正相互作用、竞争大小对称性和非生物胁迫对模拟植物种群自疏的影响。
Effects of positive interactions, size symmetry of competition and abiotic stress on self-thinning in simulated plant populations.
机构信息
MOE Key Laboratory of Arid and Grassland Ecology at Lanzhou University, Lanzhou, China.
出版信息
Ann Bot. 2010 Oct;106(4):647-52. doi: 10.1093/aob/mcq145. Epub 2010 Jul 19.
BACKGROUND AND AIMS
Competition drives self-thinning (density-dependent mortality) in crowded plant populations. Facilitative interactions have been shown to affect many processes in plant populations and communities, but their effects on self-thinning trajectories have not been investigated.
METHODS
Using an individual-based 'zone-of-influence' model, we studied the potential effects of the size symmetry of competition, abiotic stress and facilitation on self-thinning trajectories in plant monocultures. In the model, abiotic stress reduced the growth of all individuals and facilitation ameliorated the effects of stress on interacting individuals.
KEY RESULTS
Abiotic stress made the log biomass-log density relationship during self-thinning steeper, but this effect was reduced by positive interactions among individuals. Size-asymmetric competition also influenced the self-thinning slope.
CONCLUSIONS
Although competition drives self-thinning, its course can be affected by abiotic stress, facilitation and competitive symmetry.
背景与目的
竞争导致拥挤植物种群中的自疏（密度依赖死亡率）。已证明促进相互作用会影响植物种群和群落中的许多过程，但它们对自疏轨迹的影响尚未得到研究。
方法
使用基于个体的“影响区域”模型，我们研究了竞争的大小对称性、非生物胁迫和促进作用对植物单种群自疏轨迹的潜在影响。在模型中，非生物胁迫会降低所有个体的生长，而促进作用会减轻胁迫对相互作用个体的影响。
主要结果
非生物胁迫使自疏过程中的对数生物量-对数密度关系更加陡峭，但个体之间的正相互作用会降低这种影响。大小不对称竞争也会影响自疏斜率。
结论
尽管竞争推动了自疏，但它的过程可能会受到非生物胁迫、促进作用和竞争对称性的影响。
Zotero 插件