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Northwest University, college of Urban and Environmental Sciences
Crop production with intensive water use is burdening global water resources system. From the perspective of production, this study focuses on investigating world's water challenge from crop cultivation based on a 26-yr multi-scale analysis. Blue water footprint (BWF) dynamics covering 146 crops over 180 countries are examined during 1992–2017, applying a fast-track based BWF assessment and a modified dynamic decomposition analysis (DDA). Results show that global crop BWF has increased by 10.8% during 1992–2017 with increased growth rate after 2002, indicating rising water pressure from crop farming. About three-fifths of world's regions/nations have grown crop BWFs, especially in Southeast Asia, Oceania, and North-Central-West Africa (grown by over 30% each). Absolute changing rates of national crop BWFs trend to increase along with the decrease of population and BWF scales, with developing countries presenting large crop BWF increases, especially India, Pakistan, and Egypt (> 9 billion m3 each). The crop BWF growths come mainly from the farming of fruits, cereals, and sugar crops, with contribution proportions of 32.4%, 19.6%, and 12.8%, respectively. Decomposition results show that world's growing crop BWF is dominantly driven by population (27.5%) and yield-improving technology (24.8%) while water-saving technology (-24.8%) and proportion of rural population (-18.9%) contribute to offsetting the BWF growth. Efforts towards water sustainable cropping should be made in technological development and planting structure adjustment, especially in those countries with high or largely grown BWFs. Based on these, we expect to provide useful and informative findings for building a better water conservation system on earth.
Chi Ma; Zhongwen Yang; Rui Xia; Jinxi Song; Chengjian Liu; Ruichen Mao; Mingyue Li; Xin Qin; Cailian Hao; Ruining Jia. Rising water pressure from global crop production—A 26-yr multiscale analysis. Resources, Conservation and Recycling 2021, 172, 105665 .
AMA StyleChi Ma, Zhongwen Yang, Rui Xia, Jinxi Song, Chengjian Liu, Ruichen Mao, Mingyue Li, Xin Qin, Cailian Hao, Ruining Jia. Rising water pressure from global crop production—A 26-yr multiscale analysis. Resources, Conservation and Recycling. 2021; 172 ():105665.
Chicago/Turabian StyleChi Ma; Zhongwen Yang; Rui Xia; Jinxi Song; Chengjian Liu; Ruichen Mao; Mingyue Li; Xin Qin; Cailian Hao; Ruining Jia. 2021. "Rising water pressure from global crop production—A 26-yr multiscale analysis." Resources, Conservation and Recycling 172, no. : 105665.
The bioturbation activity of macroinvertebrates can affect the level of water exchange across the sediment–water interface. The impact of tubificid worm with different densities on the vertical water exchange at the sediment–water interface was investigated based on laboratory flume experiments. Vertical water fluxes, as well as physiochemical parameters, were measured at seven-day intervals, and the maximum penetration depths were obtained by dye injection before and after the tubificid bioturbation experiment, respectively. The bioturbation effects can be summarized in two aspects: (1) when the density was less than (or equal to) 20 individual/10 cm2, the volume of vertical water exchange positively correlated with the tubificid bioturbation. Once the density exceeded (or equaled) 25 individual/10 cm2, the vertical water flux decreased with increasing tubificid bioturbation. After 14 to 21 days, a negative correlation was identified between the bioturbation and the vertical water flux under all biological densities. (2) The maximum depth that the surface water can penetrate the sediment increased with increasing tubificid density. These results revealed that the vertical water was closely related to the biological density. The study has certain reference significance to understanding the spatiotemporal heterogeneity of hyporheic water exchange on a local scale.
Ruichen Mao; Jintao Wu; Xin Qin; Chi Ma; Jinxi Song; Dandong Cheng; Haotian Sun; Mingyue Li. The Effect of Tubificid Bioturbation on Vertical Water Exchange across the Sediment–Water Interface. Water 2020, 12, 3467 .
AMA StyleRuichen Mao, Jintao Wu, Xin Qin, Chi Ma, Jinxi Song, Dandong Cheng, Haotian Sun, Mingyue Li. The Effect of Tubificid Bioturbation on Vertical Water Exchange across the Sediment–Water Interface. Water. 2020; 12 (12):3467.
Chicago/Turabian StyleRuichen Mao; Jintao Wu; Xin Qin; Chi Ma; Jinxi Song; Dandong Cheng; Haotian Sun; Mingyue Li. 2020. "The Effect of Tubificid Bioturbation on Vertical Water Exchange across the Sediment–Water Interface." Water 12, no. 12: 3467.
A healthy aquatic ecosystem plays an important role in the operation of nature and the survival of human beings. Understanding the mechanism of its interaction with the habitat process is conducive to formulating targeted ecological recovery plans. In this study, fish and macroinvertebrates were collected from 49 investigation sites in the Weihe River basin, China, during periods of the summer and the autumn of 2017. Cluster analysis and canonical correlation analysis (CCA) were used to analyze the similarity of community distribution of fish and macroinvertebrates and their response to environmental variables. The biological integrity index of fish (F-IBI) and benthic-macroinvertebrate (B-IBI) was introduced to evaluate the aquatic ecological health. The results showed that fish communities were more coherent than macroinvertebrate communities. The distinguished response to ecological factors was identified for fish and macroinvertebrates. The ecological factors of total nitrogen, conductivity and river width have significant effects on both fish and macroinvertebrate communities. In addition, the fish community was significantly influenced by chlorine, fluorine, pH and flow velocity, while the macroinvertebrate community was significantly influenced by bicarbonate and water depth. The differences in community structure and response to ecological factors between communities were amplified in their environmental quality scores. Although F-IBI and B-IBI tend to be consistent temporally, the correlation is not significant. B-IBI showed decreasing gradient of ecological health status in the downstream area, while F-IBI tended to be different across river systems, which further illustrated the differences in the response of fish and macroinvertebrates to environmental variables.
Jintao Wu; Ruichen Mao; Mingyue Li; Jun Xia; Jingxi Song; Dandong Cheng; Haotian Sun. Assessment of aquatic ecological health based on determination of biological community variability of fish and macroinvertebrates in the Weihe River Basin, China. Journal of Environmental Management 2020, 267, 110651 .
AMA StyleJintao Wu, Ruichen Mao, Mingyue Li, Jun Xia, Jingxi Song, Dandong Cheng, Haotian Sun. Assessment of aquatic ecological health based on determination of biological community variability of fish and macroinvertebrates in the Weihe River Basin, China. Journal of Environmental Management. 2020; 267 ():110651.
Chicago/Turabian StyleJintao Wu; Ruichen Mao; Mingyue Li; Jun Xia; Jingxi Song; Dandong Cheng; Haotian Sun. 2020. "Assessment of aquatic ecological health based on determination of biological community variability of fish and macroinvertebrates in the Weihe River Basin, China." Journal of Environmental Management 267, no. : 110651.