Effect of Fire Disturbance on Nutrient Content and Soil Microbial Biomass of Two Forest Types

doi:10.7525/j.issn.1673-5102.2015.01.016

Abstract

Abstract: In the burned area of Betula platyphylla and Larix gmelinii forests shortly after the fire in Yichun, we used the chloroform fumigation extraction method to examine the content of soil microbial biomass carbon(C_mic) and soil microbial biomass nitrogen(N_mic) from the two forest types in different months(June, August, October and December). We explored the relationship between C_mic and N_mic, and the influencing factors including soil water content, soil pH, soil temperature, soil organic carbon and soil total nitrogen after the fire. The overall mean C_mic of the burned plots was lower than that in the unburned plots, and the overall mean N_mic was increased after the fire in B.platyphylla. Compared with the unburned plots, C_mic had no significant effect in different months shortly after the fire, the mean C_mic in June, August, October and December in the burned plots(unburned plots) was 1 389.6(1247.2), 886.7(759.0), 1 098.9(1 052.6) and 1 421.4(1 749.7) mg·kg^-1, respectively, yet the N_mic was significant higher than that in the unburned plots in June, August and October with the mean N_mic of 214.5(143.4), 101.9(67.5), 119.6(89.4) and 150.2(183.3) mg·kg^-1, respectively. The soil microbial biomass was positively correlated to the soil water content, and N_mic was influenced by soil pH significantly. Compared with the unburned plots, the overall mean C_mic and N_mic of the burned plots were lower than those in L.gmelini. The soil microbial biomass had no significant effect throughout different months of L.gmelinii. The mean C_mic in June, August, October and December in the burned plots(unburned plots) was 689.7(695.9), 612.3(910.4), 361.6(474.7) and 1288.5(1353.8) mg·kg^-1, respectively, and the mean N_mic was 105.7(124.4), 91.4(111.4), 44.0(76.9) and 118.9(134.5) mg·kg^-1, respectively. C_mic and N_mic were significantly positively correlated with soil water content, but negatively with soil pH. The overall mean soil pH ,soil organic carbon and soil total nitrogen of the burned plots were higher than the unburned plots, yet oil water content was decreased in Betula platyphylla. The overall mean soil pH ,soil organic carbon and soil total nitrogen of the burned plots were lower than that in the unburned plots, however, soil water content was increased after the fire in L.gmelinii.

Key words: soil microbial biomass, fire disturbance, soil nutrient, Xiaoxing&rsquo, an Mountains

CLC Number:

HU Hai-Qing；LI Ying；ZHANG Ran；WU Wei；SUN Long*. Effect of Fire Disturbance on Nutrient Content and Soil Microbial Biomass of Two Forest Types[J]. Bulletin of Botanical Research, 2015, 35(1): 101-109.

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