Effects of sub-monthly and sub-daily water level variations on water level fluctuation requirements of Phragmites australis and Phalaris arundinacea

IF 5.1 Q1 ENVIRONMENTAL SCIENCES
Tingyu Zhang , Wenjuan Gao , Saibo Yuan , Xiaodie Jiang , Yongjing Zhao , Yongde Cui , Hongzhu Wang
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引用次数: 0

Abstract

Water level variations (WLVs) substantially affect the spatial distribution of riparian vegetation. Accurately quantifying the water level fluctuation requirements (WLFRs) of aquatic macrophytes is essential for effective ecological water level management. Nevertheless, studies on the WLFRs of herbaceous plants in large river floodplains, such as Phragmites australis (common reed) and Phalaris arundinacea (reed canarygrass), are limited. Herein, we investigated the WLFRs of the two plants across water bodies with different WLVs in the Yangtze River Basin. We focused on the effects of sub-monthly and sub-daily WLVs on their average monthly water depth requirements (WDRs) during critical growth periods. Our findings indicated: (1) For Phragmites, during the emergence period, the upper limits of WDRs decreased with increased amplitudes of sub-monthly WLVs and with greater frequency and amplitude of sub-daily WLVs, in which sub-daily variations had a more pronounced effect. Conversely, during the rapid growth period, the upper limits increased with larger sub-monthly WLVs amplitudes, but decreased with higher frequency and amplitude of sub-daily WLVs. (2) For Phalaris, during both the emergence and rapid growth periods, intensified sub-daily WLVs led to decreased upper limits of WDRs. In summary, although distinct disparities existed in the WLFRs of Phragmites and Phalaris across various water bodies, the trends in WDRs during the emergence and rapid growth periods were consistent for both species. These findings provide essential quantitative data to restore aquatic vegetation and carry out effective ecological water level management in large-scale riparian ecosystems.
亚月和亚日水位变化对芦苇和蝴蝶兰水位波动需求的影响
水位变化对河岸植被的空间分布有重要影响。准确量化水生植物的水位波动需求是有效进行生态水位管理的必要条件。然而,对大型河漫滩草本植物,如芦苇(Phragmites australis)和芦苇金丝雀(Phalaris arundinacea)的wlfr研究有限。在此基础上,研究了两种植物在长江流域不同WLVs水体中的wlfr。我们重点研究了在关键生长期,亚月和亚日wlv对其月平均水深需求(wdr)的影响。结果表明:(1)芦苇在羽化期,wdr的上限随着亚月WLVs的增加和亚日WLVs的频率和幅度的增加而降低,其中亚日变化的影响更为明显。相反,在快速增长期,上限随着亚月wlv振幅的增大而增大,但随着亚日wlv频率和振幅的增大而减小。(2)无论是初出期还是快速生长期,长尾蓝的亚日WLVs都在加剧,导致wdr上限降低。综上所述,尽管芦苇和Phalaris的wldrs在不同水体中存在明显差异,但两种植物在发育期和快速生长期的wdr趋势是一致的。这些研究结果为大规模河岸生态系统水生植被的恢复和有效的生态水位管理提供了必要的定量数据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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4.10
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