Organic matter stability in forest-tundra soils after wildfire

被引:2
作者
Filimonenko, Ekaterina [1 ]
Uporova, Maria [1 ]
Prikhodko, Nikolai [1 ]
Samokhina, Nataliya [1 ]
Belyanovskaya, Alexandra [1 ]
Kurganova, Irina [1 ,2 ]
de Gerenyu, Valentin Lopes [1 ,2 ]
Merino, Carolina [3 ]
Matus, Francisco [4 ,5 ]
Chen, Chengrong [6 ,7 ]
Alharbi, Sulaiman Almwarai [8 ]
Soromotin, Andrey [1 ]
Kuzyakov, Yakov [1 ,9 ,10 ]
机构
[1] Univ Tyumen, Volodarskogo Str 6, Tyumen 625003, Russia
[2] RAS, Inst Physicochem & Biol Problems Soil Sci, Inst Skaya 2, Moscow 142290, Russia
[3] Univ La Frontera, Sci & Technol Bioresource Nucleus, Temuco 4811230, Chile
[4] Univ La Frontera, Dept Chem Sci & Nat Resources, Lab Conservat & Dynam Volcan Soils, Temuco, Chile
[5] Univ La Frontera, Network Extreme Environm Res, Temuco, Chile
[6] Griffith Univ, Australian Rivers Inst, Nathan Campus, Nathan, Qld 4111, Australia
[7] Griffith Univ, Sch Environm & Sci, Nathan Campus, Nathan, Qld 4111, Australia
[8] King Saud Univ, Coll Sci, Dept Bot & Microbiol, Riyadh 11451, Saudi Arabia
[9] Univ Gottingen, Dept Soil Sci Temperate Ecosyst, D-37077 Gottingen, Germany
[10] RUDN Univ, Peoples Friendship Univ Russia, Moscow 117198, Russia
基金
俄罗斯科学基金会;
关键词
Cold climate ecosystems; Cryosol properties; Carbon and nitrogen cycles; Soil organic matter; Thermal analysis; Energy release; Carbon stability and sequestration; Microbial activity; Temperature sensitivity; TEMPERATURE SENSITIVITY; MICROBIAL BIOMASS; THERMAL-ANALYSIS; CARBON STORAGE; FIRE; DECOMPOSITION; NITROGEN; ASH; TRANSFORMATION; RESPIRATION;
D O I
10.1016/j.catena.2024.108155
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
Wildfires in the north circumpolar region are increasing in response to global warming and raised precipitation irregularity. Beside the short-time effects of wildfires on carbon (C) cycle by CO2 boost, the decreased amounts and availability of remaining organic matter slow down microbial decomposition over mid- and long-term. Our objective was to investigate the effects of low-intensity surface wildfire common in forest-tundra on soil organic matter (SOM) stability. We hypothesized that wildfire crucially increases organic matter stability due to pyrogenic C production, which reduces SOM availability to microorganisms. To prove this hypothesis, we analyzed SOM stability by thermal analysis (thermogravimetry and differential scanning calorimetry) combined with microbial respiration and assessed temperature sensitivity of SOM decomposition. Wildfire in forest-tundra decreased the thermal labile SOM pool by 1.6-1.9 times and increased the most stable SOM pool by 2.1 times in the O-horizon and 1.3 times in the mineral topsoil. Fire increased SOM thermal stability stronger in the Ohorizon compared to the mineral topsoil. For the first time, we revealed the relationship between SOM thermal stability and microbial activity in Cryosols. The increased stability of SOM in Cryosols raised temperature sensitivity (Q10) of SOM decomposition by microorganisms, decreased microbial respiration (CO2 efflux) and microbial biomass content. Concluding, wildfires have strong effects on soil and microbial properties, leaving predominantly stable organic matter pools, which are less available for microorganisms.
引用
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页数:11
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