Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/j.soilbio.2006.03.025 |
Soil carbon turnover in the McMurdo Dry Valleys, Antarctica | |
Barrett, J. E.; Virginia, R. A.; Parsons, A. N.; Wall, D. H. | |
通讯作者 | Barrett, J. E. |
会议名称 | Workshop on Synthesis of Soil Biodiversity and Ecosystem Functioning in Victoria Land, Antarctica |
会议日期 | APR, 2005 |
会议地点 | Jekyll Isl, GA |
英文摘要 | Terrestrial ecosystems of the Antarctic Dry Valleys are among the most inhospitable soil environments on Earth due to climate and substrate limitations over biota. These ecosystems present a challenge to understanding controls over carbon (C) cycling because likely sources of organic matter are 10(2)-10(4) yrs old and in situ soil respiration is typically less than 1.0 mu mol CO(2) m(-2) s(-1). In this paper we describe an analytical approach to characterize kinetic pools of labile and recalcitrant soil C, and estimate C turnover in dry valley soils based upon these descriptions. Rate parameters for C turnover were derived from laboratory incubations conducted under a range of soil moistures and temperatures. We developed a C flux and reservoir model using these rate parameters along with published estimates of internal C transformations in soil microbial ecosystems, and a previously described primary production (NPP) model for Antarctic endolithic communities. We found that decomposition in 120 d incubations was well described by double-exponential rate kinetics, and that temperature, moisture and substrate availability significantly influenced observed rates of soil respiration. Simulations of soil C cycling based upon these parameters produced initially high rates of soil respiration following inputs of external organic matter, with mean residence times for C of 10-60 yrs. Soil organic C content equilibrated at 44-140% of observed levels within 1000 yrs. Simulations of equilibrium C were sensitive to NPP, microbial efficiency (Y), and the distribution of C inputs into labile and passive pools, indicating that more thorough investigation of microbial influence over the C cycle in dry valley soils is necessary. (c) 2006 Elsevier Ltd. All rights reserved. |
英文关键词 | Antarctic Dry Valleys carbon cycling soil organic matter soil respiration |
来源出版物 | SOIL BIOLOGY & BIOCHEMISTRY |
ISSN | 0038-0717 |
出版年 | 2006 |
卷号 | 38 |
期号 | 10 |
页码 | 3065-3082 |
出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
类型 | Article;Proceedings Paper |
语种 | 英语 |
国家 | USA |
收录类别 | SCI-E ; CPCI-S |
WOS记录号 | WOS:000241585600007 |
WOS关键词 | SOUTHERN VICTORIA LAND ; CRYPTOENDOLITHIC MICROBIAL COMMUNITY ; GLOBAL CLIMATE-CHANGE ; ORGANIC-MATTER ; TAYLOR VALLEY ; TEMPERATURE-DEPENDENCE ; COLD DESERT ; CONTINENTAL ANTARCTICA ; GRASSLAND SOILS ; EARLY HOLOCENE |
WOS类目 | Soil Science |
WOS研究方向 | Agriculture |
资源类型 | 会议论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/296275 |
作者单位 | (1)Dartmouth Coll, Environm Studies Program, Hanover, NH 03755 USA;(2)Colorado State Univ, Nat Resource Ecol Lab, Ft Collins, CO 80523 USA |
推荐引用方式 GB/T 7714 | Barrett, J. E.,Virginia, R. A.,Parsons, A. N.,et al. Soil carbon turnover in the McMurdo Dry Valleys, Antarctica[C]:PERGAMON-ELSEVIER SCIENCE LTD,2006:3065-3082. |
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