【摘要】 为探讨青藏高原农田生态系统碳平衡规律及其影响因子 ,并揭示其对全球含碳温室气体源、汇变化的贡献与响应 ,1 998～ 1 999连续 2年在拉萨农业生态站农田用静态箱法和生物量取样法开展土壤—植被界面CO2 吸收与排放的试验研究。农作物生长季 ,以冬小麦为例 ,生长前期 (从播种到拔节 )土壤碳排放量高于植被碳固定 ,生长后期 (灌浆到成熟 )则是植被碳固定高于土壤碳排放量 ,从全年来看 ,土壤碳排放量略高于植被碳固定更多还原

【Abstract】 During the period from 1998 to 1999, absorption and emission of CO 2 in soil an d vegetation system were studied by the static box method used in fields and bio mass sampling,in the Lhasa Agro ecology Station. This experiment was designed to explore carbon balance in the field ecosystem on the Qinghai Tibet Plateau a nd its affecting factors, and disclose its contribution and response to the swit ch between pool and source of carbonaceous gas in the atmosphere.The CO 2 emissions in soil was more than the CO 2 assimilation of vegetation in the ea rly wheat growing period(from sowing to jointing),while in the late period(from milking to maturity)the assimilation exceeded the emissions. The annual CO 2 e missions in soil were a little more than the annual assimilation of vegetation.更多还原