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Browsing by Author Liu, J.

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  • Feasibility assessment of renewable energies for cassava irrigation in China

    • Authors: Liu, J.; Xiang, C.;  Advisor: -;  Participants: - (2017)

  • Based on the irrigational water demand of cassava in an area in Guangxi Province, China, this study compared the supply capacity of hybrid wind/solar power water pumping and that of photovoltaic (PV) water pumping through experiments and calculation. Results show that, the hybrid pumping system supported by a 22kW solar panel and wind turbines of 44kW can fully satisfy cassava’s water demand for irrigation in a 26.66 ha field with surplus energy, so shutdown of wind turbines in the initial stages of cassava growth is suggested. The 22kW photovoltaic water pump alone is not sufficient for a 26.66 ha field, but a 1.5-time larger solar panel (33kW) with an enhanced pump should be able to...
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  • The feasibility of solar water pumping system for Cassava irrigation in Guangxi Autonomous Region, China

    • Authors: Liu, J.; Yu, Y.;  Advisor: -;  Participants: - (2017)

  • Cassava is one of the most important cash crop in Guangxi Autonomous Region. The water demanded regulation of cassava is not coincident with the temporal and spatial distribution of precipitation. Irrigation is quite necessary for the growth of Cassava. Solar water pumping system is an effective way for Cassava irrigation. In this paper, the temporal and spatial distribution of Cassava is analyzed first. The potential and distribution of solar energy is also discussed. Considering the main factors including precipitation and slope to analyze the feasibility of solar water pumping system for Cassava irrigation. The results indicate that the Cassava appropriated for solar water pumping ...
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  • Using spatially explicit data to improve our understanding of land supply responses: An application to the cropland effects of global sustainable irrigation in the Americas

    • Authors: Liu, J.; Villoria, N.B.;  Advisor: -;  Participants: - (2018)

  • Land supply elasticities determine the rates of land conversion in global policy models. However, they are only available for few countries in the world. Therefore, analysts seeking to improve the spatial resolution of their models are forced to impose regionally homogeneous parameters over highly heterogeneous regions. This article estimates spatially explicit land supply elasticities using gridded data for the American continent. These estimates reasonably reproduce changes in land use observed at different levels of geographical aggregation across the continent. Plugging our estimates in a previous analysis of the land-use effects of eliminating global unsustainable irrigation, rev...
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  • Water resources conservation and nitrogen pollution reduction under global food trade and agricultural intensification

    • Authors: Liu, J.; Liu, W.;  Advisor: -;  Participants: - (2018)

  • Here we performed a global-scale assessment of impacts of international food trade on blue water use, total water use, and nitrogen (N) inputs and on N losses in maize, rice, and wheat production. Results show that food exports generally occurred from regions with lower water and N use intensities, defined here as water and N uses in relation to crop yields, to regions with higher resources use intensities. The study provides useful information to understand the implications of agricultural intensification for international crop trade, crop water use and N pollution patterns in the world.