Soil biological quantity and quality parameters of grasslands in various landscape zones
2011
Duffkova, R., Vyzkumny Ustav Melioraci a Ochrany Pudy, Prague (Czech Republic) | Macurova, H., Vyzkumny Ustav Melioraci a Ochrany Pudy, Prague (Czech Republic)
In three landscape zones of a permanent grassland catchment (discharge zone, D; transient zone, T; and recharge zone, R; Crystallinicum, Czech Republic), soil moisture (SM) by volume and soil biological quantity and quality characteristics, e.g. oxidizable C (Cox), hot water soluble C (Chws), microbial biomass C (Cmic), nitrification (NITR), aerobic N mineralization (MIN) and basal respiration rates (Rbas), metabolic quotient (qCO2: Rbas/Cmic) and microbial quotient (Cmic/Cox) were estimated in the surface soil layer. We found out positive correlation of Cmic and Cmic/Cox with SM, or NITR, MIN, Rbas and Cmic with Chws, but no relationship between SM on the one hand and NITR, MIN, Rbas or Cox on the other hand. The wettest zone D with extremely low pH displayed the highest Cmic (1,081 mg/kg) and Cmic/Cox (5.29%), and the lowest qCO2 (31 microgC/day/mgCmic). Soil drought in zones T and R reduced Cmic and Cmic/Cox (939, 1,029, and 3.72, 3.83, respectively), and augmented qCO2 (42; 51). Rainfall following a prolonged dry period reduced MIN and NITR in permeable zone R as a result of fast microbial regeneration (average in D: 2.24; 2.48 kg N/ha/day, T: 2.62; 2.82 kg N/ha/day, R: 1.51; 1.95 kg N/ha/day).
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