GSTDTAP  > 气候变化
DOI10.1111/gcb.14788
Effects of climate warming on Sphagnum photosynthesis in peatlands depend on peat moisture and species-specific anatomical traits
Jassey, Vincent E. J.1,2,3; Signarbieux, Constant2,3,4
2019-09-09
发表期刊GLOBAL CHANGE BIOLOGY
ISSN1354-1013
EISSN1365-2486
出版年2019
卷号25期号:11页码:3859-3870
文章类型Article
语种英语
国家France; Switzerland
英文摘要

Climate change will influence plant photosynthesis by altering patterns of temperature and precipitation, including their variability and seasonality. Both effects may be important for peatlands as the carbon (C) sink potential of these ecosystems depends on the balance between plant C uptake through photosynthesis and microbial decomposition. Here, we show that the effect of climate warming on Sphagnum community photosynthesis toggles from positive to negative as the peatland goes from rainy to dry periods during summer. More particularly, we show that mechanisms of compensation among the dominant Sphagnum species (Sphagnum fallax and Sphagnum medium) stabilize the average photosynthesis and productivity of the Sphagnum community during summer despite rising temperatures and frequent droughts. While warming had a negligible effect on S. medium photosynthetic capacity (A(max)) during rainy periods, A(max) of S. fallax increased by 40%. On the opposite, warming exacerbated the negative effects of droughts on S. fallax with an even sharper decrease of its A(max) while S. medium A(max) remained unchanged. S. medium showed a remarkable resistance to droughts due to anatomical traits favouring its water holding capacity. Our results show that different phenotypic plasticity among dominant Sphagnum species allow the community to cope with rising temperatures and repeated droughts, maintaining similar photosynthesis and productivity over summer in warmed and control conditions. These results are important because they provide information on how soil water content may modulate the effects of climate warming on Sphagnum productivity in boreal peatlands. It further confirms the transitory nature of warming-induced photosynthesis benefits in boreal systems and highlights the vulnerability of the ecosystem to excess warming and drying.


英文关键词climate change extreme events net photosynthesis phenotypic plasticity soil water content Sphagnum fallax Sphagnum magellanicum temperate and boreal ecosystem trait plasticity
领域气候变化 ; 资源环境
收录类别SCI-E
WOS记录号WOS:000485960200001
WOS关键词DESICCATION TOLERANCE ; EXTREME PRECIPITATION ; WATER-CONTENT ; DROUGHT ; GROWTH ; RESPONSES ; TEMPERATURE ; PERFORMANCE ; COMMUNITY ; WINTER
WOS类目Biodiversity Conservation ; Ecology ; Environmental Sciences
WOS研究方向Biodiversity & Conservation ; Environmental Sciences & Ecology
引用统计
文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/186968
专题气候变化
资源环境科学
作者单位1.Univ Toulouse, INPT, CNRS, Lab Ecol Fonct & Environm, Toulouse, France;
2.Ecole Polytech Fed Lausanne, Ecol Syst Lab ECOS, Sch Architecture Civil & Environm Engn ENAC, Lausanne, Switzerland;
3.WSL Swiss Fed Inst Forest Snow & Landscape Res, Lausanne, Switzerland;
4.Univ Neuchatel, Inst Geog, Neuchatel, Switzerland
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GB/T 7714
Jassey, Vincent E. J.,Signarbieux, Constant. Effects of climate warming on Sphagnum photosynthesis in peatlands depend on peat moisture and species-specific anatomical traits[J]. GLOBAL CHANGE BIOLOGY,2019,25(11):3859-3870.
APA Jassey, Vincent E. J.,&Signarbieux, Constant.(2019).Effects of climate warming on Sphagnum photosynthesis in peatlands depend on peat moisture and species-specific anatomical traits.GLOBAL CHANGE BIOLOGY,25(11),3859-3870.
MLA Jassey, Vincent E. J.,et al."Effects of climate warming on Sphagnum photosynthesis in peatlands depend on peat moisture and species-specific anatomical traits".GLOBAL CHANGE BIOLOGY 25.11(2019):3859-3870.
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