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Article

Do Fire Regime Attributes Affect Soil Biochemical Properties in the Same Way under Different Environmental Conditions?

1
Area of Ecology, Department of Biodiversity and Environmental Management, Faculty of Biological and Environmental Sciences, Universidad de León, 24071 León, Spain
2
Area of Ecology, Department of Functional Biology, Faculty of Biology, Universidad de Santiago de Compostela, 15782 Santiago de Compostela, Spain
*
Author to whom correspondence should be addressed.
Forests 2020, 11(3), 274; https://doi.org/10.3390/f11030274
Received: 28 December 2019 / Revised: 24 February 2020 / Accepted: 25 February 2020 / Published: 28 February 2020
(This article belongs to the Special Issue Forest Post-Fire Regeneration)
Global change is altering fire frequency and severity in many regions across the world. In this work, we studied the impact of different frequency and severity regimes on the soil biochemical properties in burned areas with different environmental conditions. We selected three sites dominated by pine ecosystems along a Mediterranean-Transition-Oceanic climatic gradient, where we determined the fire frequency, and severity of the last wildfire. Four years after the last wildfire, we established 184 4 m2 plots. In each plot, we collected a composed soil sample from a 3 cm depth, and measured several ecological variables potentially affected by the fire frequency and severity (cover of bare soil, cover of fine and coarse plant debris, cover of vegetation, and vegetation height). From each soil sample, we analyzed the enzymatic activities corresponding to the biogeochemical cycles of carbon, nitrogen, and phosphorus (β-glucosidase, urease, and acid-phosphatase, respectively), and the microbial biomass carbon. The results indicated that fire frequency only played a significant role in soil biochemical properties at the Mediterranean and Transition sites. Specifically, we found that increases in frequency contributed to increased urease and phosphatase activities (at the Transition site), as well as microbial biomass carbon (at the Mediterranean and Transition sites). In relation to burn severity, we found opposite patterns when comparing the Mediterranean and Oceanic sites. Specifically, increased severity significantly decreased β-glucosidase, urease, and microbial biomass carbon at the Mediterranean site, whereas at the Oceanic one, severity significantly increased them. Burn severity also decreased microbial biomass carbon at the Transition site. Our results also indicated that, overall, fire frequency determined the studied ecological variables at the Mediterranean and Transition sites, but clear indirect effects on biochemical properties due to changes in ecological variables were not found. This study adds to the knowledge on the impact of shifts in fire regimes on soils in the current context of change. View Full-Text
Keywords: burn severity; fire frequency; enzymatic activities; microbial biomass; environmental conditions burn severity; fire frequency; enzymatic activities; microbial biomass; environmental conditions
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MDPI and ACS Style

Fernández-García, V.; Marcos, E.; Reyes, O.; Calvo, L. Do Fire Regime Attributes Affect Soil Biochemical Properties in the Same Way under Different Environmental Conditions? Forests 2020, 11, 274. https://doi.org/10.3390/f11030274

AMA Style

Fernández-García V, Marcos E, Reyes O, Calvo L. Do Fire Regime Attributes Affect Soil Biochemical Properties in the Same Way under Different Environmental Conditions? Forests. 2020; 11(3):274. https://doi.org/10.3390/f11030274

Chicago/Turabian Style

Fernández-García, Víctor, Elena Marcos, Otilia Reyes, and Leonor Calvo. 2020. "Do Fire Regime Attributes Affect Soil Biochemical Properties in the Same Way under Different Environmental Conditions?" Forests 11, no. 3: 274. https://doi.org/10.3390/f11030274

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