DOI: 10.1016/j.foreco.2014.05.026
Scopus记录号: 2-s2.0-84902115308
论文题名: Light absorption and light-use efficiency in mixtures of Abies alba and Picea abies along a productivity gradient
作者: Forrester D.I. ; Albrecht A.T.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2014
卷: 328 起始页码: 94
结束页码: 102
语种: 英语
英文关键词: Canopy structure
; Competition
; Competitive reduction
; Crown architecture
; Maestra model
; Stress-gradient hypothesis
Scopus关键词: Competition
; Light absorption
; Mixtures
; Plants (botany)
; Canopy structure
; Competitive reduction
; Crown architecture
; Influence relationships
; Photosynthetically active radiation
; Picea Abies (L.) Karst
; Resource availability
; Stress-gradient hypothesis
; Forestry
; absorption
; canopy architecture
; coniferous forest
; forestry modeling
; forestry production
; light use efficiency
; mixed forest
; Competition
; Forest Canopy
; Light Absorption
; Mixtures
; Plants
; Germany
英文摘要: There is great interest in how species interactions change along spatial gradients in resource availability and climatic conditions. Many studies have shown that facilitation or complementary effects increase as growing conditions become harsher, however, several studies in forests have recently shown the opposite trend. Increasing complementary effects with improving growing conditions may result when species interactions influence light absorption or use. This hypothesis was tested in mixed-species forests of Abies alba Mill. and Picea abies (L.) Karst. in south-western Germany where complementary effects on growth increased as climatic conditions improved. The absorption of photosynthetically active radiation (APAR) by individual trees was predicted using a detailed light model. Light-use efficiency (LUE) of individual trees was estimated as basal area growth per unit APAR. APAR and LUE were modelled as functions of crown size, climatic variables and the species composition and density of the neighbourhood of individual trees. For a given tree size, APAR (for both species) and LUE (of A. alba trees) were greater for trees in mixed-species neighbourhoods than monospecific neighbourhoods and this complementary effect increased as climatic conditions improved and on sites with faster growing trees. Increases in APAR for A. alba probably resulted because shading from P. abies trees was less intense than that from other A. alba trees on the more productive site. The species composition of individual tree neighbourhoods did not influence relationships between stem diameter and crown diameter or height to the crown base, for either species. However, the height of each species, for a given stem diameter, increased as the proportion of a given tree's neighbourhood basal area that was composed of the same species increased. This change in crown architecture could also have contributed to the complementarity effects in these stands. Increasing complementary effects with improving growing conditions is consistent with the stress-gradient hypothesis if competition for light is considered to be the stressor. This study shows that such a spatial pattern in species interactions could be associated with increasing differences in APAR or LUE between mixtures and monocultures as climatic conditions become more favourable. © 2014 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/65840
Appears in Collections: 影响、适应和脆弱性
There are no files associated with this item.
作者单位: Faculty of Environment and Natural Resources, Freiburg University, Tennenbacherstr. 4, 79108 Freiburg, Germany; Forest Research Institute of Baden-Wurttemberg, Wonnhaldestr. 4, 79100 Freiburg, Germany
Recommended Citation:
Forrester D.I.,Albrecht A.T.. Light absorption and light-use efficiency in mixtures of Abies alba and Picea abies along a productivity gradient[J]. Forest Ecology and Management,2014-01-01,328