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biomass Prediction Equation for Colophospermum mopane (Mopane) in Botswana

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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