The Ecological Relationship Study Of Plant-Communities On Midland Of Taihang Mountain

Taihang Mountain, standing on the edge of Campagna of North-China, is the headstream of Hai River. Constructing Forest Ecosystem of Taihang Mountain plays an important role in protecting ecology safety and improving manufacturing and life environment of Campagna of North-China and the area of Beijing and Tianjin. Virescence Project of Taihang Mountain is one of main Forestry-Construction Projets in the whole country.The main work in the dissertation is to study the ecological relationship of plant comunities on midland of Taihang Mountain, and to reveal the distributing rule of vegetation and the environmental factors in midland of Taihang Mountain. It is significance not only in theory, but also brings into play important directive function for the Virescence Project of Taihang Mountain and makes it develop effectively. The research work of this dissertation is organized as follows.1.Study on classifying and ordination of plant communities: Acording to the ecological relationship between plant species,plant communities and environment, we study the communities types, structure and distributing pattern of midland of Taihang Mountain by using TWINSPAN, DCA,CCA, DCCA and so on. Using TWINSPAN, we get 10 community types. The result of DCA ordination shows that diffirent plant communities and their distributing area vary with the environmental grads in the ordination graph when the first axis of DCA denotes altitude change and the sencond axis of DCA denotes change of water equivalent in the soil. The ordination graph of preponderant species in the plant communities is very similar with the ordination graph of plant community types. And the distribution of preponderant species in the plant communities determines the distribution pattern of plant communities types to great degree. The DCCA ordination improves relativity between species and environmental factors. So it avails to explain the ecology meanings of ordination axis. But compared with DCA ordination graph, the points distribution of two-dimension graph of DCCA ordination is much thicker and more concentrated, which causes the limit of plant community types much more obscure. So if DCA combines with classified methods, the ordination effect on samples and species is better than that of DCCA and CCA.2.FSO study on plant communities: We applly Fuzzy Set Ordination (FSO) to analyze theenvironmental factors and vegetation data. Compared with DCCA ordination, FSO is better in reflecting the relationship beween plant community and envirmental factors.3. Study on vegetation succession: By using place to make succession, instead of using time, we have a useful try to hope to support helpful use for reference. On the other hand, we reveal actuality and stages of community succession of midland of Taihang Mountain to presume the succession direction in the future.In the dissertation, we study the ecological relationship of plant communities. Based on it, we not only study methodology of analysis of ecological relatioship, but reveal the ecology rules hiding in the disorder and vast and numerous data, which are aquired by a great lot of research...