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.

基于草甘膦的除草剂是高效，非选择性和广谱的除草剂，自1980年代初以来已在不列颠哥伦比亚省的森林工业中使用。在这段时间内，尚未测量草甘膦的长期残留，这在很大程度上是由于无法分析低浓度的草甘膦。鉴于现在可用的分析技术的进步，我们扩展了草甘膦的持久性曲线以阐明不列颠哥伦比亚省北部的持久性的实际时间长度，而不是依赖于基于半衰期曲线的持久性估计，该半衰期曲线通常是从无与伦比的环境中建模。我们从生长在不列颠哥伦比亚省北部两个不同生物地理气候区的五种森林林下多年生物种收集了植物组织，以绘制出草甘膦残留量如何随物种，植物组织类型和气候状况而随时间变化的图。我们发现某些组织类型中的残留物可持续长达12年，并且根部组织通常保留草甘膦残留物的时间比苗条类型更长。我们还发现，与从较温暖的生物地理气候带采集的样品相比，来自较冷，更北部的生物地理气候带的样品保留的草甘膦含量明显更高，且保留时间更长。根组织通常保留草甘膦残留的时间要长于芽组织类型。我们还发现，与从较温暖的生物地理气候带采集的样品相比，来自较冷，更北部的生物地理气候带的样品保留的草甘膦含量明显更高，且保留时间更长。根组织通常保留草甘膦残留的时间要长于芽组织类型。我们还发现，与从较温暖的生物地理气候带采集的样品相比，来自较冷，更北部的生物地理气候带的样品保留的草甘膦含量明显更高，且保留时间更长。