Conditional responses of the abundance of native and non-native plants to processes controlling community dominance remain little explored. Here, we studied how the environmental context alters relative abundances of those species in communities growing after disturbance. We addressed that question by conducting field sampling, where we seasonally estimated species cover and soil moisture in dunes and non-dune environments subjected to plowing, a common disturbance in our study site, the Argentinean Caldenal. We also measured texture, nutrients, and pH in dune and non-dune soils. We found that natives consistently dominated communities in dunes. In non-dunes, non-natives dominated communities soon after disturbance, but exhibited lower abundance than natives toward the end of the growing season, resulting in no differences between biogeographical origins when seasonal samplings were combined within the year. Panicum urvilleanum, a native grass, quickly dominated communities in dunes, but it was virtually absent in non-dunes. In addition, soils were coarser and lower in resources and pH in dunes than non-dunes. Our results suggest that native versus non-native dominance after disturbance varies with the environment. Moreover, the strong community dominance displayed by natives after plowing in dunes questions the common perspective that considers human disturbance as favoring non-native over native species.

本地和非本地植物的丰度对控制群落优势的过程的条件反应仍然很少被探索。在这里，我们研究了环境背景如何改变干扰后生长的群落中这些物种的相对丰度。我们通过进行实地采样来解决这个问题，我们按季节估算沙丘和非沙丘环境中遭受犁耕的物种覆盖度和土壤湿度，犁耕是我们研究地点阿根廷卡尔德纳尔的常见干扰。我们还测量了沙丘和非沙丘土壤的质地、养分和 pH 值。我们发现当地人一直主导着沙丘社区。在非沙丘中，非本地物种在受到干扰后不久就占据了群落的主导地位，但在生长季节结束时表现出的丰度低于本地物种，因此当一年内合并季节性采样时，生物地理起源之间没有差异。黍（Panicum urvilleanum）是一种本土草，很快在沙丘群落中占据主导地位，但在非沙丘中几乎不存在。此外，沙丘土壤比非沙丘土壤更粗糙，资源和 pH 值更低。我们的结果表明，干扰后本地与非本地的优势随环境而变化。此外，当地人在沙丘耕作后所表现出的强大群落优势对认为人类干扰比本地物种更有利的普遍观点提出了质疑。