论文部分内容阅读
采用开路式涡动相关法对北方针叶林连续2个生长季节(2007和2008年)的碳交换及其影响因素进行分析.结果表明:北方针叶林生态系统总生产力(GEP)、生态系统呼吸(Re)和净生态系统碳交换(NEE)在6月下旬到8月中旬的生长旺盛期达到最大值,但各峰值出现的日期并不一致.2007和2008年北方针叶林生长季的日均GEP、日均Re、日均NEE分别为19.45、15.15、-1.45 g CO2.m-2.d-1和17.67、14.11、-1.37 g CO2.m-2.d-1,2007年碳交换明显大于2008年,这可能是生长季较高的平均温度及光合有效辐射引起(2007年为12.46℃和697μmol.m-2.s-1,2008年为11.04℃和639μmol.m-2.s-1).北方针叶林的GEP与温度和光合有效辐射具有很好的相关性,其中与气温的相关系数接近0.55(P<0.01);Re主要受温度调控,相关系数为0.66～0.72(P<0.01);NEE与光合有效辐射相关性最大,相关系数为0.59～0.63(P<0.01).
The open-circuit eddy covariance method was used to analyze carbon sequestration and its influencing factors in two consecutive growing seasons (2007 and 2008) of the northern coniferous forest.The results showed that the total ecosystem productivity (GEP) Breathing (Re) and net ecosystem carbon exchange (NEE) reached their peak during the vigorous growth from late June to mid-August, but the dates of the peaks were not consistent. The days of the growing season of the northern coniferous forest in 2007 and 2008 Average GEP, average daily Re, daily average NEE were 19.45,15.15, -1.45 g CO2.m-2.d-1 and 17.67,14.11, -1.37 g CO2.m-2.d-1,2007 Significantly higher than in 2008, which may be due to the higher average temperature during the growing season and to the photosynthetically active radiation (12.46 ℃ and 697μmol.m-2.s-1 in 2007 and 11.04 ℃ and 639μmol.m-2.s -1) .There is a good correlation between GEP and temperature and photosynthetically active radiation in the northern coniferous forest, and the correlation coefficient with temperature is close to 0.55 (P <0.01); Re is mainly controlled by temperature and the correlation coefficient is 0.66 ~ 0.72 P <0.01). The correlation between NEE and photosynthetically active radiation was the highest with a correlation coefficient of 0.59-0.63 (P <0.01).