国际森林土壤研讨会课件Presentation in Fuzhou20151027-Liu Shirong.pptxVIP

Soil warming and drought impact soil respiration and its partitioning in a warm temperate forest;Outline;Figure SPM.1aObserved globally averaged combined land and ocean surface temperature anomaly 1850-2012;Average global surface temperature is likely to rise 1.0–3.7°C by the end of the century (IPCC, 2013);Annual mean precipitation trend (1956-2002) in China (Xu et al., 2009);Warming rate:0.213℃/10a，breaking point occurs in 1995 No obvious trend in annual mean precipitation change, but with larger interannual and spatial variations ，and breaking point occurs in 1993;;Sustained drought events in China;The importance of forests and soils;;The mechanisms of soil environmental and biological processes regulating soil CO2 fluxes under warming remain unclear. Whether the response of soil respiration and its components to climate warming depend on soil water conditions? and How？ ;To assess the effects of warming and drought on soil respiration and its components, soil microbial community, and the fine root biomass; To explore the dominate factors affecting the soil respiration response to warming and drought. ;;Baotianman Ecological Station;Climate and Vegetation in BTM;Watershed hydrology research: 1. Meteorological observation 2. Canopy Interception 3. Runoff and soil water profile Vegetation monitoring plots: Different types of forests 100×100 m with 5 repetitions Flux measurement CO2xH2O flux in 2008 Methane flux in 2014 ;Climate Change Simulation Experiment in BTM;Climate Change Simulation Experiment in BTM;Throughfall exclusion： A 4×5 m roof covered with eight 5×0.4m plastic sheets mounted to iron wire frames was installed above each throughfall exclusion plot (3×4 m) with 0.5 m distance to plot edge in the forest understory.;Lining plastic sheet for isolation;Climate Change Simulation Experiment in BTM;Outline; Changes in soil temperature and Soil moisture with different treatments ;Response of soil respiration and its part