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2008年,采用涡度协方差法测定了黑龙江省尚志市帽儿山地区落叶松人工林的CO2通量,并于生长季(5—10月)不同月份测定了落叶松叶片光合日变化.结果表明:不同时间段环境因子变化对落叶松人工林净生态系统交换量的影响存在差异,下午(12:00—24:00)的净生态系统交换量对其饱和蒸汽压亏缺的变化反应较上午(0:00—12:00)迟钝;上午光能利用效率为0.6284mol.mol-1,是下午的1.14倍;随温度上升,上午净生态系统交换量的增幅是下午的1.5倍(气温>15℃).这种差异使落叶松林净碳交换量的88%在上午完成,而下午仅完成净碳交换量的12%;上、下午生态系统生产力分别占全天的60%和40%,上午叶片的光合能力为下午的3倍.落叶松人工林全年净生态系统交换量在263～264gC.m-2,生态系统呼吸在718～725gC.m-2,总初级生产力在981～989gC.m-2.
In 2008, the CO2 fluxes of Larix gmelini plantation in Maoershan area, Shangzhi City, Heilongjiang Province were measured by the method of vorticity covariance, and the diurnal changes of photosynthetic rate were measured in different months of growing season (May-October) .Results The results showed that there were differences in the effects of environmental factors on the net ecosystem exchange of Larix gmelinii plantations in different time periods. The net ecosystem exchange volume in the afternoon (12: 00-24: 00) responded to the change of its saturated vapor pressure deficit Morning (0: 00-12: 00) retarded; morning light energy utilization efficiency of 0.6284mol.mol-1, 1.14 times in the afternoon; with temperature rise, the net ecosystem exchange in the morning increased by 1.5 times in the afternoon (temperature > 15 ℃) .This difference made 88% of the net carbon exchange of larch forests completed in the morning, while only 12% of the net carbon exchange was completed in the afternoon and 60% and 40% of the whole day respectively in the upper and the afternoon ecosystems, , The photosynthetic capacity of the leaves in the morning was 3 times of the afternoon.The annual net ecosystem exchange of larch plantation was 263-264gC.m-2, the ecosystem respiration was 718-725gC.m-2, the total primary productivity was 981 ~ 989gC.m-2.