| Based on literature data and field investigation,there were two parts of research work including spatial pattern and growth model of natural broad-leaved forest of Cyclobalanopsisin.Spatial pattern research were in accordance with floristic plant geography,community science,population,Cyclobalanopsis glauca natural broad-leaved forest spatial pattern of,and evaluated forest health.Growth model research included dynamic growth model of the whole forest and single tree,and the specific results were as follows:(1)Cyclobalanopsis myrsinifolia community had 54 families 94 genera and 153 species,Cyclobalanopsis elevaticostata community had 25 families 47 genera and 72 species,Cyclobalanopsis chungii community had 36 families 63 genera and 98 species.The number of Cyclobalanopsis myrsinifolia community species was the largest,followed by Cyclobalanopsis chungii community,the last of the Cyclobalanopsis elevaticostata community.One third of there communities belonged to the distribution of pan tropical and north temperate zone.The distance of Cyclobalanopsis myrsinifolia and Cyclobalanopsis chungii community was the nearest,species similarity of them was also the largest;The distance of Cyclobalanopsis myrsinifolia and Cyclobalanopsis elevaticostata community was the furthest,species similarity of them was also the least.(2)Cyclobalanopsis myrsinifolia community,Cyclobalanopsis elevaticostata community and Cyclobalanopsis chungii community were all relatively climax community.Fagaceae plant and phanerophytes accounted for absolute advantage,leaf properties generally in close agreement in three communities.Cyclobalanopsis myrsinifolia population were growing population,Cyclobalanopsis elevaticostata community and Cyclobalanopsis chungii community were the aging population.The crown length of there communities had stable growth trend with the increase of diameter class.The effect of tree height to crown was much larger than DBH on the crown,the effect of tree height to crown length was much larger than DBH on the crown length in there communities.(3)The distribution of Cyclobalanopsis myrsinifolia community,Cyclobalanopsis elevaticostata community and Cyclobalanopsis chungii community was aggregated,aggregation reason was caused by the interaction of communities and environment.There was only no significant difference between observed value and predictive value of multi degree distribution of tree layer of Cyclobalanopsis elevaticostata community,and the species abundance distribution fit to logarithmic series distribution.Cyclobalanopsis myrsinifolia population and Cyclobalanopsis chungii population were in mature stage of succession,Cyclobalanopsis elevaticostata community was in primary stage of succession.The distribution of Cyclobalanopsis myrsinifolia and Cyclobalanopsis chungii population' individuals was inhomogeneous.The distribution of seedlings and saplings of Cyclobalanopsis myrsinifolia and Cyclobalanopsis chungii population was aggregated,the quantity of which ware large.The update status of Cyclobalanopsis myrsinifolia and Cyclobalanopsis chungii population were good,the pattern strength and pattern Scale of which had a big change,the status of which were dominant in the communities.The distribution of Cyclobalanopsis elevaticostata population' individuals was homogeneous.The distribution of seedlings and saplings of Cyclobalanopsis elevaticostata population was aggregated softly,the quantity of which ware low.The update status of Cyclobalanopsis elevaticostata population were bad,the pattern strength and pattern Scale of which had a little change,the status of which weren't dominant in the communities.(4)Cyclobalanopsis myrsinifolia population,Cyclobalanopsis elevaticostata population,Cyclobalanopsis chungii population and Fagaceae plant in Cyclobalanopsis myrsinifolia community,Cyclobalanopsis elevaticostata community,,Cyclobalanopsis chungii community accounted for absolute advantage.The results of Interspecific association of AC showed that Cyclobalanopsis myrsinifolia,Cyclobalanopsis elevaticostata,Cyclobalanopsis chungii and other species tended to be completely independent.Interspecific association of tree species belonged to a positive association,important value of which occupied the top twenty in Cyclobalanopsis myrsinifolia community.Interspecific association of half tree species belonged to a negative association,important value of which occupied the top twenty in Cyclobalanopsis elevaticostata community and Cyclobalanopsis chungii community.The results of Interspecific association of OI showed that Cyclobalanopsis myrsinifolia population and other species belonged to a significant positive association,Cyclobalanopsis elevaticostata population and most of the other species were not closely related;Cyclobalanopsis chungii population and more than half of the other tree species were not closely related.Interspecific association of tree species belonged to a significant positive association,important value of which occupied the top twenty in Cyclobalanopsis myrsinifolia community.Interspecific association of tree species belonged to no association,important value of which occupied the top twenty in Cyclobalanopsis elevaticostata community and Cyclobalanopsis chungii community.(5)The survival rate and the cumulative mortality of Cyclobalanopsis myrsinifolia population was similar with of Cyclobalanopsis elevaticostata population,When the survival rate decreased,the cumulative mortality increased correspondingly.When the survival rate of Cyclobalanopsis chungii population decreased,cumulative mortality increased correspondingly in the early stage;but later reduced or increased slightly.At the same time,Cyclobalanopsis myrsinifolia population and Cyclobalanopsis chungii population existed the death peak,and Cyclobalanopsis elevaticostata population had remained low mortality and loss degree.The quantity dynamic of Cyclobalanopsis myrsinifolia population,Cyclobalanopsis elevaticostata population and Cyclobalanopsis chungii population changed by the influence of fundamental wave obviously,The control trends of biological characteristics in their life cycle were very obvious.However,three species failed to reflect the inherent cycle of fluctuations,and had not reached the stage of maturity.(6)The niche widthB(sw)i of Cyclobalanopsis myrsinifolia community was smaller than that of Cyclobalanopsis elevaticostata community and Cyclobalanopsis chungii community among the top 20 dominant populations(Cyclobalanopsis myrsinifolia community B(sw)i[0.305,1.774],Cyclobalanopsis elevaticostata and Cyclobalanopsis chungii communityB(sw)i[0.000,1.903]).The niche width B(L)i andB(H)t of Cyclobalanopsis elevaticostata community were similar with of Cyclobalanopsis chungii community among the top 20 dominant popultions(Cyclobalanopsis elevaticostata community B(L)i[0.143,0.992],B(H)i[0.000,0.909];Cyclobalanopsis chungii community B(L)i[0.143,0.992],B(H)i[0.143,0.917]),and the niche widthB(L)i and B(H)i of Cyclobalanopsis myrsinifolia community were the most narrow((B(L)i[0.171,0.761],B(H)i[0.028,0.618]).The similarity ratioCih of Cyclobalanopsis myrsinifolia community were similar with of Cyclobalanopsis chungii community among the top 20 dominant populations(Cyclobalanopsis myrsinifolia communityCin[0.000,0.969];Cyclobalanopsis chungii community Cih[0.000,1.000]),and the similarity ratioCih of Cyclobalanopsis elevaticostata community were the most narrow(Cih[0.000,0.887]).The niche overlapB(L)i andB(H)i of Cyclobalanopsis myrsinifolia community,Cyclobalanopsis elevaticostata community,Cyclobalanopsis chungii community were generally low(Cyclobalanopsis myrsinifolia community B(L)i and B(H)i<0.200,Cyclobalanopsis elevaticostata communityB(L)i and B(H)i<0.230,Cyclobalanopsis chungii community<0.317).(7)The study constructed the dynamic growth model of the whole stand and single tree on the basis of the plastochrone,which included 6 parameters calculated by intelligent algorithm.Compared with the previous growth model,using plastochrone instead of age to construct the growth model of the whole stand and single tree was a characteristics,which enriched the solving method of the model parameters for forest growth and provided a new way to develop the forestry numerical table.The dynamic growth model of the whole stand based on the plastochrone could realize the continuous dynamic update of archives data of forest resources,provide the theoretical basis for the optimization of cutting cycle and selective cutting intensity,and provide technical support for the capital rating of natural broad-leaved forest.(8)The study used pursuit method and ant colony optimization,established health assessment system of Cyclobalanopsis natural broad-leaved forest.The grade of forest health was divided into five levels:Health,sub-health,general health,less health and ill health.Cyclobalanopsis myrsinifolia community belonged to health level.Cyclobalanopsis elevaticostata community and Cyclobalanopsis chungii community belonged to sub health levels,and their health were similar.The main reason for the differences in health status was:Cyclobalanopsis elevaticostata community and Cyclobalanopsis chungii community were influenced by tourism,human disturbance and destruction,Cyclobalanopsis myrsinifolia community was little influenced by tourism,which protection was good. |
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