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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引用次数: 0

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
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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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