Abstract
"(1)、The structure and management of uneven-aged and mixed plantation stands
This study plans to investigate formerly established multiple-layered plantation sites. Through investigations on growth, mortality, and succession of upper- and lower-storeyed trees and analyzing structural indices, dynamics information of intra- and inter-specific tree competition and species succession in different time series can be established, which can be applied to the decisions of adequate species mixture in mixed stands, alternations in spatial and temporal allocation, and management benefits. We will also analyze the quantitative indices of horizontal and vertical structures in artificial mixed plantation stands at different management phases, which can serve as reference data for mixed stand management or transformations of pure stands into mixed or multiple-layered ones. The results can also be applied to enhance carbon sequestration, productivity, and biodiversity of artificial mixed plantation stands.
(2)、Early growth on mixed plantation of Michelia compressa and Calocedrus formosana
The purpose of this project is to investigate the effect of planting density, given the constant mixed ratio of two species, on the early growth of timber growth on mixed plantation of Michelia compressa and Calocedrus formosana inLienhweichih Experiement Forest. Based on the yearly work in plot survey, the condtruation of microsite terrain model on plot area, crown closeure analysis, microenviroment monitoring, spatial stand structure comparison and data analysis, the results of this study can be served as the base for mixed stand management reference.
(3)、Management and effectiveness evaluation on broad-leaved trees mixed stand
According to the abundance of native broad-leaved trees species resources in Taimalii research centre TFRI, the study focus the interests on the biology, ecology and growth characteristics of the mixed stands and plantations in this area, planning workshop including the investigation of growth status, and the monitoring on the affections of different mixed planting models to micro condition of the site and soil/water conservation. The results will be utilized to design the strategies of establishment and and accessing management of the mixed stands. On the other side, to evaluate the benefit, economics and risk of them will be analyzed simultaneously, by the way, regulation procedures will be used to analyze the effectiveness of the carbon sink of different management model of mixed stands."