Microbial extracellular polymeric substances improve water retention in dryland biological soil crusts

被引：145

作者：

Adessi, Alessandra ^{[1
,2
]}

de Carvalho, Ricardo Cruz ^{[3
]}

De Philippis, Roberto ^{[1
,4
]}

Branquinho, Cristina ^{[3
]}

da Silva, Jorge Marques ^{[5
]}

机构：

[1] Univ Florence, DISPAA, Florence, Italy

[2] ICCOM Natl Res Council, Sesto Fiorentino, Italy

[3] Univ Lisbon, CE3c, Fac Ciencias, Ctr Ecol Evolut & Environm Changes, Lisbon, Portugal

[4] ISE Natl Res Council, Sesto Fiorentino, Italy

[5] Univ Lisbon, BioISI, Fac Ciencias, Lisbon, Portugal

来源：

SOIL BIOLOGY & BIOCHEMISTRY | 2018年 / 116卷

关键词：

Biological soil crusts; Matric potential; Cyanobacteria; Extracellular polymeric substances; Drylands; ARID-LANDS; DESERT; EXOPOLYSACCHARIDES; DESICCATION; EPS; POLYSACCHARIDES;

D O I：

10.1016/j.soilbio.2017.10.002

中图分类号：

S15 [土壤学];

学科分类号：

0903 ; 090301 ;

摘要：

Biological Soil Crusts (BSCs) represent an important part of the living cover in drylands worldwide. BCSs change soil hydrology due to extracellular polymeric substances (EPS)-excreting species of cyanobacteria, dominant members of dryland-BSCs. The presence of EPS allowed matric potential (Psi(m)) to remain unchanged down to 20% water content, whereas, without EPS, Psi(m) started decreasing at 80% water content. The EPS matrix improved the water retaining capacity of soil, suggesting that BSCs would delay onset of restrictive matric potential values due to its larger water holding capacity.

引用

页码：67 / 69

页数：3

共 31 条

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