On The Forest Ecology And The Utilizable Potentiality Of The Plant In The Region Among Source Of Qingjiang River

The forest ecology and utilizable potentiality of plant resources in the regionamong source of Qingjiang River was investigated by the ecological methods andplant resource theory. The results are as follows:1, Types of the region forest vegetation could be divided into10vegetation typesand55formations. The main composition of the region vegetation consisted ofarboreal plants including50%broad-leaved forest and20%coniferous forest. In thebroad-leaved forest, deciduous broad-leaved forest was the main structure, whilebroad-leaved forest and evergreen broad-leaved forest was40%.2, Based on the important value (IV) of each component in the forest community,the main arbor could be divided into38dominant populations, which could be furthergrouped into3types. In the first type, the main structure of the region forestvegetation consisted of the most widely distributed Cunninghamia lanceolata plantsand Pinus massoniana, which decided the vegetation environment and vegetationfeatures. The second type mostly included evergreen or deciduous broad-leavedspecies as Castanea henryi, Cyclobalanopsis glauca, Castanopsis fargesii,Liquidambar formosana, Phoebe zhennan, Fagus longipetiolata and so on. Thesespecies constituted about50%of the broad-leaved forest vegetation. The third type,confined to lower layer of the community space, was sub-communities includingPrunus padus, Eurya japonica, Rhododendron stamineum, Weigela japonica var.sinica, Schefflera delavayi and so on.3, The region forest communities could be divided into23types,82.3%of whichwere polydominant communities and each of them consisted of at least2dominantspecies.4, The region forest vegetation showed high biodiversity indexes. TheShannon-wiener and Simpson indexes were4.2763,0.8938and reached the highest of5.2830and0.9648, respectively. The biodiversity indexes decreased with altitudegoing up, which were very significant within800-1200m, but not for the communitiesover1200m. The main reason might be that there were rare human interference in this range.5, Within the forest communities the interrelation of dominant species showedsignificant negative indexes, which indicated that most of the forest communitieswere still in the developing stage.6, Five stand structures and six criteria for plant function division wereestablished, based on which133species were analyzed by CCA ordination. In thisCCA ordination, the133species were divided into3CCA1-based functional groupsand5CCA2-based functional groups. Base on two results，the species were dividedinto8functional groups. This classification system clearly revealed the importance ofspecies in the stand structure and the succession regulation of the communities.7, Evaluation system consisting of five factors as biotope, regeneration potential,frequency, abundance and availability was established for analysis of the potentialityof comprehensive utilization. Based on this established evaluation method, the324dominant species were analyzed.173species, covering53.4%of the forest plants,showed the comprehensive utilization index of over2.0, which indicated the rich plantresources and great development potentials.