Journal of Plant Ecology ›› 2021, Vol. 14 ›› Issue (2): 337-347.DOI: 10.1093/jpe/rtaa091

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  • 收稿日期:2020-07-01 修回日期:2020-07-31 接受日期:2020-11-05 出版日期:2021-03-01 发布日期:2021-03-15

The effect of temperature changes and K supply on the reproduction and growth of Bolboschoenus planiculmis

Ying Liu1,2, Christoph Bachofen3,4, Yanjing Lou2, *, Zhi Ding5, *, Ming Jiang2, Xianguo Lü2 and Nina Buchmann3   

  1. 1 The Three Gorges Institute of Ecological Environment, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China, 2 Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130012, China, 3 Institute of Agricultural Sciences, Department of Environmental Systems Science, ETH Zürich, Zürich 8092, Switzerland, 4 Plant Ecology Research Lab—PERL, Environmental Engineering Institute, School of Architecture, Civil and Environmental Engineering, EPFL Lausanne, Lausanne 1015, Switzerland, 5 Key Laboratory of Geospatial Technology for the Middle and Lower Yellow River Regions, College of Environment and Planning, Henan University, Kaifeng 475004, China

    *Corresponding author. E-mail: louyj@iga.ac.cn (Y.L.); dingzhi11@mails.ucas.ac.cn (Z.D.)
  • Received:2020-07-01 Revised:2020-07-31 Accepted:2020-11-05 Online:2021-03-01 Published:2021-03-15

摘要: 温度变化和钾添加对扁秆藨草生长及繁殖的影响
人类活动导致的气候变暖和农业面源污染已被认为是影响湿地植物生长和繁殖的重要因素。为了预 测和缓解这些人类活动的影响,研究沼泽植物如何响应这些环境变化具有重要意义。本研究选取在欧亚 大陆广泛分布的莎草科球茎植物扁秆藨草(Bolboschoenus planiculmis)为研究对象,考察气温变化(恒温: 15、20、25 °C及交替温度:20/10和30/15 °C)和钾添加(0、1、3、9 和18 mmol/L)对其生长和繁殖性状 的影响。研究结果表明,高的恒温(20、25 °C)比高的交替温度(30/15 °C)更有利于扁秆藨草球茎的形成, 而地上生物量和株高一般在较高温度下(30/15、25 °C)达到最大值。扁秆藨草的繁殖和生长性状均与施钾量 呈驼峰型关系,最适施钾量在1–3 mmol/L K。高恒温效应和最适钾浓度的交互作用对繁殖性状的促进作 用最大,但是,较高的温度(30/15和25 °C)和0–9 mmol/L的钾浓度只促进了生长性状的生长。综上所述, 扁秆藨草的种群优势度可能受益于全球变暖和额外的钾添加。

关键词: 气候变暖, 面源污染, 功能性状, 克隆繁殖, 湿地植物, 沼泽

Abstract:

Aims

Climate warming and agricultural non-point source pollution both resulting from anthropogenic activities have been projected to affect plant reproduction and growth in wetlands worldwide. In order to predict and mitigate impacts of these anthropogenic activities, it is important to investigate how marsh plants respond to such environmental changes.

Methods

In this study, Bolboschoenus planiculmis, a tuberous sedge with a wide distribution range in Eurasia, was selected to examine the effect of air temperature changes (15, 20 and 25 °C over 24 h; 20/10 and 30/15 °C, day/night) and K supply (0, 1, 3, 9 and 18 mmol/L) on its reproductive and growth traits in climate chambers.

Important Findings

We found that high constant temperatures (20 and 25 °C) were more beneficial for tuberization of B. planiculmis than high alternating temperatures (30/15 °C), whereas aboveground biomass and shoot height were generally largest at high temperatures (30/15 and 25 °C). Both reproductive and growth traits of B. planiculmis showed hump-shaped relationships with K supply, with an optimum K concentration of around 1–3 mmol/L. The combination of high constant temperatures and optimal K concentrations promoted reproductive traits the most, whereas the combination of higher temperatures (30/15 and 25 °C) and K concentrations up to 9 mmol/L increased growth traits only. We therefore conclude that population abundance of B. planiculmis might benefit from global warming and the additional K supply.

Key words: climate warming, non-point source pollution, functional traits, clonal reproduction, wetland plants, marsh