湖泊水位长期下降后暴露的河流三角洲平原上维管植物的演替。33年的课程

IF 0.4 4区 环境科学与生态学 Q4 ECOLOGY
A. Odland
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引用次数: 0

摘要

摘要:永久性的湖泊水位下降会在裸露的沉积物上引发植被演替。本研究旨在量化沉积物在时间(水位下降后的年数)和空间(新水位以上的高程)方面的长期维管植物变化。在挪威西部Myrkdalen湖1.4米的永久性水位下降后不久,建立了一条40米长的样带,从最初的最低植被向新的水位延伸。2 m2研究地块中的物种覆盖率通过视觉估计确定,并从1988年到2020年进行数据采样;总共19次。在研究期间,平均丰富度和植物覆盖率随时间和空间变化显著。水疱苔草和狭叶苔草的数量逐渐增加,尤其是在下部。DCA排序量化的演替变化在最初的15-20年中表现出快速变化,但后来植被似乎更加稳定。高程以线性方式解释了平均区系变化,而二次模型更好地解释了与时间有关的变化。夏季和六月水位的变化解释了研究期间序列变化的一小部分。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Vascular Plant Succession on an Exposed Fluvial Delta Plain After a Permanent Lake Water Level Drawdown. A 33-Year Time Course
ABSTRACT A permanent lake water level drawdown initiates a vegetation succession on exposed sediments. This study aims to quantify long-term vascular plant changes on the sediments in time (number of years after drawdown) and space (elevation above the new water level). Shortly after a 1.4 m permanent drawdown of Myrkdalen lake, W Norway, a 40 m long transect running from the original lowermost vegetation toward the new water level was established. Species cover percentages in the 2 m2 study plots were determined by visual estimates and data sampling was performed from 1988 until 2020; in total, 19 times. During the study period both mean richness and plant percentage cover varied significantly in relation to space and time. Carex vesicaria and Phalaris arundinacea increased gradually especially in the lower parts. The successional changes as quantified by a DCA ordination showed rapid changes during the first 15-20 years, but later the vegetation appeared to be more stabilized. Elevation explained the mean floristic variation in a linear fashion while a quadratic model better explained the variation in relation to time. Variation in summer and June water level explained a small part of the succession change during the study period.
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来源期刊
Polish Journal of Ecology
Polish Journal of Ecology 环境科学-生态学
CiteScore
1.10
自引率
0.00%
发文量
9
审稿时长
18-36 weeks
期刊介绍: POLISH JOURNAL OF ECOLOGY (formerly Ekologia polska) publishes original scientific research papers dealing with all aspects of ecology: both fundamental and applied, physiological ecology, evolutionary ecology, ecology of population, community, ecosystem, landscape as well as global ecology. There is no bias regarding taxons, ecosystems or geographical regions.
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