Water use efficiency of China's karst ecosystems: The effect of different ecohydrological and climatic factors

Zhou, Xu; Ao, Yang; Jiang, Xiao; Yang, Shengtian; Hu, Yuxue; Wang, Xiaohua; Zhang, Ji

doi:10.1016/j.scitotenv.2023.167069

Cited by 7 publications

(2 citation statements)

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“…In contrast, the other tributary (Nianchu River) is densely populated with facility agriculture [15], indicating that the main source of pollution is agricultural non-point source pollution. Overall, the YZRB exhibits ancient karst geological characteristics [16]. From September to October 2021, water samples (n = 75) were collected and presented as Y1-20 (YZR's mainstream), L1-14 (Lhasa River), and N1-41 (Nianchu River).…”

Section: Study Areamentioning

confidence: 99%

“…Interestingly, both As and Mo elements exhibited a high value of distribution in the Duilongqu Basin, where geothermal resources are widely distributed. Considering that YZRB is an ancient karst region, with huge potential for Fe and Mn deposits [16,[50][51][52], F3 could be identified as a lithological source and geothermal wastewater (47.418%). Factor 4 (F4) was mainly loaded on Hg, Se, V, and Zn.…”

Section: Source Analysis Of Pmf Modelmentioning

confidence: 99%

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Concentration, Spatial Distribution, and Source Analysis of Trace Elements in the Yarlung Zangbo River Basin and Its Two Tributaries

Xiao,

Zhao,

et al. 2023

Water

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The Yarlung Zangbo River (YZR) is the longest plateau river in China and has famous tributaries, the Lhasa River and the Nianchu River. A total of 75 water samples were collected from the Yarlung Zangbo River Basin (YZRB) in this study to investigate the dissolved concentration, spatial distribution, and source of trace elements (Fe, V, Be, Ti, Mo, Se, Cd, Zn, Cu, Ni, Co, Mn, Cr, Ba, Tl, Pb, Hg, As, and Sb). The results indicate that only Cr and Tl contaminate water, while the other trace elements were in an unpolluted state. In addition, correlation analysis showed that there was a highly significant positive correlation between the concentrations of As, Sb, and Mo; there was also a highly significant positive correlation between the concentrations of Fe, Mn, Ti, Pb, Ni, Co, and Ba. The results of Positive Matrix Factorization (PMF) showed that there were four sources of trace elements in the YZRB, including the resuspension and dissolution of sediments (16.283%), agricultural source (11.436%), lithological source (47.418%), and soil-forming rocks (6.374%). Cluster analysis combined with PMF normalized contribution analysis, which showed that the trace elements found in the YZR’s mainstream were predominantly influenced by the surrounding rocks composition. Meanwhile, both the discharge of mining wastewater and sediments were marked in the Lhasa River. Additionally, agricultural activities were the chief contributors to the trace elements in the Nianchu River. Furthermore, the entire basin was subjected to the influence of soil-forming rocks. This study comprehensively analyzed and evaluated the physicochemical properties of water, the spatial distribution, and the pollution degree, and performed source analysis of trace elements in the YZRB. This research provides a foundational reference for further investigation of the spatial distribution and origins of trace elements in the rivers of the Qinghai–Tibet Plateau (QTP).

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Section: Study Areamentioning

confidence: 99%