Arid
DOI10.1016/j.soilbio.2008.03.022
Enzymatic activities and microbial communities in an Antarctic dry valley soil: Responses to C and N supplementation
Hopkins, D. W.1,2; Sparrow, A. D.3; Shillam, L. L.2; English, L. C.2; Dennis, P. G.1,2; Novis, P.4; Elberling, B.5,6; Gregorich, E. G.7; Greenfield, L. G.8
通讯作者Hopkins, D. W.
来源期刊SOIL BIOLOGY & BIOCHEMISTRY
ISSN0038-0717
出版年2008
卷号40期号:9页码:2130-2136
英文摘要

The soils of the Antarctic dry valleys are exposed to extremely dry and cold conditions. Nevertheless, they contain small communities of micro-organisms that contribute to the biogeochemical transformations of the bioelements, albeit at slow rates. We have determined the dehydrogenase, P-glucosidase, acid and alkaline phosphatase and arylsulphatase activities and the rates of respiration (CO(2) production) in laboratory assays of soils collected from a field experiment in an Antarctic dry valley. The objective of the field experiment was to test the responses of the soil microbial community to additions of C and N in simple (glucose and NH(4)Cl) and complex forms (glycine and lacustrine detritus from the adjacent lake comprising principally cyanobacterial necromass). The soil samples were taken 3 years after the experimental treatments had been applied. In unamended soil, all enzyme activities and respiration were detected indicating that the enzymatic capacity to mineralize organic C, P and S compounds existed in the soil, despite the very low organic matter content. Relative to the control (unamended soil), respiration was significantly increased by all the experimental additions of C and N except the smallest NH(4)Cl addition (1 mg N g(-1) soil) and the smallest detritus addition (1.5 mg C g(-1) soil and 0.13 mg N g(-1) soil). The activities of all enzymes except dehydrogenase were increased by C and combined large C (10 mg C g-1 soil) and N additions, but either unchanged or diminished by addition of either N only or N (up to 10 mg N g-1 soil) with only small C (1 mg C g-1 soil) additions in the form of glucose and NH(4)Cl. This suggests that in the presence of a large amount of N, the C supply for enzyme biosynthesis was limited. When normalized with respect to soil respiration, only arylsulphatase per unit of respiration showed a significant increase with C and N additions as glucose and NH(4)Cl, consistent with S limitation when C and N limitations have been alleviated. Based on the positive responses of enzyme activity, detritus appeared to provide either conditions or resources which led to a larger biological response than a similar amount of C and more N added in the form of defined compounds (glucose, NH(4)Cl or glycine). Assessment of the soil microbial community by ester-linked fatty acid (ELFA) analysis provided no evidence of changes in the community structure as a result of the C and N supplementation treatments. Thus the respiration and enzyme activity responses to supplementation occurred in an apparently structurally stable or unresponsive microbial community. (C) 2008 Elsevier Ltd. All rights reserved.


英文关键词acid phosphatase alkaline phosphatase Antarctica arylsulphatase dehydrogenase ester-linked fatty acids soil respiration beta-glucosidase
类型Article
语种英语
国家Scotland ; USA ; New Zealand ; Denmark ; Norway ; Canada
收录类别SCI-E
WOS记录号WOS:000259341500009
WOS关键词CHLOROPHYLL-A FLUORESCENCE ; SOUTHERN VICTORIA LAND ; TAYLOR VALLEY ; ORGANIC-MATTER ; DESERT ; PRODUCTIVITY ; VEGETATION ; RESOURCES ; ECOSYSTEM ; EXCHANGE
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/2XILL650/159208
作者单位1.Scottish Crop Res Inst, Dundee DD2 5DA, Scotland;
2.Univ Stirling, Sch Biol & Environm Sci, Stirling FK9 4LA, Scotland;
3.Univ Nevada, Dept Nat Resources & Environm Sci, Reno, NV 89512 USA;
4.Manaaki Whenua Landcare Res, Lincoln 8152, New Zealand;
5.Univ Copenhagen, Inst Geog & Geol, DK-1350 Copenhagen K, Denmark;
6.Univ Ctr Svalbard, Longyearbyen, Norway;
7.Agr & Agri Food Canada, Cent Expt Farm, Ottawa, ON K1A 0C6, Canada;
8.Univ Canterbury, Sch Biol Sci, Christchurch 8020, New Zealand
推荐引用方式
GB/T 7714
Hopkins, D. W.,Sparrow, A. D.,Shillam, L. L.,et al. Enzymatic activities and microbial communities in an Antarctic dry valley soil: Responses to C and N supplementation[J],2008,40(9):2130-2136.
APA Hopkins, D. W..,Sparrow, A. D..,Shillam, L. L..,English, L. C..,Dennis, P. G..,...&Greenfield, L. G..(2008).Enzymatic activities and microbial communities in an Antarctic dry valley soil: Responses to C and N supplementation.SOIL BIOLOGY & BIOCHEMISTRY,40(9),2130-2136.
MLA Hopkins, D. W.,et al."Enzymatic activities and microbial communities in an Antarctic dry valley soil: Responses to C and N supplementation".SOIL BIOLOGY & BIOCHEMISTRY 40.9(2008):2130-2136.
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