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Modelling growing space of four valuable broadleaved tree species in southern China

Forestry Studies in China 2013年第3期15卷 167-178页

作者： Johanna SCHULER Josephine CUENI Heinrich SPIECKER Wen-Fu GUO Faculty of Environment and Natural Resources Albert-Ludwigs-Universitt Sci-Tech Division of the Experimental Centre for Tropical Forestry Chinese Academy of Forestry

We present management tools for growing four valuable broadleaved tree species, indigenous to *** southern China. crown diameter （CD） of the species studied can be predicted very well by using a model that is so e y a near funct on of d ameter at breast he ght （DBH）. The add t on of tree age （AGE） and yield class （YC） to this-nodel did not significantly improve its predictive capacity. We used species-specific crown diameter models to calcu- ate the amount of growing space and subsequently stand density that each species needs to achieve desired stem ＂adial growth rates. Furthermore we used this information to calculate a ＂distance factor＂, a rule of thumb that roughly ~stimates the distance between two neighboring trees needed to achieve a desired future target diameter. These tools ＇acilitate the planning of thinning regimes by using crown diameter models combined with annual radial growth rates to ;alculate the number of crop trees per hectare required to reach a desired target stem diameter.

关键词： crown diameter diameter growth growth model valuable timber management tool

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Biomass Prediction Equation for Colophospermum mopane (Mopane) in Botswana

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Journal of Geoscience and Environment Protection 2023年第6期11卷 1-22页

作者： Patrick S. Mutakela Joyce P. Lepetu Gofaone Rammotokara Melusi Rampart Sarah Assem Ibrahim Chobe Land Board Kasane Botswana Department of Range and Forest Resources Botswana University of Agriculture and Natural Resources Gaborone Botswana Department of Biostatistics and Demography Cairo University Cairo Egypt

This study aimed to develop a biomass equation for estimating the total above-ground biomass for Colophospermum mopane (mopane) based on the pooled data from three study sites. The mopane woodlands in Botswana represent 14.6% of Botswana’s total area. The woodlands directly or indirectly support the livelihood of the majority of the rural population by providing wood and non-wood products. However, there is limited information on the pattern, trends and distribution of woody biomass production and their primary, environmental, and climatic determinants in different parts of Botswana. All the data were collected by destructive sampling from three study sites in Botswana. Stratified random sampling was based on the stem diameter at breast height (1.3 m from the ground or diameter at Breast Height (DBH)). A total of 30 sample trees at each study site were measured, felled and weighed. The data from the three sites were pooled together, and the study employed regression analysis to examine the nature of relationships between total above-ground biomass (dependent variable) and five independent variables: 1) total tree height;2) crown diameter;3) stem diameters at 0.15 m;1.3 m (DBH) and 3 m from the ground respectively. There were significant relationships between all the independent variables and the dependent variable. However, DBH emerged as the strongest predictor of total tree above-ground biomass for mopane. The equation lnBiomass=-1.163+2.190lnDBH was adopted for use in the indirect estimation of total tree above-ground biomass for mopane in Botswana.

关键词： Botswana Colophospermum mopane crown diameter Stem diameter Total Above-Ground Biomass

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