DOI: 10.1016/j.foreco.2014.04.041
Scopus记录号: 2-s2.0-84901480513
论文题名: Variation in stream organic matter processing among years and benthic habitats in response to forest clearfelling
作者: Burrows R.M. ; Magierowski R.H. ; Fellman J.B. ; Clapcott J.E. ; Munks S.A. ; Roberts S. ; Davies P.E. ; Barmuta L.A.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2014
卷: 327 起始页码: 136
结束页码: 147
语种: 英语
英文关键词: Disturbance
; Forestry
; Headwater stream
; Microbial decomposition
; Organic matter
; Staircase design
Scopus关键词: Biogeochemistry
; Biological materials
; Catchments
; Cellulose
; Design
; Forestry
; Gravel
; Harvesting
; Organic compounds
; Reforestation
; Sediments
; Stairs
; Temperature
; Timber
; Biological materials
; Bacterial carbon production
; Cellulose decomposition
; Disturbance
; Headwater stream
; Microbial decomposition
; Organic matter processing
; Spatial configuration
; Tasmania , Australia
; Benthic habitats
; Clear-felling
; Ecosystems
; Forestry
; abundance
; bacterium
; benthic environment
; clearcutting
; disturbance
; evergreen forest
; gravel
; headwater
; microbial activity
; organic matter
; regeneration
; streamwater
; timber harvesting
; Cellulose
; Design
; Ecosystems
; Forestry
; Forests
; Harvesting
; Organic Compounds
; Organic Matter
; Reforestation
; Sediments
; Temperature
; Decay
; Rivers
; Structural Design
; Australia
; Tasmania
英文摘要: We assessed rates of organic matter (OM) processing in coarse gravel and fine benthic sediment, along with water temperature, in four clearfell harvested and two undisturbed headwater streams flowing through wet eucalypt forest in southern Tasmania, Australia. Clearfell forestry in Tasmanian wet eucalypt forest involves felling of all timber followed by a high intensity regeneration burn to provide a receptive mineral seedbed for seedling growth. Bacterial carbon production and cellulose decomposition potential (together referred to as OM processing) were measured seasonally 3-5. years before and 2-4. years after harvesting in each stream. We employed a staircase design (staggered harvesting treatments) within a multiple before-after control-impact design to distinguish harvesting effects from natural variation. Clearfell harvesting raised the yearly mean water temperature by between 0.25. °C and 0.94. °C, and raised the maximum water temperature by between 0.84 and 1.6. °C. Rates of cellulose decomposition were not significantly correlated with sediment temperature but bacterial carbon production showed weak, significant correlations with temperature in fine (r=0.20, P=0.01, n=137) and coarse gravel sediment (r=0.39, P<. 0.001, n=137). The response in OM processing to clearfell harvesting differed between years and among benthic habitats. In coarse gravel habitat, there was a significant decrease in rates of cellulose decomposition potential in the 2nd and 4th year after harvesting, and a significant decrease in bacterial carbon production in the 3rd year after harvesting. However, we found a significant increase in rates of bacterial carbon production of fine sediment habitat in the 2nd and 4th year after harvesting. The contrasting response of OM processing between habitats indicates that habitat-specific changes occur after clearfell harvesting, which inhibit attempts to quantitatively predict downstream cumulative effects. Scaling up the habitat-specific responses will not only require estimates of the relative abundances of the distinct habitats, but may also require research into how different spatial configurations of habitats may affect reach- and catchment-scale estimates of OM processing. © 2014 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/65885
Appears in Collections: 影响、适应和脆弱性
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作者单位: School of Biological Sciences, University of Tasmania, Hobart, Tasmania, Australia; CRC for Forestry, Hobart, Tasmania, Australia; Department of Forest Ecology and Management, Swedish University of Agricultural Sciences (SLU), Umeå, Sweden; School of Arts and Sciences, University of Alaska Southeast, Juneau, AK, United States; Cawthron Institute, Nelson, New Zealand; Forest Practices Authority, Hobart, Tasmania, Australia; Forestry Tasmania, Hobart, Tasmania, Australia
Recommended Citation:
Burrows R.M.,Magierowski R.H.,Fellman J.B.,et al. Variation in stream organic matter processing among years and benthic habitats in response to forest clearfelling[J]. Forest Ecology and Management,2014-01-01,327