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Study On Artificial Community Dynamic Characteristics And Function Of Main Species In Evergreen Broad-leaved Forest In Zhejiang Province

Posted on:2008-05-14Degree:MasterType:Thesis
Country:ChinaCandidate:Z W HuangFull Text:PDF
GTID:2143360218954390Subject:Forest cultivation
Abstract/Summary:PDF Full Text Request
Evergreen broad-leaved forest is a typical zonalvegetation and climax community type in the middle subtropics. Because of the long-term artificial destruction, its area and community function were unceasingly small, diversity loss and environmental degradation have been a serious problem especially when more and more fragmentation and island were presented. In recent years, restoration of evergreen broad-leaved forest work started full swing in Zhejiang Province. Under the current situation, it is of great practical significance to study focusedly on the functions of evergreen broad-leaved species and dynamic characteristics of community during the process of vegetation restoration.Based on the methods of community ecology, photosynthesis measurement and combustion technique of cone calorimeter, photosynthesis, combustibility and other characteristics of the main evergreen broad-leaved species were analysed. In addition, this paper also carried out on species diversity, fire-resistant tree species composition and vegetation functional group composition at different restoration stages. Aiming at the question of the forests cultivation in Zhejiang Province, some suggestions were given. The specific results as follow:The photosynthetic adapt abilities of various tree specie is a key factor for tree's survival and growth at communities. The study shows that: evergreen broad-leaved species during the middle and later period succession have better adaptability under the different light surroundings, such as Elaeocarpus glabripetalus, Ilex integra, Photinia prunifolia, Cinnamommum camphora.And Fluorescent Characteristics also verifies the above result. The experiment results indicate that: PSâ…¡reaction centers of majority tree species are not marked oxidized under the full light surroundings. Photosynthetic electron transport activity can maintain highly, in this way, it is helpful to enhance radiant energy dissipation and thus dissipate excess light energy. That is to say, the increase of non-photochemical quenching coefficient can conduce to protect PSâ…¡, and mitigate the effect of high light on photosynthesis.Multivariate regression analysis on the interrelationship between growth and physiology, plant morphology, environmental characteristic, the results indicate that: high growth is significantly positive correlated with Pn, Pmax, ARY and leaf number. Diameter growth is significantly positive correlated with Pn, leaf number and relative humidity of environment, but environmental temperature and light intensity are negatively correlated with plant growth, it means that in despite of that strong light doesn't inactivate or damage PSâ…¡reaction center, light intensity had little effect on evergreen broadleaved seedlings growth.The fire-resistance properties of main evergreen broad-leaved species in Zhejiang Province are analysed synthetically through the method of principal component analysis (PCA) and detrended correspondence analysis (DCA) in this paper. The results are as follows: Eurya hebeclados, Michelia figo, Distylium racemosum, Elaeocarpaus glabripetalus, Aucuba japonica are in the first grade, their fire-resistance property are the best. And Loropetalum chinense, Viburnum odoratissimum, Michelia chapensis, Manglietia yuyuanensis, Cyclobalanopsis glauca (12species) are the second grade. In a word, most of evergreen broad-leaved species showed better fire-resistance property. Of course, ecosystem adaptability, sprout ability, growth rate, economic value can be also calculated.By using DCA ordination and TWINSPAN classification, a total of 42 plots with artificial community restoration are partitioned into 9 community types. Both the methods of DCA ordination and TWINSPAN classification obtained very consistent results, and decreases the error of experiment for environmental deviations. The study is manifested not only the difference in trees species composition but also the functions of environment factors its incarnate the relationship between plants and environmenty. The method of TWINSPAN quantitative classification is applied to classify artificial community restoration, a succession serial and law of artificial community restoration further analyse the succession series of natural succession and artificial renewal of evergreen broad-leaved forest.The regularity of developments of species diversity of artificial community restoration and community natural succession are similar mainly. On the whole, the species diversity artificial community restoration was lower.It is very important that the correlation of species diversity and the aim of function restoration, the index of evergreen broad-leaved forest diversity of the nine communities was higher, the fire biological forest and landscape ecosystem wood is lower. Forest reduced combustible matter and composed of fast growing species is emphasis on the building of the fire biological forest, the ways may be immediately obvious, but there are many questions. For example, tree species composition is simple, forest structure is unreasonable, function of soil and water conservation is significantly decreased, and so on. In order to resolve the afore-mentioned issues, multiple tree species must be further enhanced and perfected. Simulation of structure features of natural community is the best ways for the accelerating restoration of evergreen broad-leaved forest, the community succession is on the rapid development phase rapidly during the least time. In conclusion, plant functional composition, heterogeneity of community and stability of community are correlated with functional group composition, the study of the issues can provide the theory basis for recovery technique and appraisal on evergreen broad-leaved forest ecological system.
Keywords/Search Tags:Evergreen Broad-leaved Forest, Ecophysiology, Ecological Restoration, Functional Groups
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