Waterlogging may reduce chemical soil C stabilization in forested peatlands

泥炭 内涝(考古学) 表土 根际 生物量(生态学) 环境科学 土壤碳 底土 农学 化学 土壤pH值 北方的 土壤水分 大块土 土壤有机质 土壤科学 生态学 生物 湿地 遗传学 细菌
作者
Jouni Kilpeläinen,Krista Peltoniemi,Paavo Ojanen,Päivi Mäkiranta,Sylwia Adamczyk,Timo Domisch,Raija Laiho,Bartosz Adamczyk
出处
期刊:Soil Biology & Biochemistry [Elsevier BV]
卷期号:187: 109229-109229
标识
DOI:10.1016/j.soilbio.2023.109229
摘要

Boreal forested peatlands are globally significant carbon (C) pools where soil water-table level largely controls decomposition rate. Here we aimed to investigate the contrarian hypothesis that waterlogging conditions do not lead to increased C stabilization in a forested peatland. We studied how waterlogging affects root and soil chemistry, fungal biomass and necromass, C pools, soil enzyme activities and fungal community composition in Pinus sylvestris rhizosphere. Samples were collected from 0 to 10 cm, 10–20 cm and 20–30 cm soil layers in a controlled-environment experiment with waterlogging and control treatments and in two forested peatland sites, wetter and drier. Tannin content, live fungal biomass, enzyme activities, and chemically stable SOC content and its proportion of total SOC content were generally lower in waterlogged than control treatment in the experiment, and lower in the wetter than the drier site. The proportion of ectomycorrhizal fungi was higher in the drier than the wetter site in the deepest soil layer studied, 20–30 cm. In the wetter site, chemically stable SOC content and proportion of ericoid mycorrhizal fungi were highest in topsoil that contained more roots than deeper soil layers. In conclusion, forested peatlands possess specific root-related chemical SOC stabilization mechanisms, and, consequently, waterlogging makes their SOC more vulnerable due to decreased chemical C stabilization via root-microbial interactions and lowering root production.
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