Next Article in Journal
A New Geospatial Model Integrating a Fuzzy Rule-Based System in a GIS Platform to Partition a Complex Urban System in Homogeneous Urban Contexts
Next Article in Special Issue
Permafrost-Landscape Map of the Republic of Sakha (Yakutia) on a Scale 1:1,500,000
Previous Article in Journal
Algal Bloom Exacerbates Hydrogen Sulfide and Methylmercury Contamination in the Emblematic High-Altitude Lake Titicaca
Article Menu
Issue 12 (December) cover image

Export Article

Open AccessArticle
Geosciences 2018, 8(12), 439; https://doi.org/10.3390/geosciences8120439

Landscape Microzones within Thermokarst Depressions of Central Yakutia under Present Climatic Conditions

1
Institute for Biological Problems of Cryolithozone, Siberian Branch, Russian Academy of Science, Yakutsk 677980, Russia
2
Melnikov Permafrost Institute, Siberian branch, Russian Academy of Science, Yakutsk 677010, Russia
3
Faculty of Bioresource Sciences, Akita prefectural university, 241-438 AzaKaidobata-Nishi, Shimoshinjo Nakano, Akita 010-0195, Japan
*
Author to whom correspondence should be addressed.
Received: 31 October 2018 / Revised: 22 November 2018 / Accepted: 23 November 2018 / Published: 27 November 2018
(This article belongs to the Special Issue Permafrost Landscapes: Classification and Mapping)
Full-Text   |   PDF [2590 KB, uploaded 27 November 2018]   |  

Abstract

Thermokarst (alas) of Central Yakutia is an intrazonal dynamic landscape in the form of rounded depressions with peculiar soils and meadow vegetation, microclimate, and fauna that are very different from the surrounding typical taiga landscapes. During the formation of alas depression, complete processing of thawed ground with the formation of new soils occurs and entirely changes the biogeochemical cycle. Because this system is closed, all water-soluble substances, such as N/C and soluble salts, etc., accumulate inside the depression. Using standard methods and instruments, we measured the main properties of alas soils. Depending on the hydrothermal and physicochemical regimes, thawing depth, and greenhouse gas (GHG) flux, three main belts of soils and vegetation were distinguished within the alas: (1) steppe meadow, located on most elevated places, not sufficiently moistened, with alas steppe soils and steppe vegetation; (2) middle meadow, located lower than stepped meadow in elevation, normally moist, with alas sod-meadow soils and highest productivity vegetation; and (3) wet meadow, located around the lake, excessively moistened, with alas marshy sod-meadow soils and marsh vegetation. Therefore, the soils of wet and real meadows, due to the abundance of organic matter, are significant sources of CO2 and CH4, especially in humid years. Under the climate warming observed over recent decades in this territory, the alas ecosystem has undergone considerable change. Thus, the classification and mapping of belts within the alas can have both applied and fundamental importance. View Full-Text
Keywords: thermokarst; central yakutia; thermokarst soils; thermokarst vegetation; hydrothermal regime; physicochemical regime; GHG emission; thermokarst microzones thermokarst; central yakutia; thermokarst soils; thermokarst vegetation; hydrothermal regime; physicochemical regime; GHG emission; thermokarst microzones
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Desyatkin, A.; Takakai, F.; Nikolaeva, M. Landscape Microzones within Thermokarst Depressions of Central Yakutia under Present Climatic Conditions. Geosciences 2018, 8, 439.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Geosciences EISSN 2076-3263 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top