Review on Factors Affecting Plant Competition

查看全文 作　　者：Xue [1]Li;Fu [1]Jingdan 机构地区：[1]College of Forestry,South China Agricultural University 出　　处：《Chinese Forestry Science and Technology》索引2012年第11卷第3期,共1页 摘　　要：The competition refers to the interactions of two or more individuals which compete for resources,and is a key process of plant populations and communities.A comprehensive understanding of plant competition is necessary to predict the responses of ecological systems to environmental changes.The inside factors affecting competition include plant density,biological factors and the biomass.The environmental factors related to competition include light,soil moisture,soil nutrient and altitude.High density affects plant competition by controlling plant growth.Allelochemicals produced by plants directly affect their neighbors. Trees and grasses may compete for resources where their root systems overlap.Herbivorous animals chose to eat some plants,resulting in reduction of competition ability of the plants.Plants make morphological shifts and alter the competitive ability between above-ground and below-ground parts in response to the environmental changes.When shade- tolerant species are absent in mixed forest,less shade tolerant species could maintain their dominance for a long period.In contrast,mixed forest with tolerant species would reduce the dominance of less-tolerant species,maintain and probably increase the dominance through the decline of less-tolerant species.Smaller plants should have longer survival time due to their smaller total water requirements when water is scarce,and the longer survival of plants with higher root allocation could be due to a relative reduction in transpiring surface per unit root length.In nutrient-deficient soils,plants are stressed directly by the lack of adequate nutrients and competitive interactions may be controlled by a plant’s ability to efficiently take up available nutrients.In nutrient-sufficient soils,plants with the highest maximum growth rates may well be the superior competitors.Intensity of light competition declines with altitude.The future research about competition will focus on large scale,long term and multi-population research,the multi-disciplinary cooperation,combining competition mechanisms with empirical models,complicated competition model and the root system competition,effects of morphological and physiological plasticity of plants on plant competition. 关 键 词：REVIEW PLANT COMPETITION RESOURCE DENSITY ENVIRONMENT