Variable respiration rates of incubated permafrost soil extracts from the Kolyma River lowlands, north-east Siberia

Polar research

Joanne K. Heslop¹  Sudeep Chandra²  William V. Sobzcak³  Valentin V. Spektor⁴  Sergey P. Davydov⁵  Anna I. Davydova⁵  Katey M. Walter Anthony⁶ 

[1] Aquatic Ecosystems Analysis Laboratory, Department of Natural Resources and Environmental Science, University of Nevada, Reno, NV, USACorrespondence;Aquatic Ecosystems Analysis Laboratory, Department of Natural Resources and Environmental Science, University of Nevada, Reno, NV, USAView further author information;Department of Biology, College of the Holy Cross, Worcester, MA, USAView further author information;Melnikov Permafrost Institute Siberian Branch, Russian Academy of Sciences, Republic of Sakha (Yakutia), Yakutsk, Russian FederationView further author information;North-East Science Station, Pacific Institute of Geography, Far East Branch of Russian Academy of Sciences, Cherskiy, Russian FederationView further author information;Water and Environmental Research Center, University of Alaska Fairbanks, Fairbanks, AK, USAView further author information

关键词: Arctic;    carbon export and processing;    yedoma;    climate change;    greenhouse gas production;    BOD: biological oxygen demand;    DOC: dissolved organic carbon;    OC: organic carbon;    SE: standard error;    NH4-N: ammonium;    PO4-P: orthophosphate;   

DOI  :  10.1080/17518369.2017.1305157

学科分类：自然科学（综合）

来源: Co-Action Publishing

【 摘 要 】

ABSTRACTThawing permafrost supplies dissolved organic carbon (DOC) to aquatic systems; however, the magnitude, variability and fate of this DOC is not well constrained. Our objective was to examine DOC respiration from seasonally thawed and near-surface (<1.5 m) permafrost soils collected from five locations in the Kolyma River Basin, north-east Russia. We measured soil organic carbon (OC) content, water-soluble macronutrients (DOC, NH4, PO4) and the heterotrophic respiration potentials of soil extract DOC in five-day laboratory incubations. DOC concentrations ranged from 2.8 to 27.9 mg L−1 (n = 14). Carbon respiration was 0.03–0.47 mg C (n = 16) and 8.7–31.4%, total DOC (n = 14). While DOC concentration was a function of soil OC concentration, we did not find a relationship between C respiration and soil OC or DOC concentrations. Respiration was highest in the top active layer, but varied widely among sites, and lowest at the bottom of the active layer. Respiration from yedoma varied across sites (0.04–0...

【 授权许可】

CC BY-NC