Effects of positive interactions, size symmetry of competition and abiotic stress on self-thinning in simulated plant populations
Effects of positive interactions, size symmetry of competition and abiotic stress on self-thinning in simulated plant populations
复制标题
正向相互作用、竞争的大小对称性和非生物胁迫对模拟植物种群自我稀疏的影响
DOI：
10.1093/aob/mcq145
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发表时间：
2010-10-01
期刊：
影响因子：
4.2
通讯作者：
Wang, Gang
中科院分区：
文献类型：
--
作者：
Chu, Cheng-Jin;Weiner, Jacob;Wang, Gang
在拥挤的植物种群中，竞争导致了自疏(密度相关死亡)。易化互作已被证明影响植物种群和群落中的许多过程，但其对自疏轨迹的影响尚未被研究.利用基于个体的“影响区”模型，我们研究了竞争、非生物胁迫和易化对植物单培养自疏轨迹的潜在影响.在该模型中，非生物胁迫降低了所有个体的生长，易化作用改善了胁迫对相互作用个体的影响，非生物胁迫使自疏过程中的对数生物量-对数密度关系变得更加陡峭，但这种影响被个体之间的正向交互作用所减弱。大小不对称竞争也影响着自疏坡度，虽然竞争驱动着自疏，但其过程会受到非生物胁迫、促进作用和竞争对称性的影响。
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.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.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.Although competition drives self-thinning, its course can be affected by abiotic stress, facilitation and competitive symmetry.