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Water Use and Benefit of Indigenous Trees: Volume 1: Research Report
Expanded Title:The general aim of this project was “To measure and model the water use and growth of indigenous trees in different types of tree systems, and to quantify the economic benefits and costs of the biomass production under a range of bio-climatic conditions in South Africa.” This aim was addressed by initially organising a stakeholder workshop and subsequent short-listing and selection of priority indigenous tree species and forest types for measurement in the project. Detailed measurements were thereafter taken of tree/forest water-use, above-ground stem biomass increments, weather variables, soil water fluctuations and tree / forest attributes. The data facilitated the calculation of water use efficiency (WUE) for the respective indigenous tree species and forest types, as well as an understanding of the driving variables (weather, water availability, tree / forest attributes). Parameterisation and testing of the MAESPA and Penman-Monteith (“Big-Leaf”-type) models at a selection of these sites, investigated their ability to replicate the field observations of tree and forest water-use. Economic and financial assessments were conducted on informal indigenous tree product markets, as well as more formal/recognised indigenous wood markets. Information on potential products, supply and demand processes, trading and values associated with those markets was documented. Consideration was finally given to the necessary data and information required to assess WUE and site-species optimality, taking into account the economic / financial value of preferred indigenous tree species. Based on experience gained from field measurements it took into account practicalities associated with obtaining the requisite data, compared to a modelling approach.
Date Published:01/11/2015
Document Type:Research Report
Document Subjects:Agricultural Water - Agro forestry
Document Keywords:Environment
Document Format:Report
Document File Type:pdf
Research Report Type:Standard
WRC Report No:1876/1/15
ISBN No:978-1-4312-0728-2
Authors:Gush MB; De Lange WJ; Dye PJ; Geldenhuys CJ
Project No:K5/1876
Organizations:CSIR Built Environment; University of the Witwatersrand; Stellenbosch University; Nelson Mandela Metropolitan University
Document Size:6 963 KB
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