The Effects of Tree Size, Stand Density, and Tree-Species Mixing on Stand Level and Tree Level Light Absorption and Light-Use Efficiency: A Review

IF 9 1区 农林科学 Q1 FORESTRY
David I. Forrester, Benjamin N. E. Plaga, Jürgen Bauhus
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Abstract

Purpose of Review

Tree species mixtures are often more productive than monocultures. One possible reason for this is higher absorption of photosynthetically active radiation (APAR) and improved light use efficiency (LUE) in mixtures. Here, we identified the processes influencing APAR and LUE in forests, examined how APAR and LUE are influenced by mixing species or reducing stand density, how these effects vary along site gradients, and implications for modelling of forest growth.

Recent Findings

Eight of 18 cases had 4 to 86% (mean 27%) higher stand APAR in mixtures than the most productive monoculture, four found 13 to 49% (mean 25%) higher APAR compared to the average of the monocultures, and three found lower APAR in mixtures than in the monoculture with lowest-APAR. Following the same sequence of comparisons for LUE in mixtures vs. monocultures, the counts were ten, one and four cases, respectively. Reductions in stand density reduced stand APAR, and either increased or did not influence LUE. While a common set of interactions and structural characteristics influenced APAR and LUE, their importance varied among forest types, sites, and ages, pointing to the value of using models to understand these processes. At nutrient and water rich sites, where leaf areas and competition for light are high, increased APAR in mixtures typically leads to increased productivity.

Summary

In mixtures, stand-level APAR and LUE can be greater than in monocultures, but this is not always the case, and the causes vary between forest types and sites. Increases in APAR or LUE do not necessarily increase growth, which is more likely on sites with higher soil resources and favourable climatic conditions. Forest growth models are available that summarise this information in a form that can be used by forest practitioners.

林分大小、林分密度和树种混合对林分水平和光利用效率的影响
树种混合通常比单一栽培更高产。其中一个可能的原因是混合物中光合有效辐射(APAR)的吸收增加和光利用效率(LUE)的提高。在这里,我们确定了影响森林中APAR和LUE的过程,研究了混合物种或减少林分密度对APAR和LUE的影响,这些影响如何沿着立地梯度变化,以及对森林生长建模的影响。最近的发现:18个案例中,有8个案例的混合林分APAR比最高产的单一栽培高出4%至86%(平均27%),4个案例的混合林分APAR比单一栽培的平均APAR高出13%至49%(平均25%),3个案例的混合林分APAR比APAR最低的单一栽培低。按照相同的序列对混合与单一培养的LUE进行比较,计数分别为10例、1例和4例。林分密度的降低降低了林分APAR,增加或不影响LUE。虽然一组共同的相互作用和结构特征影响着APAR和LUE,但它们的重要性因森林类型、地点和年龄而异,这表明使用模型来理解这些过程的价值。在养分和水分丰富的地方,叶面积和对光的竞争高,混合物中APAR的增加通常会导致生产力的提高。在混交林中,林分水平的APAR和LUE可能大于单一栽培,但情况并非总是如此,原因因森林类型和立地而异。APAR或LUE的增加并不一定会促进生长,这更可能发生在土壤资源丰富和气候条件有利的地点。现有的森林生长模型以森林从业人员可以使用的形式总结了这些信息。
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来源期刊
Current Forestry Reports
Current Forestry Reports Agricultural and Biological Sciences-Ecology, Evolution, Behavior and Systematics
CiteScore
15.90
自引率
2.10%
发文量
22
期刊介绍: Current Forestry Reports features in-depth review articles written by global experts on significant advancements in forestry. Its goal is to provide clear, insightful, and balanced contributions that highlight and summarize important topics for forestry researchers and managers. To achieve this, the journal appoints international authorities as Section Editors in various key subject areas like physiological processes, tree genetics, forest management, remote sensing, and wood structure and function. These Section Editors select topics for which leading experts contribute comprehensive review articles that focus on new developments and recently published papers of great importance. Moreover, an international Editorial Board evaluates the yearly table of contents, suggests articles of special interest to their specific country or region, and ensures that the topics are up-to-date and include emerging research.
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