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Atmosphere 2018, 9(8), 308; https://doi.org/10.3390/atmos9080308

Changes of Soil C Stock under Establishment and Abandonment of Arable Lands in Permafrost Area—Central Yakutia

1
Institute for Biological Problems of Cryolithozone, Siberian Branch, Russian Academy of Science, 677980 Yakutsk, Russia
2
Melnikov Permafrost Institute, Siberian branch, Russian Academy of Science, 677010 Yakutsk, Russia
3
Graduate School of Agriculture, Hokkaido University, Sapporo 060-8589, Japan
*
Author to whom correspondence should be addressed.
Received: 10 July 2018 / Revised: 6 August 2018 / Accepted: 7 August 2018 / Published: 8 August 2018
(This article belongs to the Special Issue C and N Cycling and Greenhouse Gases Emission in Agroecosystem)
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Abstract

Central Yakutia is in one of the most northern agricultural centers of the world. In this territory a notable area of arable land was made by removing the boreal Taiga with the primary purpose of crop cultivation. Such a method of cultivation significantly changes soil total carbon (STC, soil organic carbon + soil carbonate carbon) balance, because of the destroyed upper humus horizon. Soil organic carbon (SOC) of cultivated arable lands is almost a half of that in forest. In abandoned arable lands with grass vegetation, the recovery of SOC has increased to 30% in comparison with cultivated arable lands. On arable lands recovering with new growth of trees, the SOC is related to the abandonment period. Soil carbonates carbon (SCC) content was significantly lower than SOC and showed significant difference among abandoned and other types of arable lands. Objectives of this study are to identify how STC stocks change in response to conversion of the forests to agricultural land and to analyze the arable land system’s recovery process after abandonment. Furthermore, after transformation of forest to arable land, a significant decrease of STC was observed, primarily due to mechanical loss after plant residue removal. It was also identified that the restoration and self-recovery of STC in abandoned arable lands of Central Yakutia continuously and slightly increase. Grass vegetation regenerates STC for 20 years. While the difference of average STC of forests and cultivated arable lands reached 41%, a new growth of forest on some abandoned arable land follows the tendency of STC decrease due to a low productivity level and suppressing effect on grass vegetation. View Full-Text
Keywords: Central Yakutia; arable land; soil organic carbon; soil carbonate carbon; soil carbon recovery Central Yakutia; arable land; soil organic carbon; soil carbonate carbon; soil carbon recovery
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Desyatkin, A.R.; Iwasaki, S.; Desyatkin, R.V.; Hatano, R. Changes of Soil C Stock under Establishment and Abandonment of Arable Lands in Permafrost Area—Central Yakutia. Atmosphere 2018, 9, 308.

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