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預(yù)告|GeoInsider 第25期：城鄉(xiāng)梯度揭示了延長(zhǎng)的植被物候期受CO2濃度與溫度的聯(lián)合控制

2020-06-16 12:16 作者:GeoInsider 0人讀過 | 我要投稿

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GeoInsider Webinar

在線講座系列第25期

題目：Urban?rural gradients reveal joint control of elevated CO2 and temperature on extended photosynthetic seasons

Photosynthetic phenology has large effects on the land–atmosphere carbon exchange. Due to limited experimental assessments, a comprehensive understanding of the variations of photosynthetic phenology under future climate and its associated controlling factors is still missing, despite its high sensitivities to climate. Here, we develop an approach that uses cities as natural laboratories, since plants in urban areas are often exposed to higher temperatures and carbon dioxide (CO2) concentrations, which reflect expected future environmental conditions. Using more than 880 urban–rural gradients across the Northern Hemisphere (≥30°?N), combined with concurrent satellite retrievals of Sun-induced chlorophyll fluorescence (SIF) and atmospheric CO2, we investigated the combined impacts of elevated CO2 and temperature on photosynthetic phenology at the large scale. The results showed that, under urban conditions of elevated CO2 and temperature, vegetation photosynthetic activity began earlier (?5.6?±?0.7?d), peaked earlier (?4.9??±?0.9?d) and ended later (4.6?±?0.8?d) than in neighbouring rural areas, with a striking two- to fourfold higher climate sensitivity than greenness phenology. The earlier start and peak of season were sensitive to both the enhancements of CO2 and temperature, whereas the delayed end of season was mainly attributed to CO2 enrichments. We used these sensitivities to project phenology shifts under four Representative Concentration Pathway climate scenarios, predicting that vegetation will have prolonged photosynthetic seasons in the coming two decades. This observationdriven study indicates that realistic urban environments, together with SIF observations, provide a promising method for studying vegetation physiology under future climate change.

報(bào)告人：Dr. Songhan Wang, Nanjing University

? ? ? ? ? ? ?王松寒，南京大學(xué)

時(shí)間：北京時(shí)間 6月19日（周五）上午10:00

? ? ? ? ? ?加州時(shí)間 6月18日（周四）晚上7:00

? ? ? ? ? ?悉尼時(shí)間 6月19日（周五）中午12:00

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Presentation Abstract

Photosynthetic phenology has large effects on the land–atmosphere carbon exchange. Due to limited experimental assessments, a comprehensive understanding of the variations of photosynthetic phenology under future climate and its associated controlling factors is still missing, despite its high sensitivities to climate. Here, we develop an approach that uses cities as natural laboratories, since plants in urban areas are often exposed to higher temperatures and carbon dioxide (CO2) concentrations, which reflect expected future environmental conditions. Using more than 880 urban–rural gradients across the Northern Hemisphere (≥30°?N), combined with concurrent satellite retrievals of Sun-induced chlorophyll fluorescence (SIF) and atmospheric CO2, we investigated the combined impacts of elevated CO2 and temperature on photosynthetic phenology at the large scale. The results showed that, under urban conditions of elevated CO2 and temperature, vegetation photosynthetic activity began earlier (?5.6?±?0.7?d), peaked earlier (?4.9??±?0.9?d) and ended later (4.6?±?0.8?d) than in neighbouring rural areas, with a striking two- to fourfold higher climate sensitivity than greenness phenology. The earlier start and peak of season were sensitive to both the enhancements of CO2 and temperature, whereas the delayed end of season was mainly attributed to CO2 enrichments. We used these sensitivities to project phenology shifts under four Representative Concentration Pathway climate scenarios, predicting that vegetation will have prolonged photosynthetic seasons in the coming two decades. This observationdriven study indicates that realistic urban environments, together with SIF observations, provide a promising method for studying vegetation physiology under future climate change.

Linkage:

Nature Ecology&Evolution論文鏈接：

https://www.nature.com/articles/s41559-019-0931-1

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致謝

本活動(dòng)由GeoInsider主辦，得到全國(guó)地理學(xué)研究生聯(lián)合會(huì)、北京師范大學(xué)地理科學(xué)學(xué)部GEO云講堂、信達(dá)雅科教、環(huán)宇易研科技、世界科研學(xué)術(shù)者團(tuán)隊(duì)(WSRS)等單位的大力支持。