Arid
DOI10.1111/j.1365-2486.2010.02285.x
Impact of rainfall manipulations and biotic controls on soil respiration in Mediterranean and desert ecosystems along an aridity gradient
Talmon, Yiftach1; Sternberg, Marcelo2; Gruenzweig, Jose M.1
通讯作者Gruenzweig, Jose M.
来源期刊GLOBAL CHANGE BIOLOGY
ISSN1354-1013
EISSN1365-2486
出版年2011
卷号17期号:2页码:1108-1118
英文摘要

Spatially heterogeneous ecosystems form a majority of land types in the vast drylands of the globe. To evaluate climate-change effects on CO2 fluxes in such ecosystems, it is critical to understand the relative responses of each ecosystem component (microsite). We investigated soil respiration (R-s) at four sites along an aridity gradient (90-780 mm mean annual precipitation, MAP) during almost 2 years. In addition, R-s was measured in rainfall manipulations plots at the two central sites where similar to 30% droughting and similar to 30% water supplementation treatments were used over 5 years. Annual R-s was higher by 23% under shrub canopies compared with herbaceous gaps between shrubs, but R-s at both microsites responded similarly to rainfall reduction. Decreasing precipitation and soil water content along the aridity gradient and across rainfall manipulations resulted in a progressive decline in R-s at both microsites, i.e. the drier the conditions, the larger was the effect of reduction in water availability on R-s. Annual R-s on the ecosystem scale decreased at a slope of 256/MAP g C m-2 yr-1 mm-1 (r2=0.97). The reduction in R-s amounted to 77% along the aridity gradient and to 16% across rainfall manipulations. Soil organic carbon (SOC) decreased with declining precipitation, and variation in SOC stocks explained 77% of the variation in annual R-s across sites, rainfall manipulations and microsites. This study shows that rainfall manipulations over several years are a useful tool for experimentally predicting climate-change effects on CO2 fluxes for time scales (such as approximated by aridity gradients) that are beyond common research periods. Rainfall reduction decreases rates of R-s not only by lowering biological activity, but also by drastically reducing shrub cover. We postulate that future climate change in heterogeneous ecosystems, such as Mediterranean and deserts shrublands will have a major impact on R-s by feedbacks through changes in vegetation structure.


英文关键词climate change CO2 fluxes CO2 pulses droughting Mediterranean shrubland shrub microsite soil CO2 efflux soil organic carbon stock supplemented rainfall
类型Article
语种英语
国家Israel
收录类别SCI-E
WOS记录号WOS:000285878000035
WOS关键词CLIMATE-CHANGE ; PRECIPITATION PULSES ; GRASSLAND ECOSYSTEM ; CARBON SEQUESTRATION ; WATER AVAILABILITY ; CO2 EFFLUX ; OAK FOREST ; FLUXES ; RESPONSES ; MINERALIZATION
WOS类目Biodiversity Conservation ; Ecology ; Environmental Sciences
WOS研究方向Biodiversity & Conservation ; Environmental Sciences & Ecology
来源机构Hebrew University of Jerusalem
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/168340
作者单位1.Hebrew Univ Jerusalem, Robert H Smith Fac Agr Food & Environm, Robert H Smith Inst Plant Sci & Genet Agr, IL-76100 Rehovot, Israel;
2.Tel Aviv Univ, Fac Life Sci, Dept Mol Biol & Ecol Plants, IL-69978 Tel Aviv, Israel
推荐引用方式
GB/T 7714
Talmon, Yiftach,Sternberg, Marcelo,Gruenzweig, Jose M.. Impact of rainfall manipulations and biotic controls on soil respiration in Mediterranean and desert ecosystems along an aridity gradient[J]. Hebrew University of Jerusalem,2011,17(2):1108-1118.
APA Talmon, Yiftach,Sternberg, Marcelo,&Gruenzweig, Jose M..(2011).Impact of rainfall manipulations and biotic controls on soil respiration in Mediterranean and desert ecosystems along an aridity gradient.GLOBAL CHANGE BIOLOGY,17(2),1108-1118.
MLA Talmon, Yiftach,et al."Impact of rainfall manipulations and biotic controls on soil respiration in Mediterranean and desert ecosystems along an aridity gradient".GLOBAL CHANGE BIOLOGY 17.2(2011):1108-1118.
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