Abstract
Aims
Chemical defence in plant tissue is an important physiological process in plants, mainly driven by secondary metabolites. However, how the chemical defence substances regulate soil biological processes after tissue death is still unclear.
Methods
Litter bags filled with cotton strips and wood sticks were placed on the forest floor, combined soil zymography and high-throughput sequencing methods, we studied the effect of chemical defence substances of Cinnamomum camphora on the decomposition of the standard litter incubated in C. camphora forest and Quercus variabilis forest. In laboratory trials, we tested how microorganisms responded to these chemical defence substances using selective media.
Results
The addition of C. camphora chemical defence substances increased the decomposition rate of standard litter in situ environment by more than 70%; While in the away ecosystem, Q. variabilis forest, reduced the decomposition rate of standard litter by approximately 50%. The soil P content and activity of acid phosphatase changed significantly. Adding C. camphora components to the C. camphora forest significantly enhanced the abundance of detritivores, the opposite result is observed in Q. variabilis forest. Evidence suggests that C. camphora components regulated soil microbial communities.
Conclusions
Our study suggests a legacy effect associated with plant chemical defence substances, which regulates the soil nutrient cycle such as litter decomposition and plays a positive or negative role in soil carbon dynamics depending on the presence of co-evolved or naïve decomposers. The study of this universal ecological legacy effect provides an important theoretical reference for soil utilization and planting of plantations.
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Acknowledgements
Sincere thanks to the National Natural Science Foundation of China (31870598), Jiangsu Forestry Science and technology innovation and promotion project (LYKJ[2021]16), Strategic Priority Research Program of the Chinese Academy of Sciences (A) (XDA19050400), Postgraduate Research & Practice Innovation Program of Jiangsu Province (KYCX22_0128) and the program B for Outstanding PhD candidate of Nanjing University (202201B049 and 202201B051) for financially supporting the study. We thank Run Liu and Yunru Chen for their guidance in the experiment, Hongjun Liu and Yigui Zhang for their field help, and Xiao-Fen Li for data collection. Special thanks are extended to Dr. Björn Berg for his critical reading and comments on revising the manuscript.
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Y.L. conceived of the study. Y.L. and X.T. designed the study. Y.L., L.W., F.L., S.L. and Z.Z. conducted the field experiments. Y.L., W.H., S.L. and F.L. conducted the lab experiments. Y.L. and L.W. analysed the results. Tinging C. provided guidance for the experiment. Tong C. drew the figures. Y.L. wrote the manuscript. Tinging C., L.W., W.H. and X.T. edited the manuscript. All authors approved the final version.
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Luo, Y., Wang, L., Cao, T. et al. Legacy effect of plant chemical defence substances on litter decomposition. Plant Soil 487, 93–108 (2023). https://doi.org/10.1007/s11104-023-05954-3
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DOI: https://doi.org/10.1007/s11104-023-05954-3