DOI: 10.1016/j.foreco.2016.01.023
Scopus记录号: 2-s2.0-84955506040
论文题名: Wood decay in desert riverine environments
作者: Andersen D.C. ; Stricker C.A. ; Nelson S.M.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2016
卷: 365 起始页码: 83
结束页码: 95
语种: 英语
英文关键词: Decomposition
; Dryland river
; Floodplain forest
; Nitrogen
; Riparian
; Woody debris
Scopus关键词: Arid regions
; Banks (bodies of water)
; Budget control
; Carbon
; Climate change
; Cotton
; Cylinders (shapes)
; Debris
; Decomposition
; Ecology
; Ecosystems
; Effluents
; Floods
; Forestry
; Hydrogeology
; Landforms
; Location
; Nitrogen
; Rivers
; Wastewater treatment
; Wood
; Aquatic environments
; Arid and semi-arid regions
; Dryland rivers
; Exponential decay models
; Floodplain forest
; North american deserts
; Riparian
; Woody debris
; Decay (organic)
; Decay
; Forests
; Nitrogen
; Rivers
; Invertebrata
; Populus deltoides
; Populus fremontii
英文摘要: Floodplain forests and the woody debris they produce are major components of riverine ecosystems in many arid and semiarid regions (drylands). We monitored breakdown and nitrogen dynamics in wood and bark from a native riparian tree, Fremont cottonwood (Populus deltoides subsp. wislizeni), along four North American desert streams. We placed locally-obtained, fresh, coarse material [disks or cylinders (~500-2000cm3)] along two cold-desert and two warm-desert rivers in the Colorado River Basin. Material was placed in both floodplain and aquatic environments, and left in situ for up to 12years. We tested the hypothesis that breakdown would be fastest in relatively warm and moist aerobic environments by comparing the time required for 50% loss of initial ash-free dry matter (T50) calculated using exponential decay models incorporating a lag term. In cold-desert sites (Green and Yampa rivers, Colorado), disks of wood with bark attached exposed for up to 12years in locations rarely inundated lost mass at a slower rate (T50=34yr) than in locations inundated during most spring floods (T50=12yr). At the latter locations, bark alone loss mass at a rate initially similar to whole disks (T50=13yr), but which subsequently slowed. In warm-desert sites monitored for 3years, cylinders of wood with bark removed lost mass very slowly (T50=60yr) at a location never inundated (Bill Williams River, Arizona), whereas decay rate varied among aquatic locations (T50=20yr in Bill Williams River; T50=3yr in Las Vegas Wash, an effluent-dominated stream warmed by treated wastewater inflows). Invertebrates had a minor role in wood breakdown except at in-stream locations in Las Vegas Wash. The presence and form of change in nitrogen content during exposure varied among riverine environments. Our results suggest woody debris breakdown in desert riverine ecosystems is primarily a microbial process with rates determined by landscape position, local weather, and especially the regional climate through its effect on the flow regime. The increased warmth and aridity expected to accompany climate change in the North American southwest will likely retard the already slow wood decay process on naturally functioning desert river floodplains. Our results have implications for designing environmental flows to manage floodplain forest wood budgets, carbon storage, and nutrient cycling along regulated dryland rivers. © 2016 Published by Elsevier B.V.. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/65029
Appears in Collections: 影响、适应和脆弱性
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作者单位: U.S. Geological Survey, Fort Collins Science Center, Fort Collins, CO, United States; Bureau of Reclamation, 86-68220, P.O. Box 25007, Denver, CO, United States
Recommended Citation:
Andersen D.C.,Stricker C.A.,Nelson S.M.. Wood decay in desert riverine environments[J]. Forest Ecology and Management,2016-01-01,365