气候变化领域集成服务门户(CCPortal): Changes in leaf functional traits of rainforest canopy trees associated with an El Nino event in Borneo

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DOI	10.1088/1748-9326/ab2eae
	Changes in leaf functional traits of rainforest canopy trees associated with an El Nino event in Borneo
	Nunes M.H.; Both S.; Bongalov B.; Brelsford C.; Khoury S.; Burslem D.F.R.P.; Philipson C.; Majalap N.; Riutta T.; Coomes D.A.; Cutler M.E.J.
发表日期	2019
ISSN	17489318
卷号	14 期号:8
英文摘要	El Nino events generate periods of relatively low precipitation, low cloud cover and high temperature over the rainforests of Southeast Asia, but their impact on tree physiology remains poorly understood. Here we use remote sensing and functional trait approaches - commonly used to understand plant acclimation to environmental fluctuations - to evaluate rainforest responses to an El Nino event at a site in northern Borneo. Spaceborne measurements (i.e. normalised difference vegetation index calculated from Moderate Resolution Imaging Spectroradiometer data) show the rainforest canopy greened throughout 2015, coinciding with a strengthening of the El Nino event in Sabah, Malaysia, then lost greenness in early 2016, when the El Nino was at its peak. Leaf chemical and structural traits measured for mature leaves of 65 species (104 branches from 99 tree canopies), during and after this El Nino event revealed that chlorophyll and carotenoid concentrations were 35% higher in mid 2015 than in mid 2016. Foliar concentrations of the nutrients N, P, K and Mg did not vary, suggesting the mineralisation and transportation processes were unaffected by the El Nino event. Leaves contained more phenolics, tannins and cellulose but less Ca and lignin during the El Nino event, with concentration shifts varying strongly among species. These changes in functional traits were also apparent in hyperspectral reflectance data collected using a field spectrometer, particularly in the shortwave infrared region. Leaf-level acclimation and leaf turnover could have driven the trait changes observed. We argue that trees were not water limited in the initial phase of the El Nino event, and responded by flushing new leaves, seen in the canopy greening trend and higher pigment concentrations (associated with young leaves); we argue that high evaporative demand and depleted soil water eventually caused leaves to drop in 2016. However, further studies are needed to confirm these ideas. Time-series of vegetation dynamics obtained from space can only be understood if changes in functional traits, as well as the quantity of leaves in canopies, are monitored on the ground. © 2019 The Author(s). Published by IOP Publishing Ltd.
英文关键词	El Nino; ground-based reflectance; leaf greening; leaf trait dynamics; tropical forests
语种	英语
scopus关键词	Precipitation (meteorology); Radiometers; Reflection; Remote sensing; Soil moisture; Spectrometers; Vegetation; EL Nino; Ground based; leaf greening; Leaf traits; Tropical forest; Forestry; canopy architecture; carotenoid; cellulose; chlorophyll; cloud cover; El Nino; functional role; ground-based measurement; high temperature; leaf; lignin; MODIS; NDVI; phenolic compound; physiology; rainforest; tropical forest; Borneo; Forestry; Plants; Reflection; Remote Sensing; Spectrometers; Borneo; East Malaysia; Malaysia; Sabah
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/154457
作者单位	Department of Plant Sciences, Forest Ecology and Conservation Group, University of Cambridge, Cambridge, United Kingdom; Environmental and Rural Science, University of New England, Armidale, NSW 2351, Australia; Department of Biosciences, Canopy Spectral Ecology and Ecophysiology Group, University of Helsinki, Finland; School of Biological Sciences, University of Aberdeen, Aberdeen, AB24 3FX, United Kingdom; Department of Environmental Systems Science, ETH Zurich, Universitatstrasse 16, Zürich, 8092, Switzerland; Sabah Forestry Department, Sandakan, 90009, Malaysia; School of Geography and the Environment, Environmental Change Institute, University of Oxford, Oxford, OX1 3QY, United Kingdom; Geography, School of Social Sciences, University of Dundee, Dundee, DD1 4HN, United Kingdom
推荐引用方式 GB/T 7714	Nunes M.H.,Both S.,Bongalov B.,et al. Changes in leaf functional traits of rainforest canopy trees associated with an El Nino event in Borneo[J],2019,14(8).
APA	Nunes M.H..,Both S..,Bongalov B..,Brelsford C..,Khoury S..,...&Cutler M.E.J..(2019).Changes in leaf functional traits of rainforest canopy trees associated with an El Nino event in Borneo.Environmental Research Letters,14(8).
MLA	Nunes M.H.,et al."Changes in leaf functional traits of rainforest canopy trees associated with an El Nino event in Borneo".Environmental Research Letters 14.8(2019).