Abstract
The conversion of natural forests to tree plantations alters the quality and decreases the quantity of litter inputs into the soil, but how the alteration of litter inputs affect soil organic matter (SOM) decomposition remain unclear. We examined SOM decomposition by adding 13C-labeled leaf-litter of Chinese fir (Cunninghamia lanceolata (Lamb.) Hook) to soils from a natural evergreen broad-leaved forest and an adjacent Chinese fir plantation converted from a natural evergreen broad-leaved forest 42 years ago. Over 195 days, we monitored CO2 efflux and its δ13C, microbial biomass, and the composition of microbial groups by phospholipid fatty acids (PLFAs). To distinguish priming mechanisms, partitioning of C sources in CO2 and microbial biomass was determined based on δ13C. Leaf-litter addition to natural forest increased microbial biomass and induced up to 14% faster SOM decomposition (positive priming) than that in soil without litter. In contrast, negative priming in soils under plantation indicated preferential use of added leaf-litter rather than recalcitrant SOM. This preferential use of leaf-litter was supported by an increased fungal to bacterial ratio and litter-derived (13C) microbial biomass, reflecting increased substrate recalcitrance, the respective changes in microbial substrate utilization and increased C use efficiency. The magnitude and direction of priming effects depend on microbial preferential utilization of new litter or SOM. Concluding, the impact of coniferous leaf-litter inputs on the SOM priming is divergent in natural evergreen broad-leaved forests and plantations, an important consideration in understanding long-term C dynamics and cycling in natural and plantation forest ecosystems.
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13 October 2018
The author regret that a typographical error was present in the Fig. 2 of the published original version of this article; the text “Natual” in the image should have been “Natural”. The correct Fig. 2 is now presented correctly in this article.
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Acknowledgements
We thank Soil Science Consulting (https://soilscicon.wordpress.com) for help in the preparation of the manuscript.
Funding
The research was funded by the National Key Research and Development Program (No. 2016YFD0600204), the National Natural Science Foundation of China (Nos. U1405231, U1505233, and 31470501), and the National “973” Program of China (No. 2014CB954003). The publication was supported by the Government Program of Competitive Growth of Kazan Federal University and with the support of the “RUDN University program 5-100.”
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Lyu, M., Xie, J., Vadeboncoeur, M.A. et al. Simulated leaf litter addition causes opposite priming effects on natural forest and plantation soils. Biol Fertil Soils 54, 925–934 (2018). https://doi.org/10.1007/s00374-018-1314-5
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DOI: https://doi.org/10.1007/s00374-018-1314-5