2025-03-12 中国科学院(CAS)
Overview of the experimental design (Image by WBG)
中国科学院武漢植物園の研究者たちは、外来植物の多様性が土壌の菌根菌(AMF)の増加を促し、特に十分な水分条件下でさらなる外来植物の侵入を助長する可能性があることを発見しました。しかし、この効果は干ばつなどの環境ストレス下では観察されず、環境要因が植物の侵入ダイナミクスにおいて重要な役割を果たすことが示唆されました。
<関連情報>
- https://english.cas.cn/newsroom/research_news/life/202503/t20250310_903412.shtml
- https://nph.onlinelibrary.wiley.com/doi/10.1111/nph.20462
外来種群集における多様性と侵入可能性の関係を媒介する土壌微生物遺産と干ばつ Soil microbial legacies and drought mediate diversity–invasibility relationships in non-native communities
Jiahui Yi, Zhibin Tao, Kaoping Zhang, Baoguo Nie, Evan Siemann, Wei Huang
New Phytologist Published: 09 February 2025
DOI:https://doi.org/10.1111/nph.20462
Summary
- High native species diversity generally suppresses non-native invasions, but many ecosystems are now characterized by non-native assemblages that vary in species diversity. How this non-native species diversity affects subsequent invaders and its environmental dependence remain unclear.
- We conducted a plant–soil feedback experiment. In the conditioning phase, we created three diversity levels (1, 2, or 4 species) using six non-native species to condition the soil. In the responding phase, we planted these six species individually with soil inocula and exposed them to two watering treatments (well-watered vs drought).
- Under well-watered conditions, the non-native biomass increased with soil inocula generated by different non-native diversity. This biomass pattern was mainly related to arbuscular mycorrhizal fungal richness which increased with non-native species diversity. However, under drought conditions, the non-native biomass did not depend on soil inocula generated by non-native diversity.
- Our results reveal the crucial role of soil microbial legacies in driving the positive diversity–invasibility relationships of non-native communities and drought stress can eliminate these positive relationships. These findings provide an explanation for the commonly observed co-occurrence of multiple non-native species in nature, predicting an accelerating accumulation of non-native species in a benign environment, but not in a stressed environment.
