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Differential responses of fine root biomass to nitrogen deposition mediated by functional diversity
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DOI：10.3389/fpls.2026.1884380.png)
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Abstract
En 中文
IntroductionFine root functional diversity can help explain and predict ecosystem functioning by integrating multiple fine root traits. However; because different functional diversity metrics emphasize distinct aspects of trait variation; their explanatory and predictive power may vary. Under ongoing atmospheric nitrogen (N) deposition; the responses of fine root functional diversity to N inputs and its contribution to community-level fine root biomass remain insufficiently understood.MethodsWe conducted coordinated field experiments in warm-temperate and subtropical forests; applying three N addition levels (0; 25; and 50 kg ha-1 yr-1) and two N addition ways (canopy addition N; CAN; and understory addition N; UAN). During both the growing and non-growing seasons; we quantified community-level fine root biomass and evaluated the relative contributions of the community-weighted mean (CWM) and functional diversity (FD) of dominant species to biomass variation.ResultsOur results showed that N addition increased community-level fine root biomass in the warm-temperate forest during the growing season; whereas no clear pattern emerged in the non-growing season; by contrast; fine root biomass in the subtropical forest decreased in both seasons. In both forest types; fine root biomass during the growing season was primarily explained by CWM; supporting the mass-ratio hypothesis; whereas biomass patterns in the non-growing season were better explained by FD; consistent with the niche complementarity hypothesis.DiscussionThese findings highlight the pivotal role of climatic differences in mediating the effects of N addition on fine root biomass and trait expression; providing empirical evidence for understanding the applicability of the mass-ratio and niche complementarity hypotheses to belowground forest responses to N deposition.
Keywords:
functional diversity
nitrogen addition
niche complementarity
community-weighted mean
fine root biomass
mass-ratio hypothesis
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