Glyphosate remains in forest plant tissues for a decade or more

FOREST ECOLOGY AND MANAGEMENT

卷:493

Article

Botten, N.¹  Wood, L. J.²  Werner, J. R.^3,4 

[1] Univ Northern British Columbia, Nat Resource & Environm Studies, Prince George, BC, Canada

[2] Univ Northern British Columbia, Fac Environm, 3333 Univ Way, Prince George, BC V2N 4Z9, Canada

[3] British Columbia Minist Forests Lands & Nat Resou, Prince George, BC, Canada

[4] Univ Northern British Columbia, Ecosyst Sci & Management, Prince George, BC, Canada

关键词: Glyphosate;    Sub-lethal herbicide;    Persistence;    AMPA;    Forest ecology;   

DOI  :  10.1016/j.foreco.2021.119259

来源: Elsevier

【 摘 要 】

Glyphosate-based herbicides are highly effective, non-selective, and broad-spectrum herbicides that have been used in British Columbia's forest industry since the early 1980's. Over this time, long-term persistence of glyphosate has not been measured, largely due to the inability to analyze glyphosate at low concentrations. Given the advancements in analytical techniques that are now available, we have extended the persistence curve of glyphosate to elucidate the actual length of time of persistence in northern British Columbia, rather than relying on estimations of persistence based on half-life curves that are quite often modelled from incomparable environments. We collected plant tissues from five forest understory perennial species growing in two distinct biogeoclimatic regions of northern BC to map out how glyphosate residue quantities change over time according to species, plant tissue type, and climate regime. We found that residues persisted for up to 12 years in some tissue types, and that root tissues generally retained glyphosate residues longer than shoot tissue types. We also found that samples from the colder, more northern biogeoclimatic zone investigated retained significantly higher levels of glyphosate for longer than samples collected from the warmer biogeoclimatic zone.

【 授权许可】

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