Dudenhöffer Jan-Hendrik, Hulme Phillip E
Department of Pest-Management and Conservation, Lincoln University, Lincoln, 7647, Canterbury, New Zealand.
New Phytol. 2025 Aug;247(4):1887-1896. doi: 10.1111/nph.70282. Epub 2025 May 30.
Plant-soil feedback (PSF) is a standing concept helping to explain plant species coexistence. Accumulating evidence suggests that PSF depends on the environmental context. One particularly impactful disruption of the environmental context is the invasion of alien species into a community. While PSF between native and non-native species has been linked to invasion success, the effect of an invader on PSF between resident plants has received little attention. We explored how Pinus contorta (lodgepole pine) invasion impacts PSF between four resident grasses (two native and two non-native species). We grew the plants in live soil to condition species-specific soil communities, followed by a response phase where the plants were grown in conspecific and heterospecific soil. Both phases were performed with soil from uninvaded, invaded, or controlled invasion areas. Pairwise PSF between the species in uninvaded soil was negative and became neutral to positive in invaded soil. This effect persisted even after P. contorta removal. Our results suggest a destabilizing effect of P. contorta invasion on the coexistence of the resident grasses, benefitting non-natives over natives. This work exemplifies an overlooked mechanism by which an invader can alter interactions between resident species and adds a novel dimension to the context dependence of PSF.
植物 - 土壤反馈（PSF）是一个有助于解释植物物种共存的长期概念。越来越多的证据表明，PSF取决于环境背景。环境背景中一种特别有影响力的干扰是外来物种入侵群落。虽然本地物种与非本地物种之间的PSF与入侵成功有关，但入侵者对本地植物之间PSF的影响却很少受到关注。我们探究了扭叶松（黑松）入侵如何影响四种本地草本植物（两种本地物种和两种非本地物种）之间的PSF。我们将植物种植在活土中以形成物种特异性的土壤群落，随后进入响应阶段，在此阶段植物在同种和异种土壤中生长。两个阶段均使用来自未入侵、已入侵或控制入侵区域的土壤进行。未入侵土壤中物种之间的成对PSF为负，而在已入侵土壤中变为中性至正。即使在去除扭叶松后，这种效应仍然存在。我们的结果表明，扭叶松入侵对本地草本植物的共存具有破坏稳定的作用，使非本地物种比本地物种受益更多。这项工作例证了一种被忽视的机制，入侵者可以通过这种机制改变本地物种之间的相互作用，并为PSF的背景依赖性增添了一个新的维度。
