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Wenzel, WW; Duboc, O; Golestanifard, A; Holzinger, C; Mayr, K; Reiter, J; Schiefer, A.
(2022): Soil and land use factors control organic carbon status and accumulation in agricultural soils of Lower Austria
GEODERMA. 2022; 409, 115595 FullText FullText_BOKU

Policies for restoring soil health and mitigating climate change require information on soilorganic carbon (SOC) stocks and their spatial and temporal variation, and related sequestration potentials. Using the province of Lower Austria as environmentally diverse model region, we present a detailed analysis of SOC stocks, saturation potentials and deficits along with SOC monitoring data for the past three decades. Using the province's soil database (sampling 1991) we estimated the saturation potential for mineral-protected C (C-sat) by boundary line regression to the particle fraction <20 mu m (f(<20 mu m)). Compared to published work, parameterization by Lower Austrian data yielded considerably larger C-sat values which agree well with independent maximum organic C load estimates based on specific surface area. C-sat is particularly small in to psoils of regions with non-calcareous igneous rock, but large on fine-textured quaternary and tertiary sediments, and weathering residuals of carbonate rock. During the past three decades, the medians of SOC in grassland to psoils (0-20 cm) increased significantly (p < 0.05) by 29.7% from 39.4 to 51.1 g kg(-1), corresponding to annual accumulation rates of 0.87 Mg C ha(-1). SOC in cultivated soils increased by 17.1% from 12.7 to 14.8 g kg(-1) (0.20 Mg C ha(-1) y(-1)). Because of the large initial C gap, the observed SOC accumulation is not related to C-def but likely reflects improved soil management.
Authors BOKU Wien:
Duboc Olivier
Golestanifard Alireza
Holzinger Christian
Mayr Franz Josef Kilian
Reiter Johanna
Schiefer Anna
Wenzel Walter

Find related publications in this database (Keywords)
Soil carbon sequestration
Carbon stocks
Carbon deficit
Soil monitoring
Soil health

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