Stable isotopic analysis of water utilization characteristics of four xerophytic shrubs in the Hobq Desert, Northern China

Frontiers in Plant Science

Plant Science

Wu Yongsheng¹  Gao Li²  Wang Hui²  Yin Qiang²  Liao Zilong³  Yu Xiangqian⁴ 

[1] College of Geographical Science, Inner Mongolia Normal University, Hohhot, China;Institute of Water Resources for Pastoral Area, China Institute of Water Resources and Hydropower Research, Hohhot, China;Institute of Grassland Research, Chinese Academy of Agricultural Sciences, Hohhot, China;Institute of Water Resources for Pastoral Area, China Institute of Water Resources and Hydropower Research, Hohhot, China;Institute of Water Resources for Pastoral Area, China Institute of Water Resources and Hydropower Research, Hohhot, China;School of Earth Sciences and Engineering, Hohai University, Nanjing, China;

关键词: stable isotope;    water utilization;    water source;    xerophytic shrubs;    Hobq desert;   

DOI  :  10.3389/fpls.2023.1103789

 received in 2022-11-23, accepted in 2023-05-17,  发布年份 2023

来源: Frontiers

【 摘 要 】

Quantitative identification of water utilization characteristics of xerophytic shrubs is an important prerequisite for the selection and optimization of a regional artificial sand-fixing vegetation system. In this study, a hydrogen (δD) stable isotope technique was used to study the changes in water use characteristics of four typical xerophytic shrubs, Caragana korshinskii, Salix psammophila, Artemisia ordosica, and Sabina vulgaris in the Hobq Desert under light (4.8 mm after 1 and 5 days) and heavy (22.4 mm after 1 and 8 days) rainfall events. Under light rainfall, C. korshinskii and S. psammophila primarily used the 80–140 cm layer of soil water (37–70%) and groundwater (13–29%), and the water use characteristics did not change significantly after the light rainfall event. However, the utilization ratio of A. ordosica to soil water in the 0–40 cm layer increased from less than 10% on the first day after rain to more than 97% on the fifth day after rain, whereas the utilization ratio of S. vulgaris to soil water in the 0–40 cm layer also increased from 43% to nearly 60%. Under heavy rainfall, C. korshinskii and S. psammophila still used the 60–140 cm layer (56–99%) and groundwater (~15%), while the main water utilization depth of A. ordosica and S. vulgaris expanded to 0–100 cm. Based on the above results, C. korshinskii and S. psammophila primarily use the soil moisture of the 80–140 cm layer and groundwater, while A. ordosica and S. vulgaris use the soil moisture of the 0–100 cm layer. Therefore, the co-existence of A. ordosica and S. vulgaris will increase the competition between artificial sand-fixing plants, while the combination of the two plants with C. korshinskii and S. psammophila will avoid competition between artificial sand-fixing plants to some extent. This study provides important guidance for regional vegetation construction and sustainable management of an artificial vegetation system.

【 授权许可】

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Copyright © 2023 Yongsheng, Zilong, Xiangqian, Qiang, Hui and Li