Alpine wetland vegetation typical dynamic change characteristics of soil respiration and its components and the response of temperature and humidity in Qinghai-Tibet plateau

摘要

In the growing seasons of 2011, 2012, 2014 (May-Oct), we observed the soil respiration of the typical vegetation (Carex moorcroftii Falc.ex Boott) in Qinghai Lake alpine wetland. The experimental result shows that soil respiration value reached the highest in Aug at 4.45 ± 0.22 μmol/m~2/s, the lowest value appeared at the beginning and the end of the growing season; the average soil respiration during the growing season was 2.05 ± 0.41 μmol/m~2/s, the value of CO_2 to be release about 1169.0 ± 233.8 g/m~2. The response of the soil respiration to temperature and humidity achieved significant correlation (P < 0.001), the influence of heterotrophic respiration on temperature (P < 0.001) was higher than that on humidity (P = 0.003) under. On the temperature sensitivity soil respiration Q_(10) = 3.25, heterotrophic respiration Q_(10) = 4.71. Water and temperature can explain 36.8% of soil respiration and, 50.8% of heterotrophic respiration.