DOI: 10.1016/j.foreco.2015.06.033
Scopus记录号: 2-s2.0-84945467723
论文题名: Fertilization increases sensitivity of canopy stomatal conductance and transpiration to throughfall reduction in an 8-year-old loblolly pine plantation
作者: Bartkowiak S.M. ; Samuelson L.J. ; McGuire M.A. ; Teskey R.O.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2015
卷: 354 起始页码: 87
结束页码: 96
语种: 英语
英文关键词: Drought
; Hydraulic conductance
; Leaf area index
; Pinus taeda
; Sap flow
Scopus关键词: Climate change
; Drought
; Evapotranspiration
; Plants (botany)
; Productivity
; Soils
; Transpiration
; Canopy stomatal conductance
; Hydraulic conductance
; Leaf Area Index
; Loblolly pine (pinus taeda l.)
; Loblolly pine plantations
; Pinus taeda
; Sap flow
; Vapor pressure deficit
; Forestry
; climate change
; coniferous tree
; drought
; economic activity
; hydraulic conductivity
; leaf area index
; sap flow
; stomatal conductance
; throughfall
; transpiration
; water level
; United States
; Pinus taeda
英文摘要: Loblolly pine (Pinus taeda L.) is the most important plantation species in the southeastern United States and therefore reductions in productivity associated with climate change may have significant economic impacts. To better understand the potential impact of drought on loblolly pine productivity, we studied the combined effects of reduced water availability and soil fertility on transpiration and canopy stomatal conductance (GS) over one year in an 8-year-old loblolly pine plantation by applying a throughfall treatment (ambient versus an approximate 30% reduction in throughfall) and a fertilization treatment (no fertilization versus one-time fertilization with N, P, K and micronutrients). We hypothesized that stomatal behavior would regulate water loss under a throughfall reduction treatment and the response would be greater under fertilization, due to an increase in leaf area index. Significant interactions between treatments indicated lower average monthly transpiration per unit ground area (EG) and per unit leaf area (EL), lower whole-plant hydraulic conductance, and lower average monthly midday GS in response to throughfall reduction only in the fertilized treatment, most likely due to increases in the leaf-to-sapwood area ratio in addition to isohydric regulation of water loss. In the throughfall reduction treatment but not the ambient throughfall treatment, reference GS (at vapor pressure deficit=1kPa, GSref) was significantly related to soil relative extractable water (REW) to a 0.6m soil depth, and sensitivity of GSref to REW was greater when combined with fertilization. These results indicate that the influence of drought on canopy-level processes of loblolly pine will be greater with fertilization. © 2015 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/65312
Appears in Collections: 影响、适应和脆弱性
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作者单位: School of Forestry and Wildlife Sciences, Auburn University, Auburn, AL, United States; Warnell School of Forestry and Natural Resources, University of Georgia, Athens, GA, United States
Recommended Citation:
Bartkowiak S.M.,Samuelson L.J.,McGuire M.A.,et al. Fertilization increases sensitivity of canopy stomatal conductance and transpiration to throughfall reduction in an 8-year-old loblolly pine plantation[J]. Forest Ecology and Management,2015-01-01,354