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Differential priming effects induced by leaf- and root-litter in subtropical Chinese fir soil
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DOI：10.1007/s11104-026-08857-1.png)
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Abstract
En 中文
The priming effect (PE) is a key process regulating soil organic matter decomposition and carbon cycling in plant-soil systems. PE results from exogenous organic matter inputs and is modified by soil nutrient availability. Most studies examining nutrient effects on PE have used simple substrates (e.g., glucose or cellulose) under laboratory fertilization, leaving the responses of PE to natural litter inputs under field fertilization poorly understood. We conducted a 60-day laboratory incubation experiment to quantify PE following additions of four types of 13C-labelled leaf- and root-litter from Chinese fir (Cunninghamia lanceolata) and slash pine (Pinus elliottii). These two species are associated with arbuscular mycorrhizal (AM) and ectomycorrhizal (ECM) fungi, respectively. Litter additions were made in soil of a Chinese fir plantation experiencing different fertilization treatments (N, P, and NP) for nine years in Qianyanzhou, Jiangxi. Chinese fir (AM) litter generally induced negative PEs, whereas slash pine (ECM) litter induced positive PEs. Slash pine leaf-litter produced stronger PEs than root-litter, while Chinese fir litter showed no difference. Root-litter-induced PE responded to both fertilization treatments and litter origin, whereas leaf-litter-induced PE was mainly controlled by litter origin. Litter addition and its interaction with fertilization significantly affected soil fungal diversity but had little effect on bacterial diversity. PE was further mediated by fungal communities through adjustments in soil NH4+ concentration and fungal diversity. Our results underscore the importance of mycorrhizal associations, litter traits, and soil fungal communities in regulating litter-induced PE and associated soil carbon and nutrient cycling in subtropical plantations.
Keywords:
Fertilization treatments
Litter addition
Priming effect
AM and ECM trees
Subtropical plantation
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