Modeling Soil Respiration of Alpine Meadow on the Northern Tibet Plateau Using MODIS and Climate Data

The soil respiration,soil heterotrophic respiration and root respiration of alpine meadow in Damxung County were estimated by using MODIS land surface temperature and the equations between soil(heterotrophic) respiration and soil temperature during the growing season(from May to October).Results showed that the soil respiration,soil heterotrophic respiration and root respiration total amount were 1059.11,393.80 and 665.31 g CO2·m-2 during the growing season in 2004,respectively,while those were 1114.77,423.34 and 691.43 g CO2·m-2 during the growing season in 2005,respectively.Seasonal changes of soil respiration,soil heterotrophic respiration and root respiration were obvious: they increase rapidly in the beginning 153 day of year(DOY) and kept high level until 241 DOY then decrease dramatically.The ratio of root respiration to soil respiration ranged from 48% to 69% with seasonal changing.The Q10 values of soil respiration and soil heterotrophic respiration ranged from 1.13 to 1.17 and from 1.12 to 1.27,respectively.This study may provide basis for scaling-up of soil respiration.