气候变化领域集成服务门户(CCPortal): The light-deficient climates of western Central African evergreen forests

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DOI	10.1088/1748-9326/aaf5d8
	The light-deficient climates of western Central African evergreen forests
	Philippon N.; Cornu G.; Monteil L.; Gond V.; Moron V.; Pergaud J.; Sèze G.; Bigot S.; Camberlin P.; Doumenge C.; Fayolle A.; Ngomanda A.
发表日期	2019
ISSN	17489318
卷号	14 期号:3
英文摘要	Rainfall thresholds under which forests grow in Central Africa are lower than those of Amazonia and southeast Asia. Attention is thus regularly paid to rainfall whose seasonality and interannual variability has been shown to control Central African forests' water balance and photosynthetic activity. Nonetheless, light availability is also recognized as a key factor to tropical forests. Therefore this study aims to explore the light conditions prevailing across Central Africa, and their potential impact on forests' traits. Using satellite estimates of hourly irradiance, we find first that the four main types of diurnal cycles of irradiance extracted translate into different levels of rainfall, evapotranspiration, direct and diffuse light. Then accounting for scale interactions between the diurnal and annual cycles, we show that the daily quantity and quality of light considerably vary across Central African forests during the annual cycle: the uniqueness of western Central Africa and Gabon in particular, with strongly light-deficient climates especially during the main dry season, points out. Lastly, using an original map of terra firme forests, we also show that most of the evergreen forests are located in western Central Africa and Gabon. We postulate that despite mean annual precipitation below 2000 mm yr-1, the light-deficient climates of western Central Africa can harbour evergreen forests because of an extensive low-level cloudiness developing during the June-September main dry season, which strongly reduces the water demand and enhances the quality of light available for tree photosynthesis. These findings pave the way for further analyses of the past and future changes in the light-deficient climates of western Central Africa and the vulnerability of evergreen forests to these changes. © 2019 The Author(s). Published by IOP Publishing Ltd.
英文关键词	central Africa; cloudiness; diurnal cycles; irradiance; tropical forests
语种	英语
scopus关键词	Clouds; Drought; Rain; Central Africa; cloudiness; Diurnal cycle; irradiance; Tropical forest; Forestry; annual variation; climate effect; cloud cover; diurnal variation; evergreen forest; irradiance; light availability; light effect; satellite altimetry; seasonality; threshold; tropical forest; vulnerability; water budget; Amazonia; Gabon; Southeast Asia
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/154675
作者单位	IGE, University of Grenoble Alpes, CNRS, IRD, Grenoble INP, 70 rue de la Physique, Saint Martin d'Hères, F-38400, France; FandS, CIRAD, Montpellier, F-34000, France; Département de Géographie, Université de Laval, 2045 rue de La TerrasseQC, Canada; Aix Marseille Univ, CNRS, IRD, INRA, Coll France, CEREGE, Aix-en-Provence, F-13000, France; IRI, Columbia University, Palisades, United States; Biogeosciences, UBFC, 6 bvld Gabriel, Dijon, F-21000, France; LMD, IPSL, UPMC, CNRS, EP, ENS, 4 place Jussieu, Paris, F-75000, France; Biose Department and TERRA Research Unit, Gembloux Agro-Bio Tech, Université de Liège, Passage des Déportés 2, Gembloux, B-5030, Belgium; Institut de Recherche en Ecologie Tropicale (IRET), BP 13354, Libreville, Gabon, Gabon
推荐引用方式 GB/T 7714	Philippon N.,Cornu G.,Monteil L.,et al. The light-deficient climates of western Central African evergreen forests[J],2019,14(3).
APA	Philippon N..,Cornu G..,Monteil L..,Gond V..,Moron V..,...&Ngomanda A..(2019).The light-deficient climates of western Central African evergreen forests.Environmental Research Letters,14(3).
MLA	Philippon N.,et al."The light-deficient climates of western Central African evergreen forests".Environmental Research Letters 14.3(2019).