DOI: 10.1007/s10533-016-0199-3
Scopus记录号: 2-s2.0-84961199887
论文题名: Contrasting effects of winter snowpack and soil frost on growing season microbial biomass and enzyme activity in two mixed-hardwood forests
作者: Sorensen P.O. ; Templer P.H. ; Finzi A.C.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2016
卷: 128, 期: 2018-01-02 起始页码: 141
结束页码: 154
语种: 英语
英文关键词: Harvard Forest extracellular enzyme
; Hubbard Brook
; Snow removal
; Soil frost
; Winter climate change
Scopus关键词: biogeochemical cycle
; biomass
; climate change
; enzyme activity
; forest ecosystem
; growing season
; microbial activity
; mixed forest
; phenology
; respiration
; snowmelt
; snowpack
; soil temperature
; temperate forest
; Hubbard Brook Experimental Forest
; New Hampshire
; United States
英文摘要: Winter is recognized as an important time for microbial activity that influences biogeochemical cycles. The onset of the winter snowpack in temperate hardwood ecosystems has been and will continue to be delayed over the next century. The decline in snowpack results in more soil freeze–thaw events and lower winter soil temperatures. Understanding microbial responses to varying snowpack conditions is important to understanding the effect of climate change on forest ecosystems. To this end, we removed snow to simulate a thinner, more ephemeral snowpack at two sites in the northeastern US, Harvard Forest (MA) and Hubbard Brook Experimental Forest (NH). We then measured microbial and exoenzyme activity in soils following snowmelt and three additional time points across the growing season. We found that microbial and exoenzyme activity were both positively correlated with the depth and duration of the snowpack at each site. The depth and duration of soil frost were negatively correlated with microbial biomass, exoenzyme activity and respiration, but only at Harvard Forest and not at Hubbard Brook. At both sites the changes in microbial and exoenzyme activity were transient and did not persist into the growing season past tree leaf-out. While it is possible that reductions in the snowpack and changes to microbial activity in the early spring may lead to asynchrony in the phenology of microbial relative to plant activity, it is at present uncertain whether and over what time scale this asynchrony may affect other forest ecosystem processes. © 2016, Springer International Publishing Switzerland. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83410
Appears in Collections: 气候减缓与适应 气候变化事实与影响
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作者单位: Department of Biology, Boston University, 5 Cummington Mall, Boston, MA, United States
Recommended Citation:
Sorensen P.O.,Templer P.H.,Finzi A.C.. Contrasting effects of winter snowpack and soil frost on growing season microbial biomass and enzyme activity in two mixed-hardwood forests[J]. Biogeochemistry,2016-01-01,128(2018-01-02)