Analysis of soil respiration diurnal dynamics and factors influencing it in enclosednatural grasslands under different topographies in the Loess Plateau

Abstract

Abstract: The diurnal dynamics of soil respiration in enclosed grasslands of gullied-hilly areas of the Loess Plateau, were measured by closed chamber infrared CO₂ gas analyzer and the relationships between soil respiration and soil temperature, soil water content, underground biomass and topography were analyzed. Diurnal soil respiration showed a single-peak curve with the lowest value of 0.393-1.103 μmol/(m²·s) in the early hours of the morning and a peak value of 1.034-1.405 μmol/(m²·s) at 14:00. A sine curve could be fitted to the data and all relationships between soil respiration rate and soil temperature could be depicted by an exponential function. There were differences in soil daily average respiration rate between plots: In flat grassland it was 1.229 μmol/(m²·s); on north-east facing grassland slopes of 15°, 30°, and 45° it was 1.138 ,1.033 and 0.890 μmol/(m²·s), respectively, while on similar south-west facing slopes it was 1.036, 0.859, and 0.379 μmol/(m²·s), respectively. Soil respiration rate declined as slope increased, and that of south-west facing grassland was lower than that of north-east facing grassland, changes that were consistent with soil water content and underground biomass. These differences were determined by spatial distribution differences of soil water content and underground biomass which were affected by topography, but there was no effect of temperature between plots.

CLC Number:

LI Zhi-gang, HOU Fu-jiang. Analysis of soil respiration diurnal dynamics and factors influencing it in enclosednatural grasslands under different topographies in the Loess Plateau[J]. Acta Prataculturae Sinica, 2010, 19(1): 42-49.

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