling, global ecology, biogeography and the resilience/thresholds in ecosystems. Key criteria for the consideration of manuscripts are (a) the relevance for the global scientific community and/or (b) the wider implications for global scale problems, preferably combined with (c) having a significance beyond a single discipline. A clear focus on key processes associated with planetary scale change is strongly encouraged. Manuscripts can be submitted as either research contributions or as a review article. Every effort should be made towards the presentation of research outcomes in an understandable way for a broad readership.