Your search found 3 records
1 He, H.. 1992. Features of irrigation organization structure under the production system of "small scale integrated farming" In Feyen, J.; Mwendera, E.; Badji, M. (Eds.), Advances in planning, design and management of irrigation systems as related to sustainable land use: Proceedings of an International Conference organized by the Center for Irrigation Engineering of the Katholieke Universiteit Leuven in cooperation with the European Committee for Water Resources Management, Leuven, Belgium, 14-17 September 1992. Vol. 1. Leuven, Belgium: Center for Irrigation Engineering. pp.93-98.
(Location: IWMI-HQ Call no: 631.7.1 G000 FEY Record No: H014339)
2 Li, C.; Gan, Y.; Zhang, C.; He, H.; Fang, J.; Wang, L.; Wang, Y.; Liu, J. 2021. "Microplastic communities" in different environments: differences, links, and role of diversity index in source analysis. Water Research, 188:116574. [doi: https://doi.org/10.1016/j.watres.2020.116574]
Microplastics ; Communities ; Freshwater ecosystems ; Marine environment ; Sea water ; Sediment ; Soil pollution ; Water pollution ; Polymers ; Risk assessment / China
(Location: IWMI HQ Call no: e-copy only Record No: H050135)
(2.95 MB)
Microplastics have been detected in various environments, yet the differences between microplastics in different environments are still largely unknown. Scientists have proposed the concept of the “microplastic cycle,” but the evidence for the movement of microplastics between different environments is still scarce. By screening the literature and extracting information, we obtained microplastic data from 709 sampling sites in freshwater, seawater, freshwater sediment, sea sediment, and soil in China. Based on the similarity between microplastics and biological communities, here we propose the concept of a “microplastic community” and examine the differences, links, and diversity of microplastic communities in different environments. Wilcoxon sign-ranks test, Kruskal-Wallis test, and analysis of similarities (ANOSIM) showed that there were significant differences in abundance, proportion of small microplastics, and community composition (shape, color, and polymer types) of microplastics in different environments. The Mantel test showed that there were significant correlations between microplastic community composition in different environments. Network analysis based on community similarity further confirmed the links between microplastic communities. The distance decay models revealed that the links weakened with the increase of geographic distance, suggesting that sampling sites with closed geographical locations had similar pollution sources and more easily to migrate or exchange microplastics. The microplastic diversity integrated index (MDII) was established based on the diversity of microplastic shape, color, and polymer types, and its indication of the number of microplastic pollution sources was verified by the statistical fitting relationship between the number of industrial pollution sources and MDII. Our study provides new insight into the differences and links between microplastics in different environments, which contributes to the microplastic risk assessment and demonstrates the “microplastic cycle.” The establishment of the microplastic diversity integrated index could be used in source analysis of microplastics.
3 Shi, H.; Luo, G.; Zheng, H.; Chen, C.; Hellwich, O.; Bai, J.; Liu, T.; Liu, S.; Xue, J.; Cai, P.; He, H.; Ochege, F. U.; Van de Voorde, T.; de Maeyer, P. 2021. A novel causal structure-based framework for comparing a basin-wide water-energy-food-ecology nexus applied to the data-limited Amu Darya and Syr Darya river basins. Hydrology and Earth System Sciences, 25(2):901-925. [doi: https://doi.org/10.5194/hess-25-901-2021]
Water resources ; Energy ; Food security ; Ecology ; Nexus ; River basins ; Downstream ; Upstream ; Reservoirs ; International waters ; Water use ; Conflicts ; Agricultural production ; Models / Central Asia / Aral Sea Basin / Amu Darya River Basin / Syr Darya River Basin
(Location: IWMI HQ Call no: e-copy only Record No: H050537)
https://hess.copernicus.org/articles/25/901/2021/hess-25-901-2021.pdf
https://vlibrary.iwmi.org/pdf/H050537.pdf
https://vlibrary.iwmi.org/pdf/H050537.pdf
(17.90 MB) (17.9 MB)
The previous comparative studies on watersheds were mostly based on the comparison of dispersive characteristics, which lacked systemicity and causality. We proposed a causal structure-based framework for basin comparison based on the Bayesian network (BN) and focus on the basin-scale water–energy–food–ecology (WEFE) nexus. We applied it to the Syr Darya River basin (SDB) and the Amu Darya River basin (ADB), of which poor water management caused the Aral Sea disaster. The causality of the nexus was effectively compared and universality of this framework was discussed. In terms of changes in the nexus, the sensitive factor for the water supplied to the Aral Sea changed from the agricultural development during the Soviet Union period to the disputes in the WEFE nexus after the disintegration. The water–energy contradiction of the SDB is more severe than that of the ADB, partly due to the higher upstream reservoir interception capacity. It further made management of the winter surplus water downstream of the SDB more controversial. Due to this, the water–food–ecology conflict between downstream countries may escalate and turn into a long-term chronic problem. Reducing water inflow to depressions and improving the planting structure prove beneficial to the Aral Sea ecology, and this effect of the SDB is more significant. The construction of reservoirs on the Panj River of the upstream ADB should be cautious to avoid an intense water–energy conflict such as the SDB's. It is also necessary to promote the water-saving drip irrigation and to strengthen the cooperation.
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