DOI: 10.1016/j.foreco.2014.05.013
Scopus记录号: 2-s2.0-84901481971
论文题名: Effects of mixing clones on hybrid poplar productivity, photosynthesis and root development in northeastern Canadian plantations
作者: Elferjani R. ; DesRochers A. ; Tremblay F.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2014
卷: 327 起始页码: 157
结束页码: 166
语种: 英语
英文关键词: Clones mixture
; Growth
; Hybrid poplar
; Photosynthesis
; Root distribution
Scopus关键词: Biomass
; Cloning
; Cultivation
; Ecology
; Growth (materials)
; Mixing
; Nutrients
; Photosynthesis
; Productivity
; Photosynthesis
; Above ground biomass
; Belowground competition
; Hybrid poplar
; Hybrid poplar clones
; Net assimilation rates
; Non-structural carbohydrates
; Plantation establishment
; Root distribution
; Root development
; Forestry
; Growth (materials)
; aboveground biomass
; biomass allocation
; carbohydrate
; clone
; deciduous forest
; growing season
; growth rate
; hybrid
; monoculture
; nutritional status
; photosynthesis
; plantation forestry
; productivity
; root system
; assimilation efficiency
; cultivar
; deciduous tree
; nutrient dynamics
; pest damage
; yield response
; Canada
; Quebec [Canada]
英文摘要: Mixing tree cultivars or species in forest plantations can be efficient to reduce the risk of pest damages and could have a positive effect on yields if complementarity or facilitation between trees occurs. Four hybrid poplar clones (747215, Populus trichocarpa Torrey & A.Gray×P. balsamifera L.; 915004 and 915005, P. balsamifera×P. maximowiczii Henry; and 915319 P. maximowiczii×P. balsamifera) were planted in monoclonal and polyclonal plantations in three sites located in Quebec, Canada, to assess effects of clonal diversity on (i) aboveground biomass productivity, (ii) net photosynthesis and nutrient status of trees, and (iii) root spatial distribution. Stem growth was measured over five growing seasons, while root development, foliar nutrient concentrations and photosynthesis were measured during the fifth growing season. Results showed frequent but not general overyielding of trees in the polyclonal plots compared to monoclonal plots, five years after plantation establishment. Overall, stem volumes were 21% higher in the polyclonal (7.4m3ha-1) vs. monoclonal (6.1m3ha-1) plots. Effects of clone mixing on growth were greater in sites where soil nutrients were more limiting. However, foliar macronutrient concentrations (N, P, K, Ca and Mg) in trees growing in polyclonal plots were similar to those in monoclonal plots. Root development differed between the two plot layouts, with mean root:shoot ratio being greater in monoclonal (0.41:1) vs. the polyclonal (0.35:1) plots. Mixing clones increased biomass allocation aboveground, which we attributed to reduced competition between individuals of different clones and could explain overyielding in the polyclonal plots. The root fraction most distant from the stem (≥60cm) was greater in monoclonal (67% of total root biomass) compared to polyclonal (47% of total root biomass) plots, suggesting greater belowground competition in the former, which forced roots to extend further from the stems. Effects of plot layout on net assimilation rate (Pn) depended on site, with trees in polyclonal plots having greater Pn in two of the three sites. Root total non-structural carbohydrates were greater in the polyclonal (216mgg-1) compared to the monoclonal (159mgg-1) plots. Mixing hybrid poplar clones often resulted in greater aboveground growth, lower root:shoot ratios, and different spatial root distributions, when compared to clones planted in monocultures. © 2014 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/65897
Appears in Collections: 影响、适应和脆弱性
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作者单位: Chaire industrielle CRSNG-UQAT-UQAM en aménagement forestier durable, Université du Québec en Abitibi-Témiscamingue, 341 rue Principale Nord, Amos QC J9T 2L8, Canada
Recommended Citation:
Elferjani R.,DesRochers A.,Tremblay F.. Effects of mixing clones on hybrid poplar productivity, photosynthesis and root development in northeastern Canadian plantations[J]. Forest Ecology and Management,2014-01-01,327