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Characteristics of CO2 Flux in a Chinese Fir Plantation Ecosystem in Huitong County, Hunan Province

湖南会同杉木人工林生态系统CO2通量特征


利用开路式涡动相关系统与自动气象梯度观测系统2008年12个月的观测数据,研究会同13年生杉木人工林CO2通量特征。结果表明: 13年生杉木人工林生态系统CO2通量日变化存在明显的季节差异,晴天平均碳汇持续时间表现为夏>春>秋>冬,平均日较差表现为夏>秋>春>冬,最大碳汇出现时间由早到晚依次为夏、秋、春和冬; 1年中,月累积碳通量除1和2月为碳源外,其他各月均表现为碳汇,碳汇最大值出现在6月(-53.0 g C·m-2); 13年生杉木林的年碳汇总量为-255.3 g C·m-2。白天CO2通量与光合有效辐射的关系可用Michaelis-Menten模型模拟(P<0.05),但模型参数随温度而异; 夜间CO2通量与5 cm土壤温度呈指数关系(P<0.05)。

Characteristics of CO2 flux were investigated by using the data collected from an open path eddy covariance system and an automatic weather gradient system in a 13-year-old Chinese fir plantation ecosystem in Huitong County, Hunan Province, in 2008. The results showed that there were pronounced diurnal and annual variations in CO2 flux in the Chinese fir plantation. In clear days, mean duration of negative CO2 fluxes decreased from summer, spring, autumn to winter, and the biggest mean daily carbon dioxide flux range and the earliest time of the average minimum carbon dioxide appeared in summer, followed by autumn, spring and winter. The Chinese fir plantation ecosystem had a negative monthly CO2 flux that acted as a carbon sink except for January and February. The minimum accumulated monthly net carbon ecosystem exchange (maximum carbon sink) was -53.0 g C·m-2 occurred in June. The annual net carbon ecosystem exchange amounted to -255.3 g C·m-2. The CO2 flux was closely related to several meteorological factors including photosynthetic active radiation, air temperature and soil temperature. The Michaelis-Menten model could be used to express the relationship between CO2 flux and photosynthetic active radiation in daytime, however the model parameters varied apparently with different temperatures (P<0.05). The CO2 flux at night showed an exponential relationship with soil temperature at 5 cm depth(P<0.05).


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