Disturbance alters transience but nutrients determine equilibria during grassland succession with multiple global change drivers
Disturbance alters transience but nutrients determine equilibria during grassland succession with multiple global change drivers
复制标题
DOI：
10.1111/ele.14229
复制
发表时间：
2023-05-01
期刊：
影响因子：
8.8
通讯作者：
Shoemaker, Lauren G.
中科院分区：
文献类型：
--
作者：
DeSiervo, Melissa H.;Sullivan, Lauren L.;Shoemaker, Lauren G.
干扰和环境变化可能导致群落向稳定状态收敛，向多个可选状态分化，或保持长期的短暂性。然而，对演替轨迹的实证研究很少，特别是在同时经历多个人为变化驱动因素的系统中。利用长期（22年）试验数据，研究了干扰和氮肥作用下原野草地群落的演替。无论最初的干扰如何，十年后群落在很大程度上由资源可用性决定的稳定状态下收敛，其中物种更替随着群落接近动态平衡而下降。受干扰影响的物种是那些最终在高肥力地块上占据主导地位的物种。此外，干扰使演替途径更加直接，揭示了养分与干扰之间的重要交互作用是群落变化的驱动因素。我们的研究结果强调了草地和老田演替的动态性质，展示了群落特性（如beta $$ \beta $$多样性）如何通过瞬态和平衡状态变化。
Disturbance and environmental change may cause communities to converge on a steady state, diverge towards multiple alternative states or remain in long-term transience. Yet, empirical investigations of successional trajectories are rare, especially in systems experiencing multiple concurrent anthropogenic drivers of change. We examined succession in old field grassland communities subjected to disturbance and nitrogen fertilization using data from a long-term (22-year) experiment. Regardless of initial disturbance, after a decade communities converged on steady states largely determined by resource availability, where species turnover declined as communities approached dynamic equilibria. Species favoured by the disturbance were those that eventually came to dominate the highly fertilized plots. Furthermore, disturbance made successional pathways more direct revealing an important interaction effect between nutrients and disturbance as drivers of community change. Our results underscore the dynamical nature of grassland and old field succession, demonstrating how community properties such as beta$$ \beta $$ diversity change through transient and equilibrium states.