DOI: 10.1016/j.foreco.2017.04.038
Scopus记录号: 2-s2.0-85018772782
论文题名: Comparative water use in short-rotation Eucalyptus benthamii and Pinus taeda trees in the Southern United States
作者: Maier C.A. ; Albaugh T.J. ; Cook R.I. ; Hall K. ; McInnis D. ; Johnsen K.H. ; Johnson J. ; Rubilar R.A. ; Vose J.M.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2017
卷: 397 起始页码: 126
结束页码: 138
语种: 英语
英文关键词: Canopy conductance
; Loblolly pine
; Sap flow
; Thermal dissipation probes
; Transpiration
; Water use efficiency
Scopus关键词: Biomass
; Forestry
; Plants (botany)
; Probes
; Thermoanalysis
; Transpiration
; Water resources
; Wood
; Canopy conductance
; Loblolly pine
; Sap flow
; Thermal dissipation
; Water use efficiency
; Ecology
; Eucalyptus
; Pinus taeda
英文摘要: Short rotation Eucalyptus plantations offer great potential for increasing wood-fiber production in the southern United States. Eucalyptus plantations can be highly productive (>35 m3 ha−1 year−1), but they may use more water than intensively managed pine (primarily Pinus taeda L.) plantations. This has raised concern about how expansion of Eucalyptus plantations will affect water resources. We compared tree water use, stem growth, and WUE (kg wood per m3 water transpired) in adjacent nine-year-old Eucalyptus benthamii and P. taeda plantations with similar stand density and leaf area. Sap flux (Fd, g cm−2 s−1) was measured continuously over one year using thermal dissipation probes. Stem biomass, stem growth, tree water use (Et, L day−1), canopy transpiration per unit leaf area (El, mmol m−2 s−1), and canopy stomatal conductance (Gs, mmol m−2 s−1) were quantified. Eucalyptus had higher daily Fd (196.6 g cm−2 day−1) and mean daily Et (24.6 L day−1) than pine (105.8 g cm−2 day−1, 15.2 L day−1). Eucalyptus exhibited a seasonally bimodal pattern in daily Et that did not occur in pine. Monthly Et was 23–51% higher in Eucalyptus and differences between species were greatest in the spring and fall. Annual Et was 32% higher in Eucalyptus (9.13 m3 H2O year−1) than pine (5.79 m3 H2O year−1). Annual stem biomass increment was greater in Eucalyptus (Eucalyptus: 22.9; pine: 11.8 kg tree−1 year−1), and Eucalyptus had greater WUE (Eucalyptus: 2.86; pine 1.72 kg biomass m−3 H2O year−1). Pine exhibited a lower seasonal minimum and higher seasonal maximum leaf area index (LAI). At low LAI, there was no significant difference between species in El or Gs; however, at maximum LAI, pine El and Gs were 46 and 43%, respectively of rates observed in Eucalyptus. The species differed in Gs response to vapor pressure deficit (D). At a similar reference Gs (Gs,ref at D = 1 kPa), pine exhibited greater stomatal sensitivity to D. These results suggest that (1) Eucalyptus trees had higher sap flux and total water use than pine, (2) Eucalyptus had greater stem growth and WUE, and (3) species differences in water use were driven primarily by differences in El and Gs. © 2017 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/64321
Appears in Collections: 影响、适应和脆弱性
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作者单位: US Forest Service, Southern Research Station, 3041 Cornwallis Road, Research Triangle ParkNC, United States; Virginia Tech Department of Forest Resources and Environmental Conservation, 228 Cheatham Hall, Blacksburg, VA, United States; Department of Forestry and Environmental Resources, Box 8008, North Carolina State University, Raleigh, NC, United States; US Forest Service, Southern Region, 1720 Peachtree Road, NW, Atlanta, GA, United States; US Forest Service, Southern Research Station, 1577 Brevard Road, Asheville, NC, United States; 1004 Crooked Oak Rd, Summerville, SC, United States; Departamento de Silvicultura, Facultad de Ciencias Forestales, Universidad de Concepción, Concepción, Chile; US Forest Service, Southern Research Station, Raleigh, NC, United States
Recommended Citation:
Maier C.A.,Albaugh T.J.,Cook R.I.,et al. Comparative water use in short-rotation Eucalyptus benthamii and Pinus taeda trees in the Southern United States[J]. Forest Ecology and Management,2017-01-01,397