AUTHOR=Ying Liu , Yanfeng Wang , Wenzhou Wu , Zhi Ding , Maohua Ma , Ping Huang , Shengjun Wu , Yanjing Lou 

TITLE=Plant–plant interactions vary greatly along a flooding gradient in a dam-induced riparian habitat

JOURNAL=Frontiers in Plant Science

VOLUME=14

YEAR=2023

URL=https://www.frontiersin.org/journals/plant-science/articles/10.3389/fpls.2023.1290776

DOI=10.3389/fpls.2023.1290776

ISSN=1664-462X

ABSTRACT=<p>Plant–plant interactions under extreme environmental stress are still controversial. The stress gradient hypothesis (SGH) proposes that facilitation prevails under extreme environmental stresses, while an alternative view states that facilitation collapses or even switches back to competition at the extreme end of stress gradients. However, how the relationship between plant–plant interaction and periodic extreme flooding stress varies and its underlying mechanism are still unclear in a dam-regulated riparian ecosystem. We established a controlled experiment using two dominant species pairs (<italic>Cynodon dactylon</italic>–<italic>Cyperus rotundus</italic> and <italic>C. dactylon</italic>–<italic>Xanthium sibiricum</italic>) in the water level fluctuating zone of the Three Gorges Dam to examine their growth responses to the periodic extreme flooding stress. The results showed that as flooding stress increased, the competitive effect of <italic>C. dactylon</italic> on <italic>X. sibiricum</italic> shifted to facilitation, whereas the effect of <italic>X. sibiricum</italic> on <italic>C. dactylon</italic> maintained a strong inhibition. The plant height of <italic>X. sibiricum</italic> was the most important driver of the interaction between <italic>X. sibiricum</italic> and <italic>C. dactylon</italic> along the flooding gradient. The net effect of <italic>C. dactylon</italic> on <italic>C. rotundus</italic> shifted from neutral to negative, and the inhibitory effect of <italic>C. rotundus</italic> on <italic>C. dactylon</italic> became stronger at the extreme end of flooding stress. The root biomass of the two species was the key trait regulating their interaction with increasing flooding stress. Overall, the SGH was partially supported along our periodic extreme flooding stress gradient. Aboveground resource (light) might be the dominant factor driving the response of the interaction between annual plants and perennial clonal plants to periodic flooding stress, whereas belowground resource (water and nutrients) was probably the dominant factor for perennial clonal plants. Our study will help to further understand the environmental responses of plant–plant relationships and their regulatory mechanism, and the succession of riparian plant communities under extreme environmental changes, providing a basic theoretical basis and data support for the ecological restoration and management of riparian wetland vegetation.</p>