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- W1546468478 abstract "The forest litter and fermentation horizons (CF) is a dynamic reservoir of carbon (C) in forest soils. The methodologies that quantify CO2 emissions from the decomposition are scarce and require long periods of measurement. Methods are required to generate CO2 emission of these organic layers measuring short times. The objectives were: to generate a protocol for measuring CO2 emissions from the decomposition of litter and CF with manometric respirometer (OxiTop ®). Measure C reservoirs of forest litter and CF with different conditions. Measure the CO2 emission mulch and CF decay rates a respirometer. Analyze the chemical characteristics of mulches and fermentation horizons. Optimal conditions were determined to measure breathing in vitro on this instrument, controlling the amount of sample (5, 10, 20 and 40 g), humidity (20, 40, 60 and 80 %) and temperature (25 °C) in within 10 days. It was found that with 10 g of sample and 60 % humidity recorded the highest CO2 emission rate (2 350 mgCO2 kg -1 ) with smaller amplitude of variation (33 mgCO2 kg -1 ). The forest litter and CF was sampled in natural forests of Hidalgo , Tlaxcala and Estado de Mexico (F. grandifolia , P. montezumae and Quercus spp) and managed (Pinus patula) in stands harvested in different years (1986, 1987, 1988, 1993 and 1995). Reservoirs was determined C and chemical properties (pH, C, N, lignin, C/N, lignin/N, humins) and CO2 emissions and emission rates with the conditions specified in the protocol. In general, the reservoirs of C were higher in CF (4 t ha -1 ) that the forest litter (2 t ha -1 ) due to the amount of biomass present in these layers. However, the C concentration was higher in the forest litter that horizons fermentation. The CO2 emission was higher in the forest litter (18 000 mgCO2 kg -1 ) than in CF (2000 mgCO2 kg -1 ) in all forests and this decreased with depth of CF, since in the CF there are higher contents of lignin and humins, recalcitrant elements to decay and decreased CO2 emissions over time. In the five stands harvested, CO2 emission was higher with newer time from harvest (1995) and decreased to a greater time from harvest (1986). Because the forest litter and CF had different stages of decomposition, which we observed the effect of forest management on the dynamics of C in the decomposition." @default.
- W1546468478 created "2016-06-24" @default.
- W1546468478 creator A5006262174 @default.
- W1546468478 date "2013-01-01" @default.
- W1546468478 modified "2023-09-27" @default.
- W1546468478 title "Balance de carbono y tasa de descomposición de mantillo y horizontes de fermentación de suelos forestales." @default.
- W1546468478 hasPublicationYear "2013" @default.
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