Conclusion
In summary, we found that invasive plant species were larger and grew
faster than co-occurring native plant species over time in short-term.
Our results support a prediction of declining enemy release over time
that the effect of soil microbes on the growth of invasive plant species
changes from promotion to inhibition over time in short-term. Overall,
these results suggest that regardless of the direction and strength of
soil microbial feedback on invasive plant species, invasive plant
species consistently may grow larger than co-occurring native plant
species.