气候变化领域集成服务门户(CCPortal): Ecophysiological adjustments of a pine forest to enhance early spring activity in hot and dry climate

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DOI	10.1088/1748-9326/abc2f9
	Ecophysiological adjustments of a pine forest to enhance early spring activity in hot and dry climate
	Wang H.; Gitelson A.; Sprintsin M.; Rotenberg E.; Yakir D.
发表日期	2020
ISSN	17489318
卷号	15 期号:11
英文摘要	Climate change can impose large offsets between the seasonal cycle of photosynthesis and that in solar radiation and temperature which drive it. Ecophysiological adjustments to such offsets in forests growing under hot and dry conditions are critical for maintaining carbon uptake and survival. Here, we investigate the adjustments that underlie the unusually short and intense early spring productive season, under suboptimal radiation and temperature conditions in a semi-arid pine forest. We used eddy covariance flux, meteorological, and close-range sensing measurements, together with leaf chlorophyll content over four years in a semi-arid pine forest to identify the canopy-scale ecophysiological adjustments to the short active season, and long seasonal drought. The results reveal a range of processes that intricately converge to support the early spring peak (March) in photosynthetic activity, including peaks in light use efficiency, leaf chlorophyll content, increase in the absorption of solar radiation, and high leaf scattering properties (indicating optimizing leaf orientation). These canopy-scale adjustments exploit the tradeoffs between the yet increasing temperature and solar radiation, but the concurrently rapidly diminishing soil moisture. In contrast, during the long dry stressful period with rapidly declining photosynthesis under high and potentially damaging solar radiation, physiological photoprotection was conferred by strongly relaxing the early spring adjustments. The results provide evidence for canopy-scale ecophysiological adjustments, detectable by spectral measurements, that support the survival and productivity of a pine forest under the hot and dry conditions, which may apply to large areas in the Mediterranean and other regions in the next few decades due to the current warming and drying trends. © 2020 The Author(s). Published by IOP Publishing Ltd.
英文关键词	adjustments; Aleppo pine; Monteith assumption; optimum time; photoprotection; semi-arid forest
语种	英语
scopus关键词	Chlorophyll; Climate change; Photosynthesis; Soil moisture; Solar radiation; Absorption of solar radiation; Increasing temperatures; Leaf chlorophyll content; Light use efficiency; Photosynthetic activity; Scattering property; Spectral measurement; Temperature conditions; Forestry; Pinus halepensis
来源期刊	Environmental Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/153483
作者单位	Department of Earth and Planetary Science, Weizmann Institute of Science, Rehovot, 7610001, Israel; School of Natural Resources, University of Nebraska-Lincoln, Lincoln, NE 68583, United States; Israel Institute of Technology (Technion), Haifa, 3200003, Israel; Land Development Authority, Jewish National Fund, Keren Keyemet LeIsrael, Eshtaol, M.P. Shimshon, 99775, Israel
推荐引用方式 GB/T 7714	Wang H.,Gitelson A.,Sprintsin M.,et al. Ecophysiological adjustments of a pine forest to enhance early spring activity in hot and dry climate[J],2020,15(11).
APA	Wang H.,Gitelson A.,Sprintsin M.,Rotenberg E.,&Yakir D..(2020).Ecophysiological adjustments of a pine forest to enhance early spring activity in hot and dry climate.Environmental Research Letters,15(11).
MLA	Wang H.,et al."Ecophysiological adjustments of a pine forest to enhance early spring activity in hot and dry climate".Environmental Research Letters 15.11(2020).