Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/j.soilbio.2011.05.007 |
Bacterial salt tolerance is unrelated to soil salinity across an arid agroecosystem salinity gradient | |
Rousk, Johannes1,2; Elyaagubi, Fathi K.1; Jones, Davey L.1; Godbold, Douglas L.1 | |
通讯作者 | Rousk, Johannes |
来源期刊 | SOIL BIOLOGY & BIOCHEMISTRY |
ISSN | 0038-0717 |
出版年 | 2011 |
卷号 | 43期号:9页码:1881-1887 |
英文摘要 | In arid and semi-arid ecosystems, salinization is a major threat to the productivity of agricultural land. While the influence of other physical and chemical environmental factors on decomposer microorganisms have been intensively studied in soil, the influence of salinity has been less exhaustively assessed. We investigated the influence of soil salinity on soil bacterial communities in soils covering a range of salt levels. We assessed tolerance of the bacterial communities from Libyan agricultural soils forming a salinity gradient to salt (NaCl), by extracting bacterial communities and instantaneously monitoring the concentration-response to added NaCl with the Leucine incorporation technique for bacterial growth. To maximise our ability to detect differences in bacterial salt tolerance between the soils, we also repeated the assessment of bacterial growth tolerance after one month incubation with 1 or 2% added organic matter additions to stimulate microbial growth levels. We could establish clear concentration-response relationships between bacterial growth and soil salinity, demonstrating an accurate assessment of bacterial tolerance. The in situ soil salinity in the studied soils ranged between 0.64 and 2.73 mM Na (electrical conductivities of 0.74-4.12 mS cm(-1): cation exchange capacities of 20-37 mmol(c) kg(-1)) and the bacterial tolerance indicated by the concentration inhibiting 50% of the bacterial growth (EC50) varied between 30 and 100 mM Na or between electrical conductivities of 3.0 and 10.7 mS cm(-1). There was no relationship between in situ soil salinity and the salt tolerance of the soil bacterial communities. Our results suggest that soil salinity was not a decisive factor for bacterial growth, and thus for structuring the decomposer community, in the studied soils. (C) 2011 Elsevier Ltd. All rights reserved. |
英文关键词 | Soil salinity Decomposition Arid soils Salt Tolerance Ecotoxicology Selective pressure Leucine incorporation Bacterial growth Microbial community composition Biomass |
类型 | Article |
语种 | 英语 |
国家 | Wales ; Sweden |
收录类别 | SCI-E |
WOS记录号 | WOS:000294942300015 |
WOS关键词 | INDUCED COMMUNITY TOLERANCE ; MICROBIAL COMMUNITIES ; LEUCINE INCORPORATION ; NITROGEN MINERALIZATION ; METABOLIC QUOTIENT ; ORGANIC-MATTER ; METAL TOXICITY ; PH GRADIENT ; MAIZE STRAW ; FUNGAL |
WOS类目 | Soil Science |
WOS研究方向 | Agriculture |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/170569 |
作者单位 | 1.Bangor Univ, Environm Ctr Wales, Bangor LL57 2UW, Gwynedd, Wales; 2.Lund Univ, Dept Biol, SE-22362 Lund, Sweden |
推荐引用方式 GB/T 7714 | Rousk, Johannes,Elyaagubi, Fathi K.,Jones, Davey L.,et al. Bacterial salt tolerance is unrelated to soil salinity across an arid agroecosystem salinity gradient[J],2011,43(9):1881-1887. |
APA | Rousk, Johannes,Elyaagubi, Fathi K.,Jones, Davey L.,&Godbold, Douglas L..(2011).Bacterial salt tolerance is unrelated to soil salinity across an arid agroecosystem salinity gradient.SOIL BIOLOGY & BIOCHEMISTRY,43(9),1881-1887. |
MLA | Rousk, Johannes,et al."Bacterial salt tolerance is unrelated to soil salinity across an arid agroecosystem salinity gradient".SOIL BIOLOGY & BIOCHEMISTRY 43.9(2011):1881-1887. |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。