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- W2905841207 abstract "Plantation development stage (forest age sequence) influences environmental conditions and litter inputs, which can modify labile C and N pools. Changes in labile C and N pools during stand development could vary considerably with soil parent material. However, empirical evidence is scarce regarding the extent of interactive effects between parent material and stand development stage on labile C and N pools in plantations of Chinese fir (Cunninghamia lanceolata (Lamb.) Hook.), the dominant plantation tree in southern China. We examined the concentrations of soil labile C and N (dissolved organic carbon, DOC, dissolved organic nitrogen, DON, dissolved inorganic nitrogen, DIN, microbial biomass carbon, Cmic, microbial biomass nitrogen, Nmic) and basic soil properties within a soil depth of 100 cm for three stand development stages (young, middle-aged and mature) of Chinese fir plantations grown on soils derived from granite or siltstone. The parent material influenced the responses of the DON, DIN and Nmic pools to stand development stage, whereas no interaction effect of parent material and stand on the Cmic and DOC pools was observed. The parent material had a clear effect on the standing pools of labile C and N. Siltstone soils tended to have greater pool sizes of DOC, DON, DIN, and Nmic and greater ratios of Cmic/total carbon (TC) and Nmic/total nitrogen (TN). The stand development stage did not affect the DOC, Cmic and Cmic/TC ratio. The mineral N and Nmic pools increased significantly and the DON and DON/TN ratio declined sharply from young to middle-aged stands in both soil type. The changes in the DON, DIN and Nmic pools and the Nmic/TN ratio from middle-aged to mature stands depend on the parent material. The concentrations of DOC, DON, DIN, Cmic and Nmic were positively correlated with multiple soil parameters, such as the TC, TN, C/N ratio, water-stable aggregates (WSA), and water content, but negatively correlated with the bulk density (BD). DOC, DON, Cmic and Nmic significantly decreased with soil depth, but the extent of the decrease in DOC and DON was greater in course-textured granite soils. Overall, the turnover rates of the labile C pools are higher in the siltstone soils where internal N cycling during a traditional rotation ~25 years maintain the supply of mineral N and improve N incorporation into microbial biomass. These results highlight the need to identify soil physicochemical properties before afforestation. The rotation length and N fertilizer application in Chinese fir plantations should be adjusted based on the soil parent material." @default.
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- W2905841207 date "2019-03-01" @default.
- W2905841207 modified "2023-10-16" @default.
- W2905841207 title "Soil parent material and stand development stage effects on labile soil C and N pools in Chinese fir plantations" @default.
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- W2905841207 doi "https://doi.org/10.1016/j.geoderma.2018.11.050" @default.
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