Arid
DOI10.1002/ece3.2074
Photosynthesis and growth reduction with warming are driven by nonstomatal limitations in a Mediterranean semi-arid shrub
Leon-Sanchez, Lupe1; Nicolas, Emilio1; Nortes, Pedro A.1; Maestre, Fernando T.2; Querejeta, Jose I.1
通讯作者Querejeta, Jose I.
来源期刊ECOLOGY AND EVOLUTION
ISSN2045-7758
出版年2016
卷号6期号:9页码:2725-2738
英文摘要

Whereas warming enhances plant nutrient status and photosynthesis in most terrestrial ecosystems, dryland vegetation is vulnerable to the likely increases in evapotranspiration and reductions in soil moisture caused by elevated temperatures. Any warming-induced declines in plant primary production and cover in drylands would increase erosion, land degradation, and desertification. We conducted a four-year manipulative experiment in a semi-arid Mediterranean ecosystem to evaluate the impacts of a similar to 2 degrees C warming on the photosynthesis, transpiration, leaf nutrient status, chlorophyll content, isotopic composition, biomass growth, and postsummer survival of the native shrub Helianthemum squamatum. We predicted that warmed plants would show reduced photosynthetic activity and growth, primarily due to the greater stomatal limitation imposed by faster and more severe soil drying under warming. On average, warming reduced net photosynthetic rates by 36% across the study period. Despite this strong response, warming did not affect stomatal conductance and transpiration. The reduction of peak photosynthetic rates with warming was more pronounced in a drought year than in years with near-average rainfall (75% and 25-40% reductions relative to controls, respectively), with no indications of photosynthetic acclimation to warming through time. Warmed plants had lower leaf N and P contents, delta C-13, and sparser and smaller leaves than control plants. Warming reduced shoot dry mass production by 31%. However, warmed plants were able to cope with large reductions in net photosynthesis, leaf area, and shoot biomass production without changes in postsummer survival rates. Our findings highlight the key role of nonstomatal factors (biochemical and/or nutritional) in reducing net carbon assimilation rates and growth under warming, which has important implications for projections of plant carbon balance under the warmer and drier climatic scenario predicted for drylands worldwide. Projected climate warming over the coming decades could reduce net primary production by about one-third in semi-arid gypsum shrublands dominated by H. squamatum.


英文关键词Climate change dryland ecosystems Helianthemum squamatum leaf trait plasticity plant nutrient status plant survival and growth plant-climate interactions stable isotopes
类型Article
语种英语
国家Spain
收录类别SCI-E
WOS记录号WOS:000376149400008
WOS关键词OXYGEN-ISOTOPE COMPOSITION ; CLIMATE-CHANGE ; TEMPERATE STEPPE ; STOMATAL CONDUCTANCE ; NORTHERN-HEMISPHERE ; TERRESTRIAL PLANTS ; MYCORRHIZAL FUNGI ; CARBON ISOTOPES ; USE EFFICIENCY ; STABLE OXYGEN
WOS类目Ecology ; Evolutionary Biology
WOS研究方向Environmental Sciences & Ecology ; Evolutionary Biology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/192468
作者单位1.CSIC, CEBAS, Campus Univ Espinardo,POB 164, E-30100 Murcia, Spain;
2.Univ Rey Juan Carlos, Dept Biol & Geol, Biodivers & Conservat Unit, Madrid 28933, Spain
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Leon-Sanchez, Lupe,Nicolas, Emilio,Nortes, Pedro A.,et al. Photosynthesis and growth reduction with warming are driven by nonstomatal limitations in a Mediterranean semi-arid shrub[J],2016,6(9):2725-2738.
APA Leon-Sanchez, Lupe,Nicolas, Emilio,Nortes, Pedro A.,Maestre, Fernando T.,&Querejeta, Jose I..(2016).Photosynthesis and growth reduction with warming are driven by nonstomatal limitations in a Mediterranean semi-arid shrub.ECOLOGY AND EVOLUTION,6(9),2725-2738.
MLA Leon-Sanchez, Lupe,et al."Photosynthesis and growth reduction with warming are driven by nonstomatal limitations in a Mediterranean semi-arid shrub".ECOLOGY AND EVOLUTION 6.9(2016):2725-2738.
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