Nontarget Plant Community and Biomass Responses in Northern Mixed Grassland Treated With Indaziflam for Invasive Annual Brome Control

IF 2 3区 环境科学与生态学 Q3 ECOLOGY
Anabel Dombro, Lisa Raatz, Edward W. Bork
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Abstract

Aims

To understand how northern temperate grassland vegetation responds to indaziflam herbicide treatment used to control invasive annual bromegrass, we studied the initial and longer-term effects of indaziflam on plant species composition, richness, diversity, and biomass. We additionally assessed the influence of indaziflam on the recruitment of perennial grasses and forbs from the seedbank, and root and shoot biomass of young perennial grass plants.

Location

Dry Mixed Grassland of Alberta, Canada.

Methods

Plant biomass and cover composition were monitored over 4 years after indaziflam application in fall and spring at concentrations of 0, 37.5, 75, and 150 g ai ha−1 across two field sites, with four replication blocks for each concentration. Seedling emergence was assessed in the greenhouse using soil cores from fall plots two seasons after treatment. Root and shoot biomass of greenhouse-cultivated perennial grasses treated with indaziflam at 2 months age were quantified 2 months later.

Results

Indaziflam did not affect the cover, richness, or diversity of non-brome plant species until the fourth year after treatment. In the fourth year, indaziflam reduced plant richness and diversity and affected the cover of the three most abundant grasses but not the cover of the three most abundant forbs. Total shoot biomass decreased in the second year, increased in the third, and stabilized by the fourth year following indaziflam treatment. Perennial grass biomass either increased or remained the same but did not decline under any indaziflam treatment in any year. Forb biomass was not affected. In the greenhouse, indaziflam-treated soil had reduced seedling emergence of forbs but not perennial grasses, and indaziflam applied at 2 months of age reduced root and shoot biomass of four-month-old perennial grasses.

Conclusions

Our study provides an improved understanding of how indaziflam affects nontarget plant community composition and biomass within northern mixed grasslands where native vegetation is relatively intact but under increasing risk of invasion by annual bromegrasses. Land managers considering indaziflam application will have to weigh small reductions in diversity and subtle changes in perennial grass composition against the beneficial control of annual brome.

Abstract Image

使用吲唑草胺(Indaziflam)控制入侵性一年生锦鸡儿的北方混合草地的非目标植物群落和生物量反应
为了解北温带草地植被对吲达西弗拉姆除草剂防治一年生溴甲烷入侵的响应,研究了吲达西弗拉姆对北温带草地植物物种组成、丰富度、多样性和生物量的初步和长期影响。此外,我们还评估了indaziflam对多年生草本植物和草本植物从种子库中招募的影响,以及多年生草本植物的根和茎生物量。地理位置:加拿大亚伯达省干燥的混合草地。方法在秋季和春季分别以0、37.5、75和150 g / ha - 1的浓度在两个试验点上施用吲唑氟4年,对不同浓度的植物生物量和覆被组成进行监测。利用处理后两季的秋田土芯,在温室内评价幼苗出苗情况。在2月龄时,对温室栽培多年生牧草的根和地上部生物量进行定量分析。结果Indaziflam对非溴系植物的盖度、丰富度和多样性没有影响,直到处理后第4年。第4年,茚唑氟降低了植物的丰富度和多样性,影响了3种最丰富的禾本科植物的覆盖,但对3种最丰富的草本植物的覆盖没有影响。茚地氟仑处理后第二年总茎部生物量下降,第三年增加,第四年趋于稳定。在任何年份,茚地夫拉姆处理的多年生草生物量均增加或保持不变而不下降。牧草生物量不受影响。在温室中,施用吲哚噻虫啉的土壤减少了草本植物出苗,但没有减少多年生草本植物出苗,2月龄施用吲哚噻虫啉减少了4月龄多年生草本植物的根和梢生物量。结论indaziflam对北方混交草地非目标植物群落组成和生物量的影响,在北方混交草地,原生植被相对完整,但一年生溴生草入侵风险增加。考虑使用indaziflam的土地管理者将不得不权衡多样性的微小减少和多年生草组成的微妙变化与一年生雀稗的有益控制。
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来源期刊
Applied Vegetation Science
Applied Vegetation Science 环境科学-林学
CiteScore
6.00
自引率
10.70%
发文量
67
审稿时长
3 months
期刊介绍: Applied Vegetation Science focuses on community-level topics relevant to human interaction with vegetation, including global change, nature conservation, nature management, restoration of plant communities and of natural habitats, and the planning of semi-natural and urban landscapes. Vegetation survey, modelling and remote-sensing applications are welcome. Papers on vegetation science which do not fit to this scope (do not have an applied aspect and are not vegetation survey) should be directed to our associate journal, the Journal of Vegetation Science. Both journals publish papers on the ecology of a single species only if it plays a key role in structuring plant communities.
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