Seasonal changes in microbial biomass and nutrient flush in forest soils |
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| Authors: | M Díaz-Raviña M J Acea T Carballas |
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| Institution: | (1) Instiruto de Investigaciones Agrobiológicas de Galicia (CSIC), Campus Universitario, Apartado de correos 122, E-15080 Santiago de Compostela, Spain |
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| Abstract: | Microbial biomass and N, P, K, and Mg flushes were estimated in spring, summer, autumn, and winter samples of different forest soils. The microbial biomass showed significant seasonal fluctuations with an average distribution of 880±270  g C g-1 soil in spring, 787±356 g C g-1 soil in winter, 589±295 g C g-1 soil in summer, and 560±318 g C g-1 soil in autumn. The average annual concentrations of C, N, P, K, and Ca in the microbial biomass were 704, 106, 82, 69 and 10 g g-1 soil, respectively. Microbial C represented between 0.5 and 2% of the organic soil C whereas the percentage of microbial N with respect to the total soil N was two-to threefold higher than that of C; the annual fluctuations in these percentages followed a similar trend to that of the microbial biomass. Microbial biomass was positively correlated with soil pH, moisture, organic C, and total N. The mean nutrient flush was 31, 15, 7, and 4 g g-1 soil for N, K, P, and Mg, respectively, and except for K, the seasonal distribution was autumn  spring  winter summer. The average increase in available nutrient due to the mineralization of dead microbial cells was 240% for N, and 30, 26, and 14% for P, K, and Mg, respectively. There was a positive relationship between microbial biomass and the N, P, K, and Mg flushes. All the variables studied were significantly affected by the season, the type of soil, and the interaction between type of soil and season, but soil type often explained most of the variance. |
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| Keywords: | Microorganisms Macronutrients N P K and Mg Atlantic European ecosystem Temperate humid zone Annual changes |
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