BIOMASS PRODUCTION, STRUCTURAL DEFORMATION, SELF-THINNING AND THINNING MECHANISMS IN MONOCULTURES
BIOMASS PRODUCTION, STRUCTURAL DEFORMATION, SELF-THINNING AND THINNING MECHANISMS IN MONOCULTURES
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DOI：
10.1098/rstb.1991.0064
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发表时间：
1991-07-29
期刊：
影响因子：
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通讯作者：
BURROWS, FM
中科院分区：
文献类型：
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作者：
BURROWS, FM
考虑到在林分单一栽培中不同间距的植物可能经历的三个可能的生长阶段的生物量生产。可用于此的辐射能的数量与冠层表面积、体积和细度以及执行操作的效率有关。所建立的统一的无量纲公式描述了正常的自然生长、塑性变形生长和受自薄过程影响的生长，这种生长发生在个体过于紧密地挤在一起时。由于在时空中指定植物尺寸和数量的统计不确定性，这些公式定义了单株植物之后的生命线的生长表面，以及这些线的舍入和平滑，这些线发生在严格定义的生长阶段边界上。结果解释了自薄过程的特征，以及与自薄过程发生的相边界的近似幂律描述有关的常数和参数的值。准静态生长和稀疏机制分析表明，在生物量均匀增加和减少的分布中，植物的单侧竞争共存条件，以及区分生物量减少状态的边界，从这些状态中恢复到进一步生长是可能的，还是不可能的。由于生长过程中的事件依赖于冠层形状和体积，本文给出了适当几何形式的初步分类，以及对几种感兴趣的情况的所需数量的评估公式。
Consideration is given to the production of biomass in three of the possible growth phases that may be experienced by plants at various spacings in stand monocultures. The amount of radiant energy available for this is related to canopy surface area, volume, and slenderness, and the efficiency with which the operation is performed. The unified non-dimensional formulae established describe normal natural growth, growth with plastic deformation, and growth subject to the self-thinning process, which occurs when individuals are packed too closely together. The formulae define growth surfaces for the life-lines followed by individual plants, and for the rounding and smoothing of these lines that occurs, at the otherwise sharply defined growth phase boundaries, as a result of the statistical uncertainties in specifying plant dimensions and numbers in spacetime. The results provide an explanation of features of the self-thinning process and the values of the constants and parameters associated with approximate power law descriptions of the phase boundary on which it takes place. A quasi-static analysis of growth and thinning mechanisms indicates one-sided competition coexistence conditions for plants in distributions with uniformly augmented and diminished biomass, and the boundaries separating and distinguishing diminished biomass states from which recovery to further growth is, or is not, possible. Because of the dependence of events in the growth process on canopy shape and volume a preliminary classification of suitable geometric forms is given, together with formulae for evaluating the required quantities, for several cases of interest.