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Soil carbon sequestration due to post-Soviet croplandabandonment: estimates from a large-scale soil organiccarbon field inventory

  • The break-up of the Soviet Union in 1991 triggered cropland abandonment on a continental scale, which in turn ledto carbon accumulation on abandoned land across Eurasia. Previous studies have estimated carbon accumulationrates across Russia based on large-scale modelling. Studies that assess carbon sequestration on abandoned land basedon robust field sampling are rare. We investigated soil organic carbon (SOC) stocks using a randomized samplingdesign along a climatic gradient from forest steppe to Sub-Taiga in Western Siberia (Tyumen Province). In total, SOCcontents were sampled on 470 plots across different soil and land-use types. The effect of land use on changes in SOCstock was evaluated, and carbon sequestration rates were calculated for different age stages of abandoned cropland.While land-use type had an effect on carbon accumulation in the topsoil (0–5 cm), no independent land-use effectswere found for deeper SOC stocks. Topsoil carbon stocks of grasslands and forests were significantly higher thanthose of soils managed for crops and under abandoned cropland. SOC increased significantly with time sinceabandonment. The average carbon sequestration rate for soils of abandoned cropland was 0.66 Mg C ha1yr1(1–20 years old, 0–5 cm soil depth), which is at the lower end of published estimates for Russia and Siberia. Therewas a tendency towards SOC saturation on abandoned land as sequestration rates were much higher for recentlyabandoned (1–10 years old, 1.04 Mg C ha1yr1) compared to earlier abandoned crop fields (11–20 years old,0.26 Mg C ha1yr1). Our study confirms the global significance of abandoned cropland in Russia for carbonsequestration. Our findings also suggest that robust regional surveys based on a large number of samples advancemodel-based continent-wide SOC prediction.

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Metadaten
Author:Tim-Martin WertebachORCiD, Norbert Hölzel, Immo Kämpf, Andrey Yurtaev, Sergey Tupitsin, Kathrin KiehlORCiD, Johannes Kamp, Till Kleinebecker
Title (English):Soil carbon sequestration due to post-Soviet croplandabandonment: estimates from a large-scale soil organiccarbon field inventory
URL:https://onlinelibrary.wiley.com/doi/epdf/10.1111/gcb.13650
DOI:https://doi.org/10.1111/gcb.13650
ISSN:1354-1013
ISSN:1365-2486
Parent Title (English):Global Change Biology
Document Type:Article
Language:English
Date of Publication (online):2017/08/03
Release Date:2023/11/27
Tag:Carbon sequestration; Climate change mitigation; Land-use change; Self-restoration; Soil organic carbon
Volume:23
Issue:9
First Page:3729
Last Page:3741
Note:
Zugriff im Hochschulnetz
Faculties:Fakultät AuL
DDC classes:500 Naturwissenschaften und Mathematik / 500 Naturwissenschaften
Review Status:Veröffentlichte Fassung/Verlagsversion