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对千烟洲人工针叶林碳通量与环境影响因子进行了分析,研究了23m和39m两层高度碳通量的时空变化特征,对2003年该生态系统的碳收支状况进行了初步估算.研究结果表明:影响净生态系统交换(NEE)的环境因子主要是光合有效辐射(PAR)、土壤温度等.白天(有光期)的NEE对于PAR的响应符合直角双曲线方程.通过摩擦速度的阈值对夜间数据进行了筛选,夜间(无光期)的NEE对于温度和饱和水汽压差的响应呈明显的指数关系.该生态系统全年各个月均表现为碳汇;碳通量各月的平均日变化和季节变化趋势明显.2003年各月NEE值以5,6月最高,日最大值为?0.61~?0.67mg·CO2·m?2·s?1;盛夏7月遭遇了严重伏旱及持续高温,NEE值约为5~6月的2/3,日最大值为?0.40mgCO2·m?2·s?1;秋末到冬季由于持续干旱,NEE为全年最低,日最大值为?0.29~?0.35mg·CO2·m?2·s?1.2003全年碳收支估算值在?0.553~?0.645kgC·m?2之间.
The carbon fluxes and environmental impact factors of artificial coniferous forest in Qianyanzhou were analyzed. The temporal and spatial variations of carbon flux in two layers of 23m and 39m were studied. The carbon budget of the ecosystem in 2003 was initially estimated The results showed that the environmental factors influencing net ecosystem exchange (NEE) were mainly photosynthetically active radiation (PAR), soil temperature, etc. The daytime (bright) NEE response to PAR was in accordance with the rectangular hyperbolic equation.Through the friction velocity The nighttime (Naked light) NEE has a clear exponential relationship to the response of temperature and saturated vapor pressure difference, which shows carbon sequestration every month of the year, The average diurnal variation and the seasonal change trend are obvious.The NEE value of every month in 2003 was the highest in May and June, the daily maximum was between 0.61 and 0.67 mg · CO2 · m · 2 · s · 1, and the summer peaked in July In summer, the NEE value is about two-thirds of that in May-June, and the maximum value is 0.40mgCO2 · m-2 · s-1. Due to the continuous drought in late autumn to winter, NEE is the lowest in the whole year and the maximum in Japan The estimated carbon budget for the whole year is between 0.553 and 0.645 kgC m 2.