Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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    Reducing agro-environmental trade-offs through sustainable livestock intensification across smallholder systems in Northern Tanzania
    Paul, Birthe K. ; Groot, Jeroen C.J. ; Birnholz, Celine A. ; Nzogela, Beatus ; Notenbaert, A. ; Woyessa, Kassahun ; Sommer, Rolf ; Nijbroek, Ravic ; Tittonell, Pablo - \ 2020
    International Journal of Agricultural Sustainability 18 (2020)1. - ISSN 1473-5903 - p. 35 - 54.
    bio-economic household modelling - climate-smart agriculture - ex-ante impact assessment - improved livestock feeding - Sub-Sahara Africa

    Livestock productivity in East Africa, and especially in Tanzania, remains persistently low, while greenhouse gas (GHG) emission intensities are among the highest worldwide. This mixed methods study aims to explore sustainable livestock intensification options that reduce agro-environmental trade-offs across different smallholder farming systems in Northern Tanzania. A smallholder livestock systems typology was constructed, and representative farms simulated with a whole farm multi-objective optimization model. Livestock contributed more than 90% of on-farm GHG emissions, and DAIRY had the lowest GHG emission intensity (2.1 kg CO2e kg−1 milk). All livestock systems had alternative options available to reduce agro-environmental trade-offs, including reducing ruminant numbers, replacing local cattle with improved dairy breeds, improving feeding through on-farm forage cultivation, and minimizing crop residue feeding. Three obstacles to adoption of these technologies became apparent: they require a skillful re-organization of the entire production system, result in loss of some multi-functionality of livestock, and incur higher production risks. Sustainable livestock intensification can be a key building block to Tanzania's climate-smart agriculture portfolio, providing synergies between productivity and income increases, and climate change mitigation as co-benefit. A better understanding of the institutional settings, incentives and coordination between stakeholders is needed to sustainably transform the livestock sector.

    Soil organic carbon baselines for land degradation neutrality : Map accuracy and cost tradeoffs with respect to complexity in Otjozondjupa, Namibia
    Nijbroek, Ravic ; Piikki, Kristin ; Söderström, Mats ; Kempen, Bas ; Turner, Katrine G. ; Hengari, Simeon ; Mutua, John - \ 2018
    Sustainability 10 (2018)5. - ISSN 2071-1050
    Land degradation neutrality - Map accuracy - Method complexity - Namibia - Sampling density - Soil organic carbon

    Recent estimates show that one third of the world's land and water resources are highly or moderately degraded. Global economic losses from land degradation (LD) are as high as USD $10.6 trillion annually. These trends catalyzed a call for avoiding future LD, reducing ongoing LD, and reversing past LD, which has culminated in the adoption of Sustainable Development Goal (SDG) Target 15.3 which aims to achieve global land degradation neutrality (LDN) by 2030. The political momentum and increased body of scientific literature have led to calls for a 'new science of LDN' and highlighted the practical challenges of implementing LDN. The aim of the present study was to derive LDN soil organic carbon (SOC) stock baseline maps by comparing different digital soil mapping (DSM) methods and sampling densities in a case study (Otjozondjupa, Namibia) and evaluate each approach with respect to complexity, cost, and map accuracy. The mean absolute error (MAE) leveled offafter 100 samples were included in the DSM models resulting in a cost tradeofffor additional soil sample collection. If capacity is sufficient, the random forest DSM method out-performed other methods, but the improvement from using this more complex method compared to interpolating the soil sample data by ordinary kriging was minimal. The lessons learned while developing the Otjozondjupa LDN SOC baseline provide valuable insights for others who are responsible for developing LDN baselines elsewhere.

    Development of a Soil Organic Carbon Baseline for Otjozondjupa, Namibia
    Nijbroek, R. ; Kempen, B. ; Mutua, J. ; Soderstrom, M. ; Piikki, K. ; Hengari, S. ; Andreas, A. - \ 2017
    In: Proceedings of the Global Symposium on Soil Organic Carbon 2017. - FAO - ISBN 9789251098387 - p. 142 - 150.
    Land Degradation Neutrality (LDN) has been piloted in 14 countries and will be scaled up to over 120 countries. As a LDN pilot country, Namibia developed sub-national LDN baselines in Otjozondjupa Region. In addition to the three LDN indicators (soil organic carbon, land productivity and land cover change), Namibia also regards bush encroachment as an important form of land degradation. We collected 219 soil profiles and used Random Forest modelling to develop the soil organic carbon stock baseline. Values range between 0.53 and 4.27 kg/m2 in the sandy Otjozondjupa soils. LDN baselines were integrated into other national planning processes to add value to LDN products. Analyses of the relationship between soil carbon and land cover change, especially from grassland to bushland, increased the usefulness of soil carbon maps for the Integrated Regional Land Use Planning process. Local ownership of LDN baseline development, from data collection to digital soil mapping, was crucial for local stakeholders.
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