DOI: 10.1016/j.foreco.2017.08.045
Scopus记录号: 2-s2.0-85028712678
论文题名: Nitrogen fertilization improves the growth of lodgepole pine and white spruce seedlings under low salt stress through enhancing photosynthesis and plant nutrition
作者: Duan M. ; Chang S.X.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2017
卷: 404 起始页码: 197
结束页码: 204
语种: 英语
英文关键词: Growth response
; Photosynthetic rate
; Picea glauca
; Pinus contorta
; Salt tolerance
; Seedling nutrient
; Shoot water potential
Scopus关键词: Nitrogen
; Nitrogen fertilizers
; Nutrients
; Nutrition
; Photosynthesis
; Physiological models
; Physiology
; Seed
; Soils
; Growth response
; Photosynthetic rate
; Picea glauca
; Pinus contorta
; Salt tolerance
; Shoot water potential
; Forestry
; Picea
; Picea glauca
; Pinus contorta
英文摘要: The effectiveness of nitrogen (N) fertilization in improving tree growth in saline forest soils is poorly understood. Hence, in this study, the interactive effect of N fertilization and salt stress on seedling physiology and growth was examined to improve our understanding of possible mechanisms for fertilization to mitigate salt stress. We compared physiological characteristics, growth, and foliar and root nutrient concentrations in lodgepole pine (Pinus contorta) and white spruce (Picea glauca) seedlings planted in a peat-mineral soil mix during a three months study with N fertilization (0 and 300 mg N seedling−1) and salinity (0, 50, 100, 150 mmol L−1 NaCl) in a greenhouse experiment. Nitrogen fertilization significantly increased net photosynthetic rates (Pn) and N concentrations in needles and roots, resulting in improved seedling height and root collar diameter growth and total seedling biomass for both species when seedlings were subjected to low salinity (50 mmol L−1 NaCl), while it did not help tree growth under high salinity (150 mmol L−1 NaCl). The physiological responses to combined salt stress and N fertilization did not differ between the two species; however, fertilization improved the growth of pine seedlings more than that of spruce seedlings under different salinity levels. The results suggest that the effectiveness of N fertilization in mitigating the salinity effect on seedling growth was species specific. Our study demonstrates that N fertilization improves tree growth through enhanced photosynthesis and N nutrition under low salinity and provides valuable insights into strategies to manage N nutrition in saline boreal forest soils. © 2017 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/64119
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Renewable Resources, University of Alberta, Edmonton, Canada; College of Chemical & Environment Science, Shaanxi University of Technology, Hanzhong, China
Recommended Citation:
Duan M.,Chang S.X.. Nitrogen fertilization improves the growth of lodgepole pine and white spruce seedlings under low salt stress through enhancing photosynthesis and plant nutrition[J]. Forest Ecology and Management,2017-01-01,404