Fig 1.
(A) Map of China. (B) Map of Fujian Province. (C) Map of Dehua county. The blue pentagram is the sampling area.
Table 1.
Responses of physicochemical properties of soil at different depths to nitrogen addition in the Daiyun Mountain Nature Reserve in southeastern China.
Table 2.
Effects of nitrogen deposition, soil layer, and their interactions on soil bacterial (B) and fungal (F) α diversity analyzed by two-way ANOVA.
Fig 2.
Pearson’s correlation coefficients between soil properties and soil bacterial (A) and fungal (B) α-diversity.
α-diversity indices include Chao1, good coverage, observed species, PD whole tree, Shannon, and Simpson indices; SMC represents soil moisture content, CEC represents cation exchange capacity, SOC represents soil organic carbon, TN represents total nitrogen, TP represents total phosphorus, CN ratio represents the carbon:nitrogen ratio, and DOC represents dissolved organic carbon.
Fig 3.
Relative abundance of dominant phyla of bacteria and fungi in the topsoil and subsoil under different N addition treatments.
Control treatment in topsoil is represented by CT_A, low nitrogen addition in topsoil is represented by LN_A, high nitrogen addition in topsoil is represented by HN_A; control treatment in subsoil is represented by CT_B, low nitrogen addition in subsoil is represented by LN_B, and high nitrogen addition in subsoil is represented by HN_B.
Fig 4.
Redundancy discriminate analysis (RDA) plots illustrating the relationships between the dominant bacterial (A) and fungal (B) phyla and soil physicochemical properties and microbial biomass.
Table 3.
Mantel test analysis of soil physicochemical properties and soil microbial biomass and community composition in topsoil and subsoil under different nitrogen addition treatments.