Arid
DOI10.1038/ismej.2014.47
Habitat stress initiates changes in composition, CO2 gas exchange and C-allocation as life traits in biological soil crusts
Colesie, Claudia1; Green, T. G. Allan2,3; Haferkamp, Ilka4; Buedel, Burkhard1
通讯作者Colesie, Claudia
来源期刊ISME JOURNAL
ISSN1751-7362
EISSN1751-7370
出版年2014
卷号8期号:10页码:2104-2115
英文摘要

Biological soil crusts (BSC) are the dominant functional vegetation unit in some of the harshest habitats in the world. We assessed BSC response to stress through changes in biotic composition, CO2 gas exchange and carbon allocation in three lichen-dominated BSC from habitats with different stress levels, two more extreme sites in Antarctica and one moderate site in Germany. Maximal net photosynthesis (NP) was identical, whereas the water content to achieve maximal NP was substantially lower in the Antarctic sites, this apparently being achieved by changes in biomass allocation. Optimal NP temperatures reflected local climate. The Antarctic BSC allocated fixed carbon (tracked using (CO2)-C-14) mostly to the alcohol soluble pool (low-molecular weight sugars, sugar alcohols), which has an important role in desiccation and freezing resistance and antioxidant protection. In contrast, BSC at the moderate site showed greater carbon allocation into the polysaccharide pool, indicating a tendency towards growth. The results indicate that the BSC of the more stressed Antarctic sites emphasise survival rather than growth. Changes in BSC are adaptive and at multiple levels and we identify benefits and risks attached to changing life traits, as well as describing the ecophysiological mechanisms that underlie them.


英文关键词Antarctica carbon allocation gas exchange lichens life traits net photosynthesis
类型Article
语种英语
国家Germany ; Spain ; New Zealand
收录类别SCI-E
WOS记录号WOS:000342764600013
WOS关键词WATER-VAPOR UPTAKE ; GROWTH-RATES ; LICHEN ; DESERT ; LAND ; PHOTOSYNTHESIS ; CYCLES ; CARBON ; FIELD ; ECOPHYSIOLOGY
WOS类目Ecology ; Microbiology
WOS研究方向Environmental Sciences & Ecology ; Microbiology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/182834
作者单位1.Univ Kaiserslautern, Dept Plant Ecol & Systemat, D-67663 Kaiserslautern, Germany;
2.Univ Complutense, Dept Biol Vegetal 2, E-28040 Madrid, Spain;
3.Univ Waikato, Dept Sci Biol, Hamilton, New Zealand;
4.Univ Kaiserslautern, Dept Plant Physiol, D-67663 Kaiserslautern, Germany
推荐引用方式
GB/T 7714
Colesie, Claudia,Green, T. G. Allan,Haferkamp, Ilka,et al. Habitat stress initiates changes in composition, CO2 gas exchange and C-allocation as life traits in biological soil crusts[J],2014,8(10):2104-2115.
APA Colesie, Claudia,Green, T. G. Allan,Haferkamp, Ilka,&Buedel, Burkhard.(2014).Habitat stress initiates changes in composition, CO2 gas exchange and C-allocation as life traits in biological soil crusts.ISME JOURNAL,8(10),2104-2115.
MLA Colesie, Claudia,et al."Habitat stress initiates changes in composition, CO2 gas exchange and C-allocation as life traits in biological soil crusts".ISME JOURNAL 8.10(2014):2104-2115.
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