Invasive scotch broom alters soil chemical properties in Douglas-fir forests of the Pacific Northwest, USA

摘要: Scotch broom is an N-fixing invasive species that has high potential to alter soil properties. We compared from areas of invasion with nearby had no evidence assess the influence on P fractions and other chemical The study was conducted at two contrasting Douglas-fir sites in Oregon (OR) Washington (WA), USA for 10 years. used Hedley sequential fractionation procedure effects pools varying bioavailability, also measured total C, N extractable nutrient cations. Total C were significantly higher present fine-textured OR site, but there effect coarse-textured WA site. There difference labile-P measures between presence absence either notable reductions (25–30 %) intermediately-available fraction when present. Extractable cations (notably K) lower both sites, most pronounced Lasting are likely be associated variable changes N, decreases nutrients available P. These changes, documented soil, have lasting growth after removal will vary depending status a given