Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/j.pce.2011.07.079 |
An integrated modelling framework to aid smallholder farming system management in the Olifants River Basin, South Africa | |
Magombeyi, M. S.; Taigbenu, A. E. | |
通讯作者 | Magombeyi, M. S. |
来源期刊 | PHYSICS AND CHEMISTRY OF THE EARTH |
ISSN | 1474-7065 |
出版年 | 2011 |
卷号 | 36期号:14-15页码:1012-1024 |
英文摘要 | Computerised integrated models from science contribute to better informed and holistic assessments of multifaceted policies and technologies than individual models. This view has led to considerable effort being devoted to developing integrated models to support decision-making under integrated water resources management (IWRM). Nevertheless, an appraisal of previous and ongoing efforts to develop such decision support systems shows considerable deficiencies in attempts to address the hydro-socioeconomic effects on livelihoods. To date, no universal standard integration method or framework is in use. For the existing integrated models, their application failures have pointed to the lack of stakeholder participation. In an endeavour to close this gap, development and application of a seasonal time-step integrated model with prediction capability is presented in this paper. This model couples existing hydrology, agronomy and socio-economic models with feedbacks to link livelihoods of resource-constrained smallholder farmers to water resources at catchment level in the semi-arid Olifants subbasin in South Africa. These three models, prior to coupling, were calibrated and validated using observed data and participation of local stakeholders. All the models gave good representation of the study conditions, as indicated by the statistical indicators. The integrated model is of general applicability, hence can be extended to other catchments. The impacts of untied ridges, planting basins and supplemental irrigation were compared to conventional rainfed tillage under maize crop production and for different farm typologies. Over the 20 years of simulation, the predicted benefit of untied ridges and planting basins versus conventional rainfed tillage on surface runoff (Mm(3)/year) reduction was 14.3% and 19.8%, respectively, and about 41-46% sediment yield (t/year) reduction in the catchment. Under supplemental irrigation, maize yield improved by up to 500% from the long-term average yield of 0.5 t/ha. At 90% confidence interval, family savings improved from between US$ 4 and US$ 270 under conventional rainfed to between US$ 233 and US$ 1140 under supplemental irrigation. These results highlight the economic and environmental benefits that could be achieved by adopting these improved crop management practices. However, the application of various crop management practices is site-specific and depends on both physical and socio-economic characteristics of the farmers. (C) 2011 Elsevier Ltd. All rights reserved. |
英文关键词 | Crop management practices Family balance Integrated model Smallholder farmer Socio-economic |
类型 | Article ; Proceedings Paper |
语种 | 英语 |
国家 | South Africa |
收录类别 | SCI-E ; CPCI-S |
WOS记录号 | WOS:000296306100035 |
WOS关键词 | DECISION-SUPPORT ; PRODUCTIVITY ; RUNOFF ; CONSERVATION ; CATCHMENT ; FARMERS ; TILLAGE ; IMPACTS ; REGION ; YIELD |
WOS类目 | Geosciences, Multidisciplinary ; Meteorology & Atmospheric Sciences ; Water Resources |
WOS研究方向 | Geology ; Meteorology & Atmospheric Sciences ; Water Resources |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/169954 |
作者单位 | Univ Witwatersrand, Sch Civil & Environm Engn, ZA-2050 Johannesburg, South Africa |
推荐引用方式 GB/T 7714 | Magombeyi, M. S.,Taigbenu, A. E.. An integrated modelling framework to aid smallholder farming system management in the Olifants River Basin, South Africa[J],2011,36(14-15):1012-1024. |
APA | Magombeyi, M. S.,&Taigbenu, A. E..(2011).An integrated modelling framework to aid smallholder farming system management in the Olifants River Basin, South Africa.PHYSICS AND CHEMISTRY OF THE EARTH,36(14-15),1012-1024. |
MLA | Magombeyi, M. S.,et al."An integrated modelling framework to aid smallholder farming system management in the Olifants River Basin, South Africa".PHYSICS AND CHEMISTRY OF THE EARTH 36.14-15(2011):1012-1024. |
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