Your search found 6 records
1 Cao, X.; Cui, S.; Shu, R.; Wu, M. 2020. Misestimation of water saving in agricultural virtual water trade by not considering the role of irrigation. Agricultural Water Management, 241:106355. (Online first) [doi: https://doi.org/10.1016/j.agwat.2020.106355]
Virtual water ; Trade ; Exports ; Water conservation ; Agricultural water use ; Estimation ; Agricultural products ; Water use efficiency ; Irrigation water / China / Heilongjiang / Guangdong
(Location: IWMI HQ Call no: e-copy only Record No: H049816)
(0.66 MB)
Water saving by agricultural virtual water trade (VWT) is regarded as a new way to address water shortage, and many studies have considered it at local and global scales. However, the existing calculation methods do not consider how agricultural products should be produced in export and import areas without crop trade. We believe that three facts related to irrigation should be considered in water saving in agricultural VWT evaluation: 1) arable land is highly restricted, 2) irrigation increases crop yield significantly, and 3) green water does not require cost. The role of irrigation, which is important for both the export and import region, is very important for determining how to cultivate crops without virtual water trade. In the case of grain VWT between Heilongjiang and Guangdong, China, the national blue water saving in 2010 with this consideration was -2562.1 Mm³ (water loss), whereas the figure was 975 Mm³ under the existing calculation framework. Therefore, there is a possibility that VWT can be used in agricultural development and water management decision-making while considering the role of irrigation.
2 Li, M.; Cao, X.; Liu, D.; Fu, Q.; Li, T.; Shang, R. 2021. Sustainable management of agricultural water and land resources under changing climate and socio-economic conditions: a multi-dimensional optimization approach. Agricultural Water Management, 259:107235. (Online first) [doi: https://doi.org/10.1016/j.agwat.2021.107235]
Agricultural water use ; Water management ; Land resources ; Climate change ; Socioeconomic aspects ; Sustainable development ; Water security ; Water supply ; Water demand ; Water allocation ; Surface water ; Irrigation water ; Water footprint ; Decision making ; Economic development ; Models / China / Songhua River Basin / Heilongjiang / Harbin / Hegang / Shuangyashan / Yichun / Jiamusi / Qitaihe / Mudanjiang / Suihua
(Location: IWMI HQ Call no: e-copy only Record No: H050756)
(5.27 MB)
Conflict between limited water supply and the ever-increasing water demand poses the challenge of synergetic management of agricultural water and land resources (AWLR). Sustainable development strategy and changing environment increase the multi-dimensional characteristic and complexity of the management of AWLR. This paper establishes a model framework for the multi-dimensional optimization of AWLR in a changing environment. The model framework is advantageous of: (1) Comprehensively allocating water and land resources on the basis of clarifying their interactions; (2) Balancing incompatible goals from multiple dimensions including resources, society, economy, ecology, and environment; (3) proposing alternative allocation schemes of AWLR that can response to the changing environment of both natural and socio-economic changes. Allocation schemes of AWLR based on the model framework are generated, analyzed and evaluated. The comprehensiveness, equilibrium, and security of multi-dimensional targets help obtain the optimum adaptation allocation plans of AWLR to cope with changing environment. The real-world case study in Songhua River Basin in Northeast China verifies the feasibility and practicality of the model framework. The study found that the model framework can manage AWLR in a sustainable way and meanwhile provide decision makers alternatives plans of AWLR for different natural and social changing environments, which will further contribute to the alleviation of agricultural water scarcity and the promotion of agricultural sustainable development.
3 Cao, X.; Li, Y.; Wu, M. 2022. Irrigation water use and efficiency assessment coupling crop cultivation, commutation and consumption processes. Agricultural Water Management, 261:107370. (Online first) [doi: https://doi.org/10.1016/j.agwat.2021.107370]
Irrigation water ; Water use efficiency ; Crop production ; Water management ; Irrigation efficiency ; Water productivity ; Water resources ; Virtual water ; Evapotranspiration ; Wheat ; Maize ; Rice ; Cereals ; Food security / China
(Location: IWMI HQ Call no: e-copy only Record No: H050780)
(6.10 MB)
Water use and efficiency assessment from crop production-consumption process provided a new perspective for regional agricultural water management. An evaluation framework of water use efficiency (WUE) coupling crop cultivation, commutation and consumption processes was established in this paper. The impact of virtual water flow on provincial irrigation water use efficiency, and its implications for irrigation management were assessed based on the inter-provincial virtual irrigation water flow (VIWF) estimation for cereals of China The results showed that national IWU, IWP and IE for cereal production in 2018 were 268.89 Gm³ , 1.815 m³ /kg and 0.494 respectively. Total VIWF among 31 provinces was calculated to be 85.25 Gm³ , with the contributions of 43.8% rice, 40.0% wheat, and 16.2% maize. IWP and IE from the crop consumption perspective in all provinces were different from that observed from production perspective, and the effect of crop supply-demand mismatch on irrigation WUE was comprehensive. Virtual water flow was conducive to water resource conservation and irrigation WUE improvement when judged by IWP. However, the result was just the opposite when IE was used as the evaluation. Improving IWP in the North China Plain and Southeast and optimizing trade structure in Northeast and Southwest contribute to national irrigation water conservation from both of the production and consumption perspectives. The evaluation framework proposed in current paper can inspire the research on agricultural water assessment, management and regulation combining the physical and virtual water.
4 Cui, S.; Wu, M.; Huang, X.; Wang, X.; Cao, X.. 2022. Sustainability and assessment of factors driving the water-energy-food nexus in pumped irrigation systems. Agricultural Water Management, 272:107846. [doi: https://doi.org/10.1016/j.agwat.2022.107846]
Water use ; Energy resources ; Food production ; Nexus approaches ; Irrigation systems ; Sustainability ; Assessment ; Water footprint ; Pumping ; Agricultural production ; Irrigation water ; Water extraction ; Urbanization / China / Lianshui Irrigation District
(Location: IWMI HQ Call no: e-copy only Record No: H051338)
(4.49 MB)
Understanding the status of water-energy-food (WEF) Nexus, oriented to the whole process of water extraction and deployment, water consumption for crop growth, and food production output, in irrigation systems is essential for food security and resources sustainability. Based on WEF Nexus quantification, combining traditional agricultural water-saving and water footprint theory, the sustainable development level (SDL) of water acquisition-transfer-consumption process for pumped irrigation systems was analyzed, using the principal component analysis (PCA) and taking the Lianshui Irrigation District (LID) in eastern China as a case study, in this paper. The driving mechanism of SDL for WEF Nexus was revealed by virtue of the partial least-squares regression (PLSR). Results showed that, annual SDL of the WEF Nexus in the pumped irrigation systems was 0.3 during the study period 2005–2019, mainly due to the low SDLe and SDLf, indicating that sustainability had been concerned. PRE and RRI were significant-positive factors, while CDI functioned as significant-negative driving factors on SDL of WEF Nexus. The measures adjusting crop planting structure, transforming irrigation and drainage mode, updating water pump equipment, and increasing agricultural investment contribute to the sustainability of WEF Nexus in the observed irrigation systems. Therefore, the sustainable management can be implemented according to the unique driving factors identification of WEF Nexus in pumped irrigation systems. The research is conducive to the management and program for irrigated agricultural systems under the changing circumstances.
5 Cui, S.; Zhang, J.; Wang, X.; Wu, M.; Cao, X.. 2023. Fuzzy composite risk assessment of water-energy-food-carbon nexus in the dispark pumped irrigation system. Journal of Hydrology, 624:129879. [doi: https://doi.org/10.1016/j.jhydrol.2023.129879]
Risk assessment ; Water resources ; Energy consumption ; Food production ; Food security ; Carbon ; Nexus approaches ; Pumping ; Irrigation systems ; Drainage systems ; Virtual water ; Water flow ; Water footprint ; Carbon footprint ; Agricultural production ; Precipitation ; Models ; Economic development ; Farming systems ; Uncertainty ; Irrigated farming / China
(Location: IWMI HQ Call no: e-copy only Record No: H052137)
(9.89 MB)
Water, energy, food, and carbon are the most fundamental elements of agricultural development, and the essential needs that human beings and society depend on for survival. Systematic and quantitative analysis of the risks of the water-energy-food-carbon (WEFC) nexus is significant for resource management, especially in irrigated agriculture. Here, the water-energy-food-carbon nexus composite risk index (CRI) was calculated through a fuzzy composite risk assessment model (FCRAM) combined with food trade and virtual water flow, and the multi-dimensional influence mechanism was excavated via partial least squares structural equation modelling (PLS-SEM) in Lianshui irrigation district (LID), a pumped irrigation system in east China. Results indicated that the amount of food trade, virtual water flow, and carbon footprint were calculated as 6146 M kg, 7451 M m3, and 57909 kg in LID, and varied among the three sub-irrigation areas. Annual CRI in LID was 0.48 and higher than that of the three sub-irrigation areas, and CRI showed an increasing trend as a whole. Agricultural production risks varied under various precipitation conditions. The influence path was meteorological -> resources -> economic -> social -> CRI, among which economic was the main driving factor of the CRI in the dispark WEFC nexus. Therefore, it is more effective to regulate the agricultural economic and decelerate further climate deterioration to prevent and control agricultural production risks.
6 Cao, X.; Zhang, J.; Meng, H.; Lai, Y.; Xu, M. 2023. Remote sensing inversion of water quality parameters in the Yellow River Delta. Ecological Indicators, 155:110914. (Online first) [doi: https://doi.org/10.1016/j.ecolind.2023.110914]
Water quality ; Parameters ; Remote sensing ; Models ; Water resources ; Industrial wastewater ; Sewage / China / Shandong / Dongying / Yellow River Delta / Guangli River
(Location: IWMI HQ Call no: e-copy only Record No: H052260)
https://www.sciencedirect.com/science/article/pii/S1470160X23010567/pdfft?md5=2244fadc05264aa29b391ca748f3bcd8&pid=1-s2.0-S1470160X23010567-main.pdf
https://vlibrary.iwmi.org/pdf/H052260.pdf
https://vlibrary.iwmi.org/pdf/H052260.pdf
(30.40 MB) (30.4 MB)
In recent years, with the rapid socio-economic development of the Yellow River Delta (YRD), the pressure on the supply of water resources has continued to rise. The development of oil-based industries has also led to a series of ecological and environmental problems, such as wetland degradation and water quality deterioration. As an increasing number of rivers are getting polluted, resulting in the deterioration of their water quality, monitoring, managing, and protecting water resources in the YRD is particularly important. In this study, water quality monitoring data and simultaneous Sentinel-2 image data from April 30, 2020, to October 26, 2021, were used to construct an experimental sample in the YRD. Water quality parameters (WQPs) concentrations were correlated with Sentinel-2 image element spectral reflectance and sensitive bands were selected. An empirical method based on the characteristic bands was used to invert a total of six water quality indicators, namely dissolved oxygen (DO), permanganate index (CODMn), ammonia nitrogen (NH3-H), total phosphorus (TP), total nitrogen (TN) and turbidity. The results show: (1) A total of five water quality inversion models for DO, TN, CODMn, TP and TN were effective in the areas of the Guangli River, the Tiaohe and the Branch River. The inversion accuracies of the five inversion models (R2of 0.6099, 0.9271, 0.9581, 0.8784 and 0.7387; RMSE of 1.2723, 0.3413, 0.9923, 0.0118 and 1.8476; RPD of 1.53, 2.08, 3.56, 2.76 and 1.53) indicated the feasibility of the water quality inversion method based on Sentinel-2 data using statistical theory for monitoring water quality concentration in the YRD. (2) The spatial distribution of water quality in the YRD was generally characterized by high water quality in the upper reaches and low water quality in the middle and lower reaches (except for some seasonal variations). Among them, the water quality of the upper reaches of the Guangli River was poor, with opposite trends in DO and TN concentrations. In the Tiaohe, CODMn and TP concentrations were not strongly correlated. However, CODMn and TP concentrations were high in the middle reaches where water quality was the worst. The TN concentrations in the Branch River decreased between 2020 and 2021, but the water quality is still in Category V. Therefore, continued attention and appropriate water quality management measures in the YRD are required. Further, by measuring water quality indicators at monitoring stations, regression-fitting equations for WQPs were established to obtain complementary multi-platform observations. Thus, the water quality conditions in the YRD region can be evaluated more accurately and quickly. The research results not only provide an important reference basis for the identification and monitoring of pollution sources, prevention and treatment of water environment pollution in the YRD, but also provide water security for socio-economic and ecological environment security.
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