Seasonal and inter-annual variation of CO2 flux between a temperate forest and the atmosphere in Japan

IF 2.3 4区地球科学 Q3 METEOROLOGY & ATMOSPHERIC SCIENCES

Tellus Series B-Chemical and Physical Meteorology Pub Date : 1999-04-01 DOI:10.3402/TELLUSB.V51I2.16314

S. Yamamoto, S. Murayama, N. Saigusa, H. Kondo

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引用次数: 109

Abstract

The objective of this research is to elucidate the seasonal and inter-annual variations of CO 2 exchanges between the atmosphere and a temperate deciduous forest in Japan and to elucidate their relation to meteorological conditions. The uptake rates of CO 2 from October 1993 to December 1996 were estimated from field measurements of CO 2 concentrations and meteorological conditions using a tower. Net of uptake rate of CO 2 was positive (uptake by forest ecosystems) from June to September and negative (release to the air) from October to April. Averages of integrated uptake rates of CO 2 were 840, − 450 and 390 gCO 2 /m 2 /year (2.3, − 1.2 and 1.1 tC/ha/year) for daytime, night and whole day (net), but they had notable inter-annual variation due to the differences of averaged insolation and temperature each summer of 1994 to 1996. The errors of CO 2 flux due to topographical conditions were investigated through comparison with heat budgets. CO 2 uptake rate estimated by tower measurement might be underestimation of 40%, therefore, above net-uptake value, 1.1 tC/ha/year became 1.8. This value of uptake rate was smaller than the results obtained in other temperate deciduous forests. The causes of this are partially in the difference of the height of the site and the short active period of the present forest. According to the CO 2 flux measurements in several forests including the present one, the forest ecosystems could be a large sink of CO 2 , however, more data of the CO 2 flux is needed at the various forests and latitudes to reduce the uncertainty of estimation of CO 2 uptake on a global scale. DOI: 10.1034/j.1600-0889.1999.00020.x

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日本温带森林与大气间CO2通量的季节和年际变化

本研究的目的是阐明日本温带落叶森林与大气之间co2交换的季节和年际变化及其与气象条件的关系。从1993年10月至1996年12月的二氧化碳吸收率是根据实地测量的二氧化碳浓度和利用一个塔的气象条件估计的。co2净吸收率6 - 9月为正(森林生态系统吸收)，10 - 4月为负(向空气释放)。白天、夜间和白天(净)的co2综合吸收率平均值分别为840、- 450和390 gCO 2 / m2 /年(2.3、- 1.2和1.1 tC/ha/年)，但由于1994 ~ 1996年夏季平均日晒和温度的差异，其年际变化显著。通过与热收支的比较，探讨了地形条件对co2通量的影响。通过塔测量估计的co2吸收率可能被低估了40%，因此，高于净吸收率的1.1 tC/ha/年变为1.8 tC/ha/年。这一吸收速率值小于其他温带落叶林中的结果。造成这种情况的部分原因是场地高度的差异和现在森林的活跃期较短。根据包括本森林在内的几种森林的CO 2通量测量，森林生态系统可能是CO 2的一个大汇，但是，为了减少在全球尺度上估算CO 2吸收量的不确定性，需要更多不同森林和纬度的CO 2通量数据。DOI: 10.1034 / j.1600-0889.1999.00020.x

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来源期刊

Tellus Series B-Chemical and Physical Meteorology 地学-气象与大气科学

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期刊介绍： Tellus B: Chemical and Physical Meteorology along with its sister journal Tellus A: Dynamic Meteorology and Oceanography, are the international, peer-reviewed journals of the International Meteorological Institute in Stockholm, an independent non-for-profit body integrated into the Department of Meteorology at the Faculty of Sciences of Stockholm University, Sweden. Aiming to promote the exchange of knowledge about meteorology from across a range of scientific sub-disciplines, the two journals serve an international community of researchers, policy makers, managers, media and the general public.