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干旱对毛乌素沙地纯灌丛和混交灌丛水分利用策略的影响

Effects of Drought on the Water Use Strategies of Pure and Mixed Shrubs in the Mu Us Sandy Land.

作者信息

Gao Qin, Dang Xiaohong, Meng Zhongju, Liu Yang, Lou Jiale, Yan Yu, Zhang Xing

机构信息

College of Desert Control Science and Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China.

Inner Mongolia Hangjin Desert Ecosystem National Positional Research Station, Ordos 017400, China.

出版信息

Plants (Basel). 2024 Nov 21;13(23):3261. doi: 10.3390/plants13233261.

Abstract

Water resources are crucial factors that limit vegetation recovery, and rational planning of silvicultural patterns is essential for the efficient utilization of water in arid and semi-arid regions. This study examined the water utilization strategies of pure shrubs (pure stands of and pure stands of ) and mixed shrubs (mixed stands of , and mixed stands of ) from the rainy to dry seasons using stable isotope techniques and MixSIAR modeling in the Mu Us Sandy Land in the semi-arid region of China. Mixed shrubs were significantly more effective than pure shrubs in utilizing the primary water sypply from the soil layer. During the rainy season in August, shallow soil water was used to a greater extent, contributing 33.78 ± 2.18%, with no significant difference in the contribution proportion. After a brief drought during the transition period in September, there was a significant increase in the use of the primary water-absorbing soil layer across all vegetation types, with a maximum increase of 39.53%. Conversely, during the dry season in October, after an extended drought, the contribution of the primary water supply layer to vegetation water absorption decreased compared with the transition period, with a maximum increase of only 17.88%. The results of this study revealed that variations in water conditions and vegetation configurations influence the water utilization patterns of the vegetation. This study offers a scientific basis and theoretical support for understanding ecological water use, the rationale behind vegetation establishment, and an assessment of plantation community stability in sandy regions.

摘要

水资源是限制植被恢复的关键因素,合理规划造林模式对于干旱和半干旱地区水资源的高效利用至关重要。本研究利用稳定同位素技术和MixSIAR模型,在中国半干旱地区毛乌素沙地,研究了从雨季到旱季纯灌木(柠条纯林和沙柳纯林)和混交灌木(柠条与沙柳混交林、沙柳与油蒿混交林)的水分利用策略。混交灌木在利用土壤层主要水源方面比纯灌木显著更有效。8月雨季期间,浅层土壤水的利用程度更高,贡献率为33.78±2.18%,贡献率比例无显著差异。9月过渡期短暂干旱后,所有植被类型对主要吸水土壤层的利用显著增加,最大增幅为39.53%。相反,10月旱季,在长期干旱后,主要供水层对植被吸水的贡献率与过渡期相比有所下降,最大增幅仅为17.88%。本研究结果表明,水分条件和植被配置的变化影响植被的水分利用模式。本研究为理解沙地生态用水、植被建立的原理以及人工林群落稳定性评估提供了科学依据和理论支持。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9f89/11644808/3a9f7e1f90d3/plants-13-03261-g001.jpg

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