Study on the Seasonal Dynamic of Net Ecosystem Exchange over a Poplar Plantation of Yueyang City in Hu’nan Province

WEI Yuan; ZHANG Xu-dong; JIANG Ze-ping; ZHOU Jin-xing; TANG Yu-xi; WU Li-xun; HUANG Ling-ling; GAO Sheng-hua

Volume 23 Issue 5

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Study on the Seasonal Dynamic of Net Ecosystem Exchange over a Poplar Plantation of Yueyang City in Hu’nan Province

1.
Research Institute of Forestry, Chinese Academy of Forestry
2.
Key Laboratory of Tree Breeding and Cultivation,State Forestry Administration, Beijing 100091,China

Received Date: 2008-04-15
Accepted Date: 2010-05-16

Abstract

The dynamics in different time-scale of Net Ecosystem Exchange(NEE) in poplar forest of the Yangtze River were studied by using an eddy covariance method . The following results were obtained: Daily CO2 flux was closely related to growing stages and photosynthetic active radiation (PAR), and night CO2 flux showed an exponential regression relationship with 5 cm depth soil temperature. The CO2 flux between forest and atmosphere ranged from -2 mg·m-2·s-1 to 2 mg·m-2·s-1. As for the daily change of NEE in the growing season, it begin to absorb carbon dioxide and increase after 7:00 AM ,and keep stable from 11:00AM to 1:00 PM resulting from PAR then decrease and after 6:30PM change to discharge carbon dioxide to the atmosphere, lastly change gradually at night. The maximum uptake occurredat about 10 o’clock of local time in clear day. The NEE also had obviously seasonal variation that was mainly controlled by temperature. Remarkable uptake occurred in blooming growing season and weak respiration occurred in dormant season. Assimilation and respiration were nearly balanced during the transition of growing and dormant seasons. Poplar forests are one of carbon sinks. The annual carbon uptake of the ecosystem was -579 g·m-2 in 2006. It is in 2006 when the serious water logging happened that plantation still absorbed carbon dioxide from the atmosphere in the whole year, which shows that the poplar forest plays an important role in improving the carbon sink of terrestrial ecosystem.
- CO₂ flux,
- eddy-covariance,
- dynamic variation,
- net ecosystem exchange,
- poplar forest

References

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Study on the Seasonal Dynamic of Net Ecosystem Exchange over a Poplar Plantation of Yueyang City in Hu’nan Province

1. Research Institute of Forestry, Chinese Academy of Forestry

2. Key Laboratory of Tree Breeding and Cultivation,State Forestry Administration, Beijing 100091,China

Received Date: 2008-04-15

Accepted Date: 2010-05-16

Abstract: The dynamics in different time-scale of Net Ecosystem Exchange(NEE) in poplar forest of the Yangtze River were studied by using an eddy covariance method . The following results were obtained: Daily CO2 flux was closely related to growing stages and photosynthetic active radiation (PAR), and night CO2 flux showed an exponential regression relationship with 5 cm depth soil temperature. The CO2 flux between forest and atmosphere ranged from -2 mg·m-2·s-1 to 2 mg·m-2·s-1. As for the daily change of NEE in the growing season, it begin to absorb carbon dioxide and increase after 7:00 AM ,and keep stable from 11:00AM to 1:00 PM resulting from PAR then decrease and after 6:30PM change to discharge carbon dioxide to the atmosphere, lastly change gradually at night. The maximum uptake occurredat about 10 o’clock of local time in clear day. The NEE also had obviously seasonal variation that was mainly controlled by temperature. Remarkable uptake occurred in blooming growing season and weak respiration occurred in dormant season. Assimilation and respiration were nearly balanced during the transition of growing and dormant seasons. Poplar forests are one of carbon sinks. The annual carbon uptake of the ecosystem was -579 g·m-2 in 2006. It is in 2006 when the serious water logging happened that plantation still absorbed carbon dioxide from the atmosphere in the whole year, which shows that the poplar forest plays an important role in improving the carbon sink of terrestrial ecosystem.

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Reference (55)

[1]	李克让,陈育峰,刘世荣,等.减缓及适应全球气候变化的中国林业对策[J].地理学报,1996,5(supp.):109-119
[2]	方晰,田大伦,项文化,等.第二代杉木中幼林生态系统碳动态与平衡[J].中南林学院学报,2002,22(1):1-6
[3]	桑卫国,马克平,陈灵芝.暖温带落叶阔叶林碳循环的初步估算[J].植物生态学报,2006,26(5):543-548
[4]	梁万军,胡海清,刘富军,等.中国杨树生物量和碳储量研究进展[J].林业研究:英文版,2006,17(1):75-79
[5]	苏东凯,周永斌,唐庆华,等.不同杨树品种光合生理生态特性的研究[J].西北林学院学报,2006,21(2):39-41
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[10]	石培礼,于贵瑞.拉萨河下游河谷不同土地利用方式下土壤有机碳储量格局[J].资源科学,2003,25(5):96-102
[11]	朱强根,张焕朝,单奇华,等.苏北不同杨树人工林经营模式下土壤呼吸日变化观测与测定方法比较[J].安徽农业科学,2007,35(30):9518 - 9521
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[22]	周存宇,周国逸,张德强,等.鼎湖山森林地表CO₂通量及其影响因子的研究[J].中国科学D辑.地球科学,2004,34(增刊Ⅱ):175-182
[23]	张军辉,韩士杰,孙晓敏,等.冬季强风条件下森林冠层/大气界面开路涡动相关CO₂净交换通量的UU修正[J].中国科学D辑.地球科学,2004,34(增刊Ⅱ):77-83
[24]	朱治林,孙晓敏,袁国富,等.非平坦下垫面涡度相关通量的校正方法及其在ChinaFLUX中的应用[J].中国科学D 辑.地球科学,2004,34(增刊Ⅱ):37-45
[25]	温学发,于贵瑞,孙晓敏,等.复杂地形条件下森林植被湍流通量测定分析[J].中国科学D辑.地球科学,2004,34(增刊Ⅱ):57-66
[26]	任传友,于贵瑞,王秋凤,等.冠层尺度的生态系统光合-蒸腾耦合模型研究[J].中国科学D辑.地球科学,2004,34(增刊Ⅱ):141-151
[27]	宋霞,于贵瑞,刘允芬,等.开路与闭路涡度相关系统通量观测比较研究[J].中国科学D辑.地球科学,2004,34(增刊Ⅱ):67-76
[28]	曹明奎,于贵瑞,刘纪远,等.陆地生态系统碳循环的多尺度试验观测和跨尺度机理模拟[J].中国科学D辑.地球科学,2004,34(增刊Ⅱ):1-14
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[30]	孙晓敏,朱治林,许金萍,等.涡度相关测定中平均周期参数的确定及其影响分析[J].中国科学D辑.地球科学,2004,34(增刊Ⅱ):30-36
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[32]	于贵瑞,张雷明,孙晓敏,等.亚洲区域陆地生态系统碳通量观测研究进展[J].中国科学D辑.地球科学,2004,34(增刊Ⅱ):15-29
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Study on the Seasonal Dynamic of Net Ecosystem Exchange over a Poplar Plantation of Yueyang City in Hu’nan Province

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Study on the Seasonal Dynamic of Net Ecosystem Exchange over a Poplar Plantation of Yueyang City in Hu’nan Province

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