DOI: 10.1016/j.foreco.2016.04.049
Scopus记录号: 2-s2.0-84964889434
论文题名: Relationship between photosynthetically active radiation and understory productivity across a forest-savanna continuum
作者: Feltrin R.P. ; Will R.E. ; Meek C.R. ; Masters R.E. ; Waymire J. ; Wilson D.S.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2016
卷: 374 起始页码: 51
结束页码: 60
语种: 英语
英文关键词: Aboveground net primary production
; Fire
; Grass
; Intercepted photosynthetically active radiation
; Woody plants
Scopus关键词: Conservation
; Ecosystems
; Fires
; Fire return intervals
; Grass
; Hemispherical photographs
; Intercepted photosynthetically active radiations
; Net primary production
; Photosynthetically active radiation
; Southern great plains
; Woody plants
; Forestry
; coniferous tree
; ecotone
; fire
; forest ecosystem
; grass
; growing season
; legume
; net primary production
; photosynthetically active radiation
; prairie
; restoration ecology
; savanna
; understory
; vegetation cover
; wildlife management
; woodland
; woody plant
; Great Plains
; Poaceae
英文摘要: Conversion of closed-canopy forests to open woodland and savanna structure is an important objective related to ecosystem restoration and management of wildlife habitat. Our objective was to determine how aboveground net primary production (ANPP) of the understory at the forest-prairie ecotone of the Southern Great Plains, USA is affected by availability and interception of photosynthetically active radiation (PAR) as modified by overstory tree cover. The study site included a continuum from closed-canopy Pinus echinata/Quercus stellata dominated forest to savanna. More open-canopy treatments were created by harvesting and thinning trees in 1984 and implementation of fire return interval between one and four years (1985-2013). During the 2013 growing season, we measured PAR interception by the overstory using repeated hemispherical photographs (fIPARo), calculated total PAR available to the understory (TAPARu), and measured PAR intercepted by the understory (TIPARu) using repeated ceptometer measurements. ANPP of grasses, forbs, legumes, and woody plants in the understory was measured by clip plots at the end of the growing season and correlated to TAPARu and TIPARu. ANPP increased as TAPARu increased (less than 25 g m-2 y-1 in closed-canopy forest to >300 g m-2 y-1 in savanna areas) and dominance within the understory shifted from woody plants to C4 grasses along the forest to savanna continuum. However, the relationship between ANPP per TAPARu shifted lower in the forested treatments (28.9 g ANPP m-2 y-1 at 1486 MJ PAR m-2 y-1) compared to the savanna treatments (66.8 g ANPP m-2 y-1 at 1486 MJ PAR m-2 y-1). In contrast, the relationship between ANPP and TIPARu was consistent across the forest-savanna continuum. The net effect was that where trees occur in greater abundance they exert additional negative effects on ANPP beyond the capture of PAR. Stand level basal area of approximately 10 m2 ha-1 or lower appears sufficient to shift ANPP per TAPARu upwards. © 2016 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/64873
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Natural Resource Ecology and Management, Oklahoma State University, Stillwater, OK, United States; Department of Forest, Rangeland, and Fire Sciences, University of Idaho, Moscow, ID, United States; College of Natural Resources, University of Wisconsin-Stevens Point, Stevens Point, WI, United States; Oklahoma Department of Wildlife Conservation, Clayton, OK, United States; South Central Climate Science Center, University of Oklahoma, Norman, OK, United States
Recommended Citation:
Feltrin R.P.,Will R.E.,Meek C.R.,et al. Relationship between photosynthetically active radiation and understory productivity across a forest-savanna continuum[J]. Forest Ecology and Management,2016-01-01,374