Root effects on soil carbon and nitrogen cycling in a Pinus radiata D. Don plantation on a coastal sand

辐射松 垃圾箱 土壤水分 硝化作用 自行车 土壤呼吸 环境科学 土壤碳 农学 氮气 氮气循环 辐射 森林地面 土壤有机质 孵化 化学 植物 土壤科学 生物 林业 有机化学 地理 生物化学 维格纳
作者
Des J. Ross,Neal A. Scott,K. R. Tate,N. J. Rodda,Jackie A. Townsend
出处
期刊:Soil Research [CSIRO Publishing]
卷期号:39 (5): 1027-1027 被引量:43
标识
DOI:10.1071/sr00058
摘要

Although the contribution of roots to soil carbon (C) fluxes and biochemical processes is recognised, it is difficult to quantify. One approach to assess their importance is the use of trenched plots, in which C inputs to the soil and respiration by living roots has ceased. We give here an account of C and nitrogen (N) pools and mineralisation in samples taken 27 months after trenching in a 26-year-old Pinus radiata D. Don plantation on a coastal sand (an Aquic Udipsamment); above-ground litter inputs continued throughout the 27-month period.Moisture contents were higher in FH material and mineral soil from the trenched than from the control plots. Trenching had no effect on total organic C and N concentrations, but led to decreases in extractable C, microbial C and N, and CO2-C production values at some depths in the soil profile. Mineral-N concentrations and gross nitrification rates were, in contrast, initially higher in the trenched-plot samples, but were similar in both treatments after incubation of the samples at 25°C for 57 days. Mineral-N concentrations were also higher in the trenched than control mineral soil after in situ incubation. On an area basis (to 20 cm depth of mineral soil), inputs from roots were estimated to account for about 40% of the extractable C pool, 28% of microbial C, 26% of microbial N, and 23% of heterotrophic CO2-C production (0–7 days at 25°C) in the control soil. Overall, our results suggest a tight connection between N cycling rates and the labile C pools derived from below-ground inputs, with nitrification in particular increasing as C availability declined as a result of trenching.
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