DOI: 10.1002/2017JG004018
Scopus记录号: 2-s2.0-85042234212
论文题名: Soil Moisture Controls the Thermal Habitat of Active Layer Soils in the McMurdo Dry Valleys, Antarctica
作者: Wlostowski A.N. ; Gooseff M.N. ; Adams B.J.
刊名: Journal of Geophysical Research: Biogeosciences
ISSN: 21698953
出版年: 2018
卷: 123, 期: 1 起始页码: 46
结束页码: 59
语种: 英语
英文关键词: climate change
; ecosystems
; freeze/thaw
; nematode
; soil moisture
Scopus关键词: abiotic factor
; abundance
; active layer
; climate change
; environmental gradient
; environmental stress
; freeze-thaw cycle
; freezing
; habitat structure
; heterogeneity
; macroinvertebrate
; moisture content
; numerical model
; regional climate
; soil biota
; soil ecosystem
; soil moisture
; thermodynamics
; warming
; Antarctica
; East Antarctica
; McMurdo Dry Valleys
; Invertebrata
英文摘要: Antarctic soil ecosystems are strongly controlled by abiotic habitat variables. Regional climate change in the McMurdo Dry Valleys is expected to cause warming over the next century, leading to an increase in frequency of freeze-thaw cycling in the soil habitat. Previous studies show that physiological stress associated with freeze-thaw cycling adversely affects invertebrate populations by decreasing abundance and positively selecting for larger body sizes. However, it remains unclear whether or not climate warming will indeed enhance the frequency of annual freeze-thaw cycling and associated physiological stresses. This research quantifies the frequency, rate, and spatial heterogeneity of active layer freezing to better understand how regional climate change may affect active layer soil thermodynamics, and, in turn, affect soil macroinvertebrate communities. Shallow active layer temperature, specific conductance, and soil moisture were observed along natural wetness gradients. Field observations show that the frequency and rate of freeze events are nonlinearly related to freezable soil moisture (θf). Over a 2 year period, soils at θf < 0.080 m3/m3 experienced between 15 and 35 freeze events and froze rapidly compared to soils with θf > 0.080 m3/m3, which experienced between 2 and 6 freeze events and froze more gradually. A numerical soil thermodynamic model is able to simulate observed freezing rates across a range of θf, reinforcing a well-known causal relationship between soil moisture and active layer freezing dynamics. Findings show that slight increases in soil moisture can potentially offset the effect of climate warming on exacerbating soil freeze-thaw cycling. ©2017. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114793
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: Institute of Arctic and Alpine Research, University of Colorado, Boulder, CO, United States; Department of Civil, Environmental, and Architectural Engineering, University of Colorado, Boulder, CO, United States; Department of Biology, Evolutionary Ecology Laboratories, and Monte L. Bean Museum, Brigham Young University, Provo, UT, United States
Recommended Citation:
Wlostowski A.N.,Gooseff M.N.,Adams B.J.. Soil Moisture Controls the Thermal Habitat of Active Layer Soils in the McMurdo Dry Valleys, Antarctica[J]. Journal of Geophysical Research: Biogeosciences,2018-01-01,123(1)