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Simulated leaf litter addition causes opposite priming effects on natural forest and plantation soils

  • Maokui Lyu
  • Jinsheng Xie
  • Matthew A. Vadeboncoeur
  • Minhuang Wang
  • Xi Qiu
  • Yinbang Ren
  • Miaohua Jiang
  • Yusheng Yang
  • Yakov Kuzyakov
Original Paper

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.

Keywords

Microbial community composition Priming effects Selective decomposition Subtropical forest soils Land-use effects 

Notes

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.”

Supplementary material

374_2018_1314_MOESM1_ESM.docx (980 kb)
ESM 1 (DOCX 979 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Key Laboratory for Subtropical Mountain Ecology (Ministry of Science and Technology and Fujian Province Funded), College of Geographical ScienceFujian Normal UniversityFuzhouChina
  2. 2.Institute of Geography SciencesFujian Normal UniversityFuzhouChina
  3. 3.Earth Systems Research CenterUniversity of New HampshireDurhamUSA
  4. 4.Department of GeographyMinjiang UniversityFuzhouChina
  5. 5.Institute of Environmental SciencesKazan Federal UniversityKazanRussia
  6. 6.Soil Science ConsultingGöttingenGermany
  7. 7.Agro-Technology InstituteRUDN UniversityMoscowRussia

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