Composition of the Water-Soluble Soil Fraction on the Barents Sea Coast: Organic Carbon and Nitrogen, Low-Molecular Weight Components

被引:9
|
作者
Shamrikova, E., V [1 ]
Kubik, O. S. [1 ]
Deneva, S., V [1 ]
Punegov, V. V. [1 ]
机构
[1] Russian Acad Sci, Ural Branch, Inst Biol, Komi Sci Ctr, Syktyvkar 167982, Russia
关键词
water extracts of soil; carbon and nitrogen organic compounds; acids; alcohols; carbohydrates; soils of arctic coasts; the Khaipudyr Bay; subarctic and halophytic vegetation; ARCTIC SOILS; TUNDRA VEGETATION; SURFACE HORIZONS; MARSH SOILS; SALT-MARSH; MATTER; PERMAFROST; DECOMPOSITION; CHEMISTRY; QUALITY;
D O I
10.1134/S1064229319110103
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
Water extracts from soils of the Barents Sea coast (the Khaipudyr Bay) were analyzed for the contents of organic carbon and total nitrogen by the method of high-temperature catalytic oxidation with non-dispersive IR registration; the contents of low-molecular-weight acids, carbohydrates, and alcohols were determined by gas chromatography and gas chromatography-mass-spectrometry. The mass fraction of inorganic carbon (HCO3-) was measured potentiometrically, and the content of inorganic nitrogen (N-NO3-, N-NH4+) was determined by photometry. In marsh soils (Tidalic Fluvisols (Arenic or Loamic, Epiprotosalic)), omega(C-org)(H2O) = 0.1-0.8, omega(N-org)(H2O) = 0.01-0.05 g/kg, omega(N-org)(H2O) = 0.06 omega(C-org)(H2O) + 0.01, and (C/N)(H2O) = 7-21. The content of individual components does not exceed 20 mg/kg, including carbohydrates (50-90%), acids (10-50%), and alcohols (<3%). In peat horizons of tundra soils (Cryic Histosols and Histic Cryosols), omega(C-org)(H2O) = 4-10, omega(N-org)(H2O) similar to and (C/N)(H2O) = 25-56. Litter and peat horizons accumulate both individual humus components and total dissolved organic carbon. The total weight of the identified substances is 200300 mg/kg, 80-90% of them are carbohydrates, 10-20% are acids, and 0-9% are alcohols. The accumulation of (C-org)(H2O) and (N-NH4+)(H2O) takes place above the permafrost table. It is argued that the ratios of organic forms of carbon and nitrogen in soil water extracts and the content of low-molecular weight organic compounds in soils can be used as indicators of pedogenic processes in the Far North.
引用
收藏
页码:1347 / 1362
页数:16
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