Soil Moisture Is the Key Factor Facilitating Giant Ragweed Invasions in Grasslands of the Yili Vally, China.

IF 3.6 3区 生物学 Q1 BIOLOGY
Xinyi Chen, Zhanli Song, Baoxiong Chen, Wanli Yu, Hegan Dong
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引用次数: 0

Abstract

Giant ragweed (GR; Ambrosia trifida L.), an invasive alien species, causes significant harm to grassland ecosystems and farmlands in some areas but is challenging to control. GR has invaded the hilly grasslands of Yili Valley, China, since 2013, and preliminary observations have shown that GR populations on the lower slopes of hills are more successful than those on the middle or upper slopes. To clarify the factors determining GR's invasion success, we compared GR population distributions among slope positions and the relationship between non-biotic factors and the invasion of GR. Of the soil physicochemical properties, only soil moisture differed significantly among slope positions, with the wettest soils found on the lower slopes. GR biomass increased with the soil water content, irrespective of native plant diversity. In our experiment, when the annual average soil volume moisture content exceeded 20.3% and 25.3%, GR could reduce the biomass of native herbs by more than 50% and 80%. Therefore, water is the determining factor of a successful GR invasion in the grasslands of the Yili Valley. On a global scale, it was discovered for the first time that GR can invade temperate grasslands, but also has risks of invading other grasslands that share similar conditions. So, GR invasions of temperate grasslands must be closely monitored, particularly in low-lying areas or those with increasing precipitation.

土壤水分是伊犁河谷草原豚草入侵的关键因素
巨型豚草(GR;三叶草(Ambrosia trifida L.)是一种外来入侵物种,对一些地区的草地生态系统和农田造成了严重的危害,但防治难度很大。自2013年以来,中国伊犁河谷丘陵草原的GR种群开始入侵,初步观察表明,GR种群在丘陵低坡上的繁殖成功率高于中坡和上坡。为了明确影响GR入侵成功的因素,我们比较了GR在不同坡位之间的种群分布以及非生物因素与GR入侵的关系。在土壤理化性质中,只有土壤水分在不同坡位之间存在显著差异,其中最湿的土壤位于较低的坡位。无论原生植物多样性如何,GR生物量随土壤含水量的增加而增加。在我们的试验中,当年平均土壤体积含水量超过20.3%和25.3%时,GR可使原生草本植物生物量减少50%和80%以上。因此,水是GR在伊犁河谷草原成功入侵的决定性因素。在全球范围内,首次发现GR可以入侵温带草原,但也有入侵其他具有相似条件的草原的风险。因此,必须密切监测温带草原的GR入侵,特别是在低洼地区或降水增加的地区。
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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来源期刊
Biology-Basel
Biology-Basel Biological Science-Biological Science
CiteScore
5.70
自引率
4.80%
发文量
1618
审稿时长
11 weeks
期刊介绍: Biology (ISSN 2079-7737) is an international, peer-reviewed, quick-refereeing open access journal of Biological Science published by MDPI online. It publishes reviews, research papers and communications in all areas of biology and at the interface of related disciplines. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced. Electronic files regarding the full details of the experimental procedure, if unable to be published in a normal way, can be deposited as supplementary material.
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