Our newest paper from our common garden experiment testing whether plant-induced soil heterogeneity promotes plant species coexistence is out in the April issue of Oecologia. In this paper we show that soil heterogeneity increases per capita biomass of invaders (i.e. the disadvantaged species in a competing pair). By using a reciprocal invasion among species pairs in our experimental design, this indicates mutual invasibility by this species pair, which is a criterion for stable coexistence. Moreover, we unlock the “black box” of mechanistic drivers of plant-soil feedbacks by measuring the spatial arrangement in both biotic and abiotic soil properties within our experimentally-created soil treatments. We show that soil biota (bacteria and fungi) and phosphorous may be important drivers of the reproductive biomass response to the spatial arrangement of plant-soil feedbacks.
This paper wouldn’t have been possible without the outstanding work of Ph.D. student, Jennifer Murphy, and undergraduate student, Angela Kaczowka, along with many other students of the Burns lab who assisted with experimental set-up and data collection over the 4 years of the experiment.