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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
In order to explore the carbon balance of cropland ecosystem in Qinghai-Tibet Plateau and its influencing factors, and to reveal its contribution to global carbon source and sink changes, 1 998 ~ 1 999 two years in succession in Lhasa Agricultural Station static box Experimental Study on CO2 Absorption and Emission at Soil - Vegetation Interface with the Method of Sampling and Biomass Sampling. In crop growing season, taking winter wheat as an example, the soil carbon emission in the early growing stage (from sowing to jointing) is higher than that of vegetation carbon. In the late growth stage (filling to maturing), the vegetation carbon fixation is higher than the soil carbon emission. From the perspective of the whole year , Soil carbon emissions slightly higher than the vegetation carbon fixation