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University of Twente (2013)

ASSESSMENT OF SOIL ORGANIC CARBON STOCKS IN THE LIMPOPO NATIONAL PARK : FROM LEGACY DATA TO DIGITAL SOIL MAPPING

Cambule Armindo Henrique

Titre : ASSESSMENT OF SOIL ORGANIC CARBON STOCKS IN THE LIMPOPO NATIONAL PARK : FROM LEGACY DATA TO DIGITAL SOIL MAPPING

Auteur : Cambule Armindo Henrique

Université de soutenance : University of Twente

Grade : Doctor 2013

Résumé
The present project is part of the Competing Claims programme (www.competingclaims.nl), an interdisciplinary research programme, jointly implemented by Wageningen University, ITC and Universities/research centers in Mozambique, South Africa and Zimbabwe. The programme’s study area is the GLTFP, a region characterized by heterogeneous but highly dynamic resource use and where competing claims on natural resources are becoming increasingly acute, where the poor become more vulnerable to adverse outcomes of competition. The aim of the competing claims programme is to develop an interdisciplinary and iterative methodological approach for : (1) the understanding competing claims and stakeholder strategies, (2) the identification of alternative resource use options, and (3) scientific support to negotiation processes between stakeholders, with the aim to develop policy interventions that simultaneously improve livelihoods and sustainable use of natural resources. In the present project, the Limpopo National Park will be taken as a pilot study site. The area was declared a National park in 2001 and is located in Mozambique, to the east of Kruger National Park and in between the Limpopo and Elephant Rivers. More than 20.000 people live inside the Park’s boundaries, out of which 6.000 have to be resettled elsewhere outside the park. The research is based on the hypothesis that soil carbon is a good proxy indicator of both environmental goods and services (such as crops, grass for range, but also water storage, soil biology and nutrient cycling) and therefore of the sustainability of land use in southern Africa. Spatial distribution of soil organic carbon and dynamics will be studied. Traditional soil survey and analysis are expensive and time-consuming. The project’s approach aims at covering larger area at low cost and time, though perhaps a little less accurate. The approach will combine the estimation of soil organic carbon from diffuse reflectance spectroscopy and digital soil mapping using secondary information, especially terrain parameters derived from digital elevation data, along with spectral information captured by remote sensors, supported by limited field observations, to map the distribution of soil organic carbon. The mapping exercise will make use of geostatistical techniques developed to study the spatial structure of regionalized variables. Soil carbon dynamics will be studied as related to impacts of past land use management, which will then aid in developing impacts of future land use options

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Page publiée le 29 novembre 2013, mise à jour le 25 janvier 2018