Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/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
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ISSN | 0038-0717 |
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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