COS 5-3 - CANCELLED - Different soil respiration treatments respond differently to extreme snowfall events in Ailao Mountain subtropical forest of China

Abstract: Abstract

Global climate change has great impact on soil respiration. To better understand the response of soil respiration and its environmental factors (soil temperature and soil moisture) to heavy snowfall events with different treatments in Ailao Mountain subtropical evergreen broadleaf forests.The multichannel automated chamber system was used with four treatments, namely, control treatment (CK), trenching treatment (NR), trenching treatment with warming (NRW) and litter removal treatment (LR), in Ailao Mountain forests. The period of the snowfall event was divided into three periods: before the heavy snowfall event (BS), during the heavy snowfall event (DS) and after the heavy snowfall event (AS). The soil respiration decreased during snowfall events except in the NRW. After the snowfall event period, the soil respiration of all treatments gradually increased, but it took time for the soil respiration to reach its normal period. Although the exponential relationship between soil respiration and soil temperature was statistically significant (p < 0.05) for all treatments and all periods, the sensitivity of soil respiration to soil temperature declined during the rainfall events. The combined effect of soil temperature and soil moisture on soil respiration was statistically significant (p < 0.05) in all treatments. Furthermore, the trenching effect decreased by 64%, the warming effect increased by 85% and the litter removal effect increased by 64% according to heavy snowfall events. The different treatments of soil respiration contributed to different responses to severe snowfall events in Ailao Mountain forests.