Preprints
https://doi.org/10.5194/bg-2023-1
https://doi.org/10.5194/bg-2023-1
06 Feb 2023
 | 06 Feb 2023
Status: this discussion paper is a preprint. It has been under review for the journal Biogeosciences (BG). The manuscript was not accepted for further review after discussion.

Human activities determine vegetation water use in the middle and lower reaches of arid areas

Siyu Lu, Guofeng Zhu, Rui Li, Yinying Jiao, Gaojia Meng, Dongdong Qiu, Yuwei Liu, Lei Wang, Xinrui Lin, Yuanxiao Xu, Qinqin Wang, and Longhu Chen

Abstract. In the middle and lower reaches of inland river basins of arid regions, human-intensive exploitation directly determines the distribution patterns of plants in arid areas and further determines the patterns of water use and the water cycle in arid regions. However, human activities on vegetation water utilization and the influence of the water cycle process and mechanism are not clear. In this study, seven observation systems were set up to collect samples in the mountainous, oasis and desert areas of the Shiyang River Basin, an arid inland river in central Asia. In order to quantitatively assess the contribution of different potential water sources to plants, stable isotopes of various water bodies in different geomorphic units of the basin were analyzed. The results showed that precipitation and soil water were the main sources of forest trees in mountainous areas, and the farmland vegetation in the middle and lower reaches of the oasis mainly absorbed soil water supplied by irrigation. The desert area forms vegetation in the ecological water transport area, and vegetation mainly absorbs soil water, lake water and groundwater formed by ecological water transport. On the whole, the water use patterns of plants in mountainous areas are not affected by human activities fundamentally, the oasis area is mainly affected by irrigation activities, and the inland river terminal lake area is mainly affected by ecological water transport. Human activities determine the water use patterns in the middle and lower reaches of inland rivers in arid areas.

Publisher's note: Copernicus Publications remains neutral with regard to jurisdictional claims made in the text, published maps, institutional affiliations, or any other geographical representation in this preprint. The responsibility to include appropriate place names lies with the authors.
Siyu Lu, Guofeng Zhu, Rui Li, Yinying Jiao, Gaojia Meng, Dongdong Qiu, Yuwei Liu, Lei Wang, Xinrui Lin, Yuanxiao Xu, Qinqin Wang, and Longhu Chen

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on bg-2023-1', Anonymous Referee #1, 12 May 2023
    • AC1: 'Reply on RC1', Guofeng Zhu, 19 Jun 2023
  • RC2: 'Comment on bg-2023-1', Anonymous Referee #2, 02 Jun 2023
    • AC2: 'Reply on RC2', Guofeng Zhu, 19 Jun 2023

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on bg-2023-1', Anonymous Referee #1, 12 May 2023
    • AC1: 'Reply on RC1', Guofeng Zhu, 19 Jun 2023
  • RC2: 'Comment on bg-2023-1', Anonymous Referee #2, 02 Jun 2023
    • AC2: 'Reply on RC2', Guofeng Zhu, 19 Jun 2023
Siyu Lu, Guofeng Zhu, Rui Li, Yinying Jiao, Gaojia Meng, Dongdong Qiu, Yuwei Liu, Lei Wang, Xinrui Lin, Yuanxiao Xu, Qinqin Wang, and Longhu Chen
Siyu Lu, Guofeng Zhu, Rui Li, Yinying Jiao, Gaojia Meng, Dongdong Qiu, Yuwei Liu, Lei Wang, Xinrui Lin, Yuanxiao Xu, Qinqin Wang, and Longhu Chen

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Short summary
The study shows that precipitation and soil water are the most important sources for forest trees in the mountainous areas, and that agricultural vegetation in the middle and lower oasis areas mainly absorbs soil water recharged by irrigation. The desert area forms vegetation in the ecological water transfer area, and the vegetation mainly absorbs soil water, lake water and groundwater formed by ecological water transfer.
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