The relationship between succession and stability in plant community was discussed based on redundancy theory.We regarded that:① Successions are recombination of components (species,individuals,or patches) on paralle...The relationship between succession and stability in plant community was discussed based on redundancy theory.We regarded that:① Successions are recombination of components (species,individuals,or patches) on paralleled structures.In succession,simple paralleled redundancy structure in early stage changes into multiple one in later stage.② Community stability is redundancy structure stability.Every succession stage is stable,for replacement of species does not mean instability.③Resistance is related with redundancy structure and biological characters or longevity of species.In general,communities with complicated redundancy structure and long life span species are stronger in resistance than communities with simple redundancy structure and short life span species,especially in early stages.④Resilience is actually the rate of redundancy recruitments.Community redundancy structure will not be destroyed even in communities with simple redundancy structure and short life span species,if there are redundancy recruitments.⑤Resistance,resilience,persistence and variability are redundancy phenomenon at levels of individual,species and community.They should not be defined as 4 components of community stabilities.⑥ Succession speed or pattern,dominants,species diversity and so on have no innate relation with community stability.展开更多
Watershed landscape pattern is important of study basin’s development and sustainable utilization of natural resources based on the environment.Lancang Rive Basin in Yunnan province is of many special and important c...Watershed landscape pattern is important of study basin’s development and sustainable utilization of natural resources based on the environment.Lancang Rive Basin in Yunnan province is of many special and important characteristics.By selecting three case study areas in up\|stream,middle\|stream,down\|stream along with river basin,based on the theory of landscape ecology,the comparison and analysis are completed in three different cases in this paper.The results show that,in general,there are difference characteristics of landscape pattern in the different location along the River basin.Relatively,integrated quality of landscape of upstream and down stream is good than middle stream in Lancang River Basin.Especially in down stream area,there is a very good codition on its ecology richness and diversity index.One of the reason resulted out the difference in landscape along the river different location is its special natural condition.Another reasons dependence on condition of the local social,economy development,and the environment pressure of population.展开更多
文摘The relationship between succession and stability in plant community was discussed based on redundancy theory.We regarded that:① Successions are recombination of components (species,individuals,or patches) on paralleled structures.In succession,simple paralleled redundancy structure in early stage changes into multiple one in later stage.② Community stability is redundancy structure stability.Every succession stage is stable,for replacement of species does not mean instability.③Resistance is related with redundancy structure and biological characters or longevity of species.In general,communities with complicated redundancy structure and long life span species are stronger in resistance than communities with simple redundancy structure and short life span species,especially in early stages.④Resilience is actually the rate of redundancy recruitments.Community redundancy structure will not be destroyed even in communities with simple redundancy structure and short life span species,if there are redundancy recruitments.⑤Resistance,resilience,persistence and variability are redundancy phenomenon at levels of individual,species and community.They should not be defined as 4 components of community stabilities.⑥ Succession speed or pattern,dominants,species diversity and so on have no innate relation with community stability.
文摘Watershed landscape pattern is important of study basin’s development and sustainable utilization of natural resources based on the environment.Lancang Rive Basin in Yunnan province is of many special and important characteristics.By selecting three case study areas in up\|stream,middle\|stream,down\|stream along with river basin,based on the theory of landscape ecology,the comparison and analysis are completed in three different cases in this paper.The results show that,in general,there are difference characteristics of landscape pattern in the different location along the River basin.Relatively,integrated quality of landscape of upstream and down stream is good than middle stream in Lancang River Basin.Especially in down stream area,there is a very good codition on its ecology richness and diversity index.One of the reason resulted out the difference in landscape along the river different location is its special natural condition.Another reasons dependence on condition of the local social,economy development,and the environment pressure of population.