safari, A., Faraji, M., Nael, M., Sheklabadi, M. (2020). Effect of wildfire on organic carbon fractions in the pasture soils of Alvand hillslope. , 8(2), 177-195. doi: 10.22092/sbj.2020.128483.179
a safari; Mona Faraji; Mohsen Nael; Mohsen Sheklabadi. "Effect of wildfire on organic carbon fractions in the pasture soils of Alvand hillslope". , 8, 2, 2020, 177-195. doi: 10.22092/sbj.2020.128483.179
safari, A., Faraji, M., Nael, M., Sheklabadi, M. (2020). 'Effect of wildfire on organic carbon fractions in the pasture soils of Alvand hillslope', , 8(2), pp. 177-195. doi: 10.22092/sbj.2020.128483.179
safari, A., Faraji, M., Nael, M., Sheklabadi, M. Effect of wildfire on organic carbon fractions in the pasture soils of Alvand hillslope. , 2020; 8(2): 177-195. doi: 10.22092/sbj.2020.128483.179

Effect of wildfire on organic carbon fractions in the pasture soils of Alvand hillslope

زیست شناسی خاک
Article 7, Volume 8, Issue 2, October 2020, Pages 177-195    PDF (544.71 K)
Document Type: Research Paper
DOI: 10.22092/sbj.2020.128483.179
Authors
a safari* 1; Mona Faraji2; Mohsen Nael3; Mohsen Sheklabadi4
1Professor, Soil Science Department, Bu Ali Sina University
2DM. Sc. Graduated, Bu Ali Sina University
3Assistant Professor, Soil Science Department, Bu Ali Sina University
4Associate Professor, Soil Science Department, Bu Ali Sina University
Abstract
The aim of this study was to recognize the transformation of soil organic matter fractions in burned and unburned pasture lands. The study area was a pasture land located in Alvand hillslope (toposequence), near the village of Haidara, Hamadan. The low-intensity wildfire occurred in the hillslope in autumn (October) 2015, in such a way that half the toposequence was burned up to the bottom symmetrically. Soil samples were gathered from three locations (up, mid, and down) of burned and unburned parts of toposequence 2 (December, 2015-autumn) and 9 months (June, 2016-spring) after wildfire occurrence. In each location, soil sampling was carried out in two parts; between the bushes and under their canopies and in two depths; 0-5 (upper) and 5-10 cm (lower) layers, respectively. Litter samples were also gathered in a 30*30 cm2 plot for each burnt and unburnt parts of toposequence. All sampling was carried out in three replications. The light fraction of organic matter (LF), cold and hot water extractable organic carbons (CWEOC and HWEOC), biomass carbon (BC), total organic carbon (TOC), and basal respiration (BR) were measured. The data analyzed in split-split plot design for each layer (upper and lower) and each season (autumn and spring) of sampling separately. In the mentioned statistical design, sampling location on toposequence (up, mid, and down) was regarded as the main plot, fire impacted area (burnt and unburnt) as a subplot, and sampling location related to bushes (between and under canopy) as sub-sub plot. Soil OC and BR were higher in the upper layer and under the bush's canopy rather than the lower layer and between bushes. In general wildfire increased TOC (42%), LF (41%), and BC (52%) in the sampled soils. In contrast, CWEOC, HWEOC, and BR in burnt soils were 61, 52, and 48% lower compared to those in unburnt soils, respectively. Although in autumn the litter content was lower on burnt soils compared to those in unburnt soils (50%), in spring it significantly increased on burnt soils. The increases in litter on burnt and unburnt soils were 4.5 and 2 times, respectively. The study showed that wildfire and burning of plant cover by producing biochar on the pastures can improve carbon sequestration in soil.
Keywords
Basal respiration; Biochar; Carbon sequestration; Organic carbon fractionation; Plant canopy
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