Studies On The Influence Of Soil Temperature Control On Turfgrass Growth In Simulated Nest-type Beijing Olympic Stadium

Nest-type Beijing Olympic Stadium was simulated to study the impacts of soil temperature control on turfgrass growth. The international advanced movable modular turf building principle was adopted to load the temperature control system underneath the turf bed. Soil temperature controlled sports turf was constructed in the simulated stadium. Starting-up the temperature control system during the hot season can lower the temperature of soil temperature and sustain high quality of sports turf. This can fulfil the demand of palying games all year round in stadium. This research conducted to study the differences of air temperature, canopy and soil temperature. The changes of turfgrass growth and physiological responses were observed to study the heating impacts. It indicated that there was a significant heat accumulation in the simulated stadium. Applying soil temperature controlling can release the influence of heat accumulation to the turfgrass. The turfgrass maintenance measures also were discussed in this paper. The main results are shown as follows:(1) There was a significant heat accumulation in the simulated stadium due to its special structure. Under the outside temperature below 30℃, the effects on heat accumulation was relatively minor, with the temperature increase of 3-4℃in the stadium. However there were significant heat accumulation when outside temperature reached 35℃or above, with the temperature increase of 6-10℃and the temperature in the stadium was as high as 46-48℃. Further more, the canopy and soil temperature in the stadium were also significantly higher than outside (p<0.01).(2) The growth and physiological metabolizing were greatly influenced by the heat accumulation. The decline of turf density, chlorophyll content, soluble protein content and turf quality were enhanced greatly by the heat accumulation. The cell membrane was damaged by sever heat stress in stadium.(3) There was a close relationship between turfgrass quality and soi temperature conditions. It was showed that Lower soil temperature can release the influence of heat accumulation to the turfgrass and sustain high quality of turfgrass. It has a diurnal changes regulation in...