我国东部山地针阔混交林碳通量特征分析

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摘要以浙江省金华市武义县大毛尖山为研究区域,开展复杂山地森林生态系统碳汇能力的观测研究,并利用涡动相关法在 2022 年 6 月~2023 年 5 月进行观测,经过数据质量控制和质量评价分析,得到 42%的优质 CO₂ 通量数据.结果表明,大毛尖山周边以针阔混交林为主,能量闭合度为 0.89,能够很好的代表站点通量情况.CO₂ 通量在日尺度上均表现为 U 型变化,范围为-1.20~0.89mgCO₂/(m²·s).四季碳汇能力强弱依次为,夏季、春季、秋季、冬季;各月份净生态系统碳交换量(NEE)均为负值,整体表现为碳汇.CO₂ 通量与气象因子中的空气温度呈负相关,相对湿度和平均风速正相关,夜间因呼吸作用产生的 CO₂ 通量与土壤温度正相关.本研究初步解释了大毛尖山森林生态系统的碳汇特征.

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	孙彦坤
	张胤洲
	姚维杰
	叶京
	张峻搏
	潘小乐
	刘兰忠
	王自发
	程雪玲

关键词 ： CO₂ 通量, 涡动相关法(EC), 净生态系统碳交换量(NEE), 森林生态系统, 复杂地形

Abstract：This study explored the carbon sink capacity of the complex mountainous forest ecosystem around the Damaojian Mountain in Wuyi County, Jinhua, Zhejiang Province. Utilizing the eddy covariance method, CO₂ fluxes were monitored from June 2022 through May 2023. After rigorous data quality control and analysis, 42% of the data were identified as high-quality CO₂ flux measurements. The study draws the following conclusions: This area, primarily composed of mixed coniferous and broad-leaved forests with an energy closure rate of 0.89, effectively represents the flux conditions of the site. The CO₂ flux exhibited a U-shaped daily variation, with fluctuations ranging from -1.20 to 0.89mg CO₂/(m²·s). An analysis of the seasonal carbon sink capacity revealed the strongest absorption in summer, followed by spring, autumn, and winter, with the net ecosystem carbon exchange (NEE) demonstrating a consistent carbon sink effect month-over-month. The analysis highlighted a negative correlation between CO₂ flux and air temperature, whereas both relative humidity and average wind speed positively influenced the CO₂ flux. Nighttime respiration-induced CO₂ flux also showed a positive correlation with soil temperature. Overall, we have preliminarily explained the unique carbon sink features of the Damaojian Mountain forest ecosystem.

Key words： CO₂ flux eddy covariance net ecosystem carbon exchange forest ecosystem complex terrain

收稿日期: 2023-11-13

PACS:

X24

基金资助:国家自然科学基金资助项目(42177092)

通讯作者: 程雪玲,研究员,chengxl@mail.iap.ac.cn E-mail: chengxl@mail.iap.ac.cn

作者简介: 孙彦坤(1966-),男,黑龙江伊春人,教授,博士,主要从事农业生态与气候变化研究.发表论文100余篇.yk_sun@163.com.

引用本文:

孙彦坤, 张胤洲, 姚维杰, 叶京, 张峻搏, 潘小乐, 刘兰忠, 王自发, 程雪玲. 我国东部山地针阔混交林碳通量特征分析[J]. 中国环境科学, 2024, 44(6): 3492-3501. SUN Yan-kun, ZHANG Yin-zhou, YAO Wei-jie, YE jing, ZHANG Jun-bo, PAN Xiao-le, LIU Lan-zhong, WANG Zi-fa, CHENG Xue-ling. Characteristics of carbon flux in mixed coniferous and broad-leaved forests in the mountainous areas of Eastern China. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(6): 3492-3501.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2024/V44/I6/3492

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