Abstract
Background and aims
The ‘home-field advantage (HFA) hypothesis’ predicts a litter-field affinity effect on litter decomposition. In terrestrial ecosystems, plant roots have comprehensive roles in regulating litter-decomposer interactions, yet their potential influences on HFA remain unsolved. To fill this gap, we conducted a litter transplant experiment in a subtropical forest, and tested whether roots affect litter-field affinity via interactions with soil microbial functions.
Methods
Leaf litters of Quercus variabilis and Pinus massoniana were incubated at their conspecific-dominated and heterospecific-dominated forests. Root-specific incubation microcosms were manipulated by using a series of root ingrowth cores to control the access of living fine roots.
Results
Entire exclusion of roots led to a significant suppression of HFA, and the affinity effect was amplified under a medium root constraint treatment (by 0.5 mm mesh). Incubation field (‘home’ vs. ‘away’) generally had a positive effect on litter mineralization when roots were present, and roots became more influential after 9 months than 3 months of incubation. Although microbial enzymatic functions and their impact on litter N loss depended on root status, they were not associated with incubation field.
Conclusions
Our findings advocate that a moderate amount of local roots is essential for HFA in leaf litter decomposition, and taking account of root-mediated species-specific bio-interactions will advance our understanding of native litter- home field affinity.
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Acknowledgements
We thank Dr. Amanda Gallinat at the Boston University and Dr. Haijing Hu at the Nanjing University for their helpful comments, assistance with English language and grammatical editing of this manuscript. This study was financially supported by the National Key Research and Development Program of the Ministry of Science and Technology of China (No. 2016YFD0600204); the State Key Program of National Natural Science Foundation of China (No. 31530007); the Sanxin Forestry Project in Jiangsu Province (No. LYSX[2016]46); the specimen platform of China and the teaching specimens sub-platform (2005DKA21403-JK); and the Major Science and Technology Program for Water Pollution Control and Treatment (No. 2012ZX07204-004-003).
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Tian, K., Kong, X., Gao, J. et al. Local root status: a neglected bio-factor that regulates the home-field advantage of leaf litter decomposition. Plant Soil 431, 175–189 (2018). https://doi.org/10.1007/s11104-018-3757-8
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DOI: https://doi.org/10.1007/s11104-018-3757-8