Effect of the storage conditions of soil samples on carbon and nitrogen extractability
- Authors: Makarov M.I.1, Kuznetsova E.Y.1, Malysheva T.I.1, Maslov M.N.1, Menyailo O.V.2
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Affiliations:
- Lomonosov Moscow State University
- Sukachev Institute of Forest Research
- Issue: Vol 50, No 5 (2017)
- Pages: 549-558
- Section: Soil Chemistry
- URL: https://journals.rcsi.science/1064-2293/article/view/223993
- DOI: https://doi.org/10.1134/S1064229317030085
- ID: 223993
Cite item
Abstract
Concentrations of carbon and nitrogen extractable by 0.05 M K2SO4 (Cext and Next, respectively) in 14 soils of different ecosystems vary from 16 to 205 and from 4 to 53 mg/kg, respectively. The portion of Cext in soil organic matter is 0.06 to 0.38% of total carbon, and the portion of Next is 0.12–1.05% of total nitrogen. The storage of samples and their preparation to analysis differently affect the extractability of elements. The concentration of Cext is less variable than the concentration of Next. An increase in C extractability (by 1.4–6.7 times) is a common feature of all soils under drying; at the following incubation of dried soils, the extractability of C decreases by 28–56%. The extractability of N increases not only under drying (by 1.5–7.1 times) and the following incubation of samples (by 25–60% to 2–3 times), but also under freezing of most soils and at the incubation of fresh and defrozen samples. A close direct correlation is observed between the initial water content of soil and the relative increase in C extractability under drying and N extractability under freezing and drying.
Keywords
About the authors
M. I. Makarov
Lomonosov Moscow State University
Author for correspondence.
Email: mmakarov@soil.msu.ru
Russian Federation, Moscow, 119991
E. Yu. Kuznetsova
Lomonosov Moscow State University
Email: mmakarov@soil.msu.ru
Russian Federation, Moscow, 119991
T. I. Malysheva
Lomonosov Moscow State University
Email: mmakarov@soil.msu.ru
Russian Federation, Moscow, 119991
M. N. Maslov
Lomonosov Moscow State University
Email: mmakarov@soil.msu.ru
Russian Federation, Moscow, 119991
O. V. Menyailo
Sukachev Institute of Forest Research
Email: mmakarov@soil.msu.ru
Russian Federation, Krasnoyarsk, 660036