Arid
DOI10.5194/bg-11-6855-2014
How drought severity constrains gross primary production(GPP) and its partitioning among carbon pools in a Quercus ilex coppice?
Rambal, S.1,5; Lempereur, M.1,6; Limousin, J. M.2; Martin-StPaul, N. K.1,3,7; Ourcival, J. M.1; Rodriguez-Calcerrada, J.4
通讯作者Rambal, S.
来源期刊BIOGEOSCIENCES
ISSN1726-4170
EISSN1726-4189
出版年2014
卷号11期号:23页码:6855-6869
英文摘要

The partitioning of photosynthates toward biomass compartments plays a crucial role in the carbon (C) sink function of forests. Few studies have examined how carbon is allocated toward plant compartments in drought-prone forests. We analyzed the fate of gross primary production (GPP) in relation to yearly water deficit in an old evergreen Mediterranean Quercus ilex coppice severely affected by water limitations. Carbon fluxes between the ecosystem and the atmosphere were measured with an eddy co-variance flux tower running continuously since 2001. Discrete measurements of litterfall, stem growth and f(APAR) allowed us to derive annual productions of leaves, wood, flowers and acorns, and an isometric relationship between stem and belowground biomass has been used to estimate perennial belowground growth. By combining eddy covariance fluxes with annual net primary productions (NPP), we managed to close a C budget and derive values of autotrophic, heterotrophic respirations and carbon-use efficiency (CUE; the ratio between NPP and GPP). Average values of yearly net ecosystem production (NEP), GPP and R-eco were 282, 1259 and 977 g C m(-2). The corresponding aboveground net primary production (ANPP) components were 142.5, 26.4 and 69.6 g C m(-2) for leaves, reproductive effort (flowers and fruits) and stems, respectively. NEP, GPP and R-eco were affected by annual water deficit. Partitioning to the different plant compartments was also impacted by drought, with a hierarchy of responses going from the most affected - the stem growth - to the least affected - the leaf production. The average CUE was 0.40, which is well in the range for Mediterranean-type forest ecosystems. CUE tended to decrease less drastically in response to drought than GPP and NPP did, probably due to drought acclimation of autotrophic respiration. Overall, our results provide a baseline for modeling the inter-annual variations of carbon fluxes and allocation in this widespread Mediterranean ecosystem, and they highlight the value of maintaining continuous experimental measurements over the long term.


类型Article
语种英语
国家France ; USA ; Spain ; Brazil
收录类别SCI-E
WOS记录号WOS:000346357100023
WOS关键词EVERGREEN MEDITERRANEAN FOREST ; NET ECOSYSTEM EXCHANGE ; PINUS-RADIATA FOLIAGE ; FINE-ROOT BIOMASS ; CLIMATE-CHANGE ; CONSTANT FRACTION ; CULTIVATED PLANTS ; NITROGEN STRESS ; USE EFFICIENCY ; NEGEV DESERT
WOS类目Ecology ; Geosciences, Multidisciplinary
WOS研究方向Environmental Sciences & Ecology ; Geology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/181074
作者单位1.Univ Montpellier 3, Univ Montpellier, CNRS, Ctr Ecol Fonctionnelle & Evolut CEFE,UMR5175, F-34293 Montpellier 5, France;
2.Univ New Mexico, Dept Biol, Albuquerque, NM 87131 USA;
3.CNRS, Lab Ecol Systmat & Evolut, F-91405 Orsay, France;
4.Univ Politecn Madrid, ETSI Montes, Grp Invest Genet & Fisiol Forestal, E-28040 Madrid, Spain;
5.Univ Fed Lavras, Dept Biol, BR-37200000 Lavras, MG, Brazil;
6.Agence Environm & Maitrise Energie 20, F-49004 Angers 01, France;
7.INRA, URFM, UR629, Domaine St Paul,Site Agroparc, F-84914 Avignon 9, France
推荐引用方式
GB/T 7714
Rambal, S.,Lempereur, M.,Limousin, J. M.,et al. How drought severity constrains gross primary production(GPP) and its partitioning among carbon pools in a Quercus ilex coppice?[J],2014,11(23):6855-6869.
APA Rambal, S.,Lempereur, M.,Limousin, J. M.,Martin-StPaul, N. K.,Ourcival, J. M.,&Rodriguez-Calcerrada, J..(2014).How drought severity constrains gross primary production(GPP) and its partitioning among carbon pools in a Quercus ilex coppice?.BIOGEOSCIENCES,11(23),6855-6869.
MLA Rambal, S.,et al."How drought severity constrains gross primary production(GPP) and its partitioning among carbon pools in a Quercus ilex coppice?".BIOGEOSCIENCES 11.23(2014):6855-6869.
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