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>GIS-assisted Modelling of the Historical Climax Forest in North East Yunnan (China) at the Beginning of the 18th Century
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GIS-assisted Modelling of the Historical Climax Forest in North East Yunnan (China) at the Beginning of the 18th Century
The focus of this study is a model of the spatial extent of an evergreen broad leaved forest (EBLF), indigenous in the NE Yunnan region, before the external impact of man. As a consequence of the growing demand for wood and lumber in the 18th and 19th centuries, there are today only a few historic EBLF's to be found in the study area. Since a representative plot of this historic forest type has been measured in past years by Chinese scientists (TANG et al. 2007), the habitats can be assumed to consist of three dominant tree species: 1. Castanopsis delavayi, 2. Castanopsis orthacantha, and 3. Cyclobalanopsis glaucoides. We have transferred these empirical observations to the study area. Using a GIS-based approach, we calculated the number of trunks in different constellations in the area. It further allows the calculation of the basal area, which is an important measurement unit in forestry and may also be helpful in future estimations of biomass. The basal area (BA) is expressed in m~2/ha and represents the ratio of the trunks' cut surface to the free space in between the trees. It is measured at breast height, making the "DBH" (diameter at breast height) an important parameter. The longer-term goal of this study is to deliver the fundamental parameters to enable determination of the overall biomass of the study area at the beginning of the 18th century. For this reason, allometric methods have also been reviewed with regard to the EBLF of the study area, in order to create a foundation for prospective studies.
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