优势物种而不是植物生物多样性决定了草地对热浪和刈割的抵抗力和恢复

IF 5.6 1区 环境科学与生态学 Q1 ECOLOGY
Zhaozhao Wang, Xiaobing Dong, Hans J. De Boeck, Gang Dong, Shicheng Jiang, Jingyan Chen, Yalin Hu, Changliang Shao, Lu-Ping Qu
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引用次数: 0

摘要

持续的气候变化增加了热浪等极端气候的频率和强度,影响了陆地生态系统。草原经常受到割草等人类活动的影响,这可能会调节它们对极端气候的反应。然而,这些响应的机制以及在环境干扰下稳定草地功能的重要因素目前尚不清楚。本文以内蒙古克雷洛夫针茅(Stipa krylovii)典型草地(Sti‐Tpl)和羊草草甸草原(Ley‐Mdw)为研究对象,比较了热浪和刈割对羊草功能(基于CO2交换)的影响。记录各草地的生态系统CO2通量和植物群落特征(生物量、群落结构和生物多样性指数)。我们特别关注了两个草原在热浪事件期间草原二氧化碳交换的稳定性(抗性),之后恢复功能的能力(恢复)以及影响这些恢复指标的植物因子。结果表明,碳通量恢复具有非线性的时间轨迹,阻力与恢复之间的相关性较弱。生态系统呼吸(RE)一般比生态系统生产总量(GEP)对热浪表现出更强的抵抗和恢复能力;GEP减少导致净生态系统产量(NEP)减少。然而,当地的割草做法部分地减轻了这些负面影响。优势种重要性值(Iv)和生物多样性对NEP抗性均有正向影响,但对NEP恢复的影响相反,Iv值促进了NEP恢复,而生物多样性降低了NEP恢复。优势种对草地稳定性的贡献程度与其在植物群落中的比例密切相关。合成。在本研究中,我们研究了影响两个不同草原生态系统对热浪和刈割的抵抗和恢复的复杂因素。研究发现,各草地群落优势种的生理、形态和更新特征解释了草地功能稳定性差异的主要原因。因此,为了缓冲生态系统免受极端气候与土地管理的不利影响,将重点放在优势物种的维持或选择上,而不是仅仅放在增加物种丰富度上,可能是有利的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Dominant species rather than plant biodiversity shape grassland resistance and recovery in response to heatwaves and mowing

Dominant species rather than plant biodiversity shape grassland resistance and recovery in response to heatwaves and mowing

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来源期刊
Journal of Ecology
Journal of Ecology 环境科学-生态学
CiteScore
10.90
自引率
5.50%
发文量
207
审稿时长
3.0 months
期刊介绍: Journal of Ecology publishes original research papers on all aspects of the ecology of plants (including algae), in both aquatic and terrestrial ecosystems. We do not publish papers concerned solely with cultivated plants and agricultural ecosystems. Studies of plant communities, populations or individual species are accepted, as well as studies of the interactions between plants and animals, fungi or bacteria, providing they focus on the ecology of the plants. We aim to bring important work using any ecological approach (including molecular techniques) to a wide international audience and therefore only publish papers with strong and ecological messages that advance our understanding of ecological principles.
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