伊朗-图兰草原重要种高加索针茅种子萌发对苔藓和地衣结壳的响应对比

IF 1 4区 生物学 Q3 PLANT SCIENCES Folia Geobotanica Pub Date : 2022-01-14 DOI:10.1007/s12224-021-09402-x
Negar Ahmadian, Mehdi Abedi, Mohamad Sohrabi, Sergey Rosbakh
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引用次数: 2

摘要

生物土壤结皮在干旱生态系统功能中起着至关重要的作用,但其性质(如是否以苔藓和地衣为主)对土壤萌发的影响却很少被研究。本研究分析了完整、死亡和去除苔藓或地衣BSC对伊朗黄花蒿(Stipa caucasica)种子萌发的影响。我们的研究结果表明,死苔藓和完整苔藓的BSC都显著和强烈地降低和延迟了种子的萌发,这可能是由于结皮的物理性质限制了对中心物种大种子的供水。此外,我们发现完整的地衣BSC对所研究的发芽率没有显著影响,而地衣BSC去除和热处理(“死”的BSC)降低了发芽率。这种减少很可能是由于化感作用和地衣外壳的表面特性。结果表明,青苔和地衣BSC在草原高加索种子再生中起着不同的作用;然而,对物种种群动态的影响值得进一步研究,包括幼苗建立的后期。
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Contrasting seed germination response to moss and lichen crusts in Stipa caucasica, a key species of the Irano-Turanian steppe

Biological soil crusts (BSC) play a crucial role in arid ecosystem functioning, yet the effect of their properties (e.g. whether they are dominated by mosses and lichens) on the germination has rarely been investigated. Here, we analysed the effects of intact, dead and removed moss or lichen BSC on seed germination of Stipa caucasica, a key species in the Iranian Artemisia steppes. Our results revealed that both dead and intact moss BSC significantly and strongly reduced and delayed germination putatively due to the physical properties of the crust limiting water supply to the large seeds of the focal species. Further, we found out that intact lichen BSC had no significant effect on the germination traits studied whereas lichen BSC removal and heat treatment (‘dead’ BSC) reduced germination percentage. The reduction is most likely due to the allelopathy effects and surface properties of the lichen crust. The detected patterns suggest that moss and lichen BSC play different roles in S. caucasica seed regeneration in the steppe; however, the effect on the species population dynamics deserve further study including also later stages of seedling establishment.

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来源期刊
Folia Geobotanica
Folia Geobotanica 生物-植物科学
CiteScore
2.40
自引率
0.00%
发文量
18
审稿时长
>12 weeks
期刊介绍: The journal Folia Geobotanica publishes articles in vegetation science, plant ecology and plant systematics, including the topics of temporal community patterns, population and ecosystem ecology, and invasion and conservation ecology. Within the field of plant systematics, Folia Geobotanica welcomes papers on systematic and evolutionary botany, including phylogenetic reconstructions, phylogeographic and biogeographic inferences, studies of microevolutionary processes, taxonomic studies, and broader taxonomic revisions.
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