DOI: 10.1016/j.foreco.2013.02.024
Scopus记录号: 2-s2.0-84875761814
论文题名: Elevated CO2 alters N-growth relationship in spruce and causes unequal increases in N, P and K demands
作者: Li J. ; Dang Q.-L. ; Man R. ; Marfo J.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2013
卷: 298 起始页码: 19
结束页码: 26
语种: 英语
英文关键词: Boreal trees
; Critical deficiency content
; Critical toxicity content
; Growth response to climate change
; Nutrient ratio
; Relative growth rate
Scopus关键词: Boreal trees
; Critical deficiency content
; Critical toxicity content
; Growth response
; Relative growth rate
; Climate change
; Forestry
; Nitrogen
; Nutrients
; Toxicity
; Carbon dioxide
; biomass
; carbon dioxide
; concentration (composition)
; foliage
; forest ecosystem
; growth determination
; growth modeling
; growth rate
; growth response
; height determination
; nitrogen
; nutrient availability
; nutrient dynamics
; nutrient loss
; seedling
; shoot
; toxicity
; Picea
; Picea mariana
英文摘要: CO2 elevation stimulates plant growth, which in turn demands more nutrients to sustain. Since the increase of demand for nitrogen (N), phosphorus (P) and potassium (K) may be in different proportions, the optimal N-P-K ratios at elevated [CO2] are likely different from those at the ambient [CO2]. This study investigated the effects of various N supply levels with constant and variable (constant P and K concentrations) N-P-K ratios under ambient and elevated [CO2] on black spruce (Picea mariana Mill. BSP) seedlings. One-year-old seedlings were exposed to two [CO2] (370 vs. 720μmolmol-1), two nutrient ratio regimes (constant vs. variable N/P/K ratios) and six N concentrations (10, 80, 150, 220, 290 and 360μmolmol-1) in four environmentally controlled greenhouses for 3.5months. Growth response to N varied with [CO2] and N/P/K ratios: under the elevated [CO2], height growth increased with increasing N supply when P and K concentrations were kept constant across different N levels, but it only increased when increasing N from 10 to 150μmolmol-1, and started to decline with further increase in N supply when N/P/K ratios were kept constant at different N levels; at the ambient [CO2], height growth was greatest at 150μmolmol-1 N and was generally greater at 220-360 than at 10 and 80μmolmol-1 N in both nutrient ratio treatments. The foliage to root ratio, shoot mass ratio and total biomass generally increased with increasing N supply but root mass ratio decreased. The smallest specific leaf area occurred at the lowest N supply when N/P/K ratios were kept constant but at 220μmolmol-1 N when P and K concentrations were kept constant across different N supplies. The results of leaf nutrient concentrations suggest that the elevated [CO2] increased demand for N, P and K and the increase for N was greater than P and K, altering the relationship between growth and nitrogen supply. Under the elevated [CO2], high N supplies resulted in growth suppression by critical toxicity content only in the constant N/P/K ratios treatment but low N supplies led to growth suppression by critical deficiency content in both nutrient ratio treatments. At the ambient [CO2], in contrast, N/P/K ratio treatments did not affect growth suppression by critical deficiency or critical toxicity content. Because elevated CO2 causes unequal increases in N, P and K demands, N-P-K ratios should be considered when modeling plant growth responses to elevated CO2. © 2013 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/66623
Appears in Collections: 影响、适应和脆弱性
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作者单位: Faculty of Natural Resources Management, Lakehead University, 955 Oliver Road, Thunder Bay, ON, P7B 5E1, Canada; Ontario Ministry of Natural Resources, Ontario Forest Research Institute, 1235 Queen Street East, Sault Ste. Marie, ON, P6A 2E5, Canada
Recommended Citation:
Li J.,Dang Q.-L.,Man R.,et al. Elevated CO2 alters N-growth relationship in spruce and causes unequal increases in N, P and K demands[J]. Forest Ecology and Management,2013-01-01,298