globalchange  > 影响、适应和脆弱性
DOI: 10.1016/j.foreco.2015.04.009
Scopus记录号: 2-s2.0-84953353456
论文题名:
Fertilization intensifies drought stress: Water use and stomatal conductance of Pinus taeda in a midrotation fertilization and throughfall reduction experiment
作者: Ward E.J.; Domec J.-C.; Laviner M.A.; Fox T.R.; Sun G.; McNulty S.; King J.; Noormets A.
刊名: Forest Ecology and Management
ISSN:  0378-1127
出版年: 2015
卷: 355
起始页码: 72
结束页码: 82
语种: 英语
英文关键词: Drought ; Fertilization ; Gas exchange ; Loblolly pine ; Sap flux ; Transpiration
Scopus关键词: Drought ; Finite difference method ; Forestry ; Nutrients ; Plants (botany) ; Rain ; Soil moisture ; Transpiration ; Different treatments ; Fertilization ; Gas exchange ; Loblolly pine ; Long-term sensitivity ; Sap flux ; Throughfall exclusion ; Water use efficiency ; Physiological models ; Pinus echinata ; Pinus taeda
英文摘要: While mid-rotation fertilization increases productivity in many southern pine forests, it remains unclear what impact such management may have on stand water use. We examined the impact of nutrient and water availability on stem volume, leaf area, transpiration per unit ground area (EC) and canopy conductance per unit leaf area (GS) of a pine plantation during its 8th and 9th growing seasons. Treatments consisted of a factorial combination of throughfall reduction (30% reduction in throughfall versus ambient) and fertilization (a complete suite of essential nutrients) beginning in April 2012. Overall, our results indicate that despite unusually high rainfall in the study period and a lack of leaf area index (LAI) response, both EC and GS decreased in response to fertilization and throughfall reduction. Fertilization increased stem volume increment 21% in 2013. Treatment differences were greatest in the growing season of 2013, when EC was on average 19%, 13% and 29% lower in the throughfall reduction (D), fertilization (F) and combined treatment (FD) than the control (C), respectively. The responses of GS to volumetric soil water content (VWC) indicate that lower EC in F was associated with a decrease relative to C in GS at high VWC. Decreases of GS in D relative to C were associated with lower VWC, but little change in the response of GS to VWC. Decreases observed in FD resulted from a combination of these two factors. The pattern of GS responses in the different treatments suggests that structural or physiological changes underlie this fertilization response, possibly in fine root area or hydraulic conductivity. In the short term, this led to large increases in the water use efficiency of stem production, which could suggest greater resiliency to minor water stress. However, impacts on long-term sensitivity to drought remain a concern, as the EC reduction triggered by the fertilization treatment was of comparable magnitude to the 30% throughfall exclusion treatment and the greatest reductions were found in the combined treatment. © 2015 Elsevier B.V.
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被引频次[WOS]:52   [查看WOS记录]     [查看WOS中相关记录]
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/65653
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作者单位: Department of Forestry and Environmental Resources, North Carolina State University, 920 Main Campus Drive, Suite 300, Raleigh, NC, United States; Bordeaux Sciences-Agro, University of Bordeaux, Gradignan Cedex, France; Department of Forest Resources and Environmental Conservation, Virginia Polytechnic Institute and State University, 310 West Campus Drive, Blacksburg, VA, United States; Eastern Forest Environmental Threat Assessment Center, United States Forest Service, 920 Main Campus Drive, Suite 300, Raleigh, NC, United States; South East Regional Climate Hub, United States Department of Agriculture, 920 Main Campus Drive, Suite 300, Raleigh, NC, United States

Recommended Citation:
Ward E.J.,Domec J.-C.,Laviner M.A.,et al. Fertilization intensifies drought stress: Water use and stomatal conductance of Pinus taeda in a midrotation fertilization and throughfall reduction experiment[J]. Forest Ecology and Management,2015-01-01,355
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