广西红树林净生态系统碳交换变化特征及影响因子研究

doi:10.19741/j.issn.1673-4831.2020.0779

摘要/Abstract

摘要： 为了研究广西红树林CO₂通量变化特征及其调控机制，利用2019年北海红树林生态观测试验站涡度相关系统观测的红树林碳通量和气象观测数据，分析红树林净生态系统碳交换变化特征及其与气象因子的响应关系。结果表明，广西红树林净生态系统碳交换的平均日变化曲线呈"U"型分布；在月尺度上，碳汇峰值出现在2月，最小值出现在6月；在季尺度上，不同季节碳汇峰值呈秋季 > 春季 > 冬季 > 夏季的趋势；净生态系统碳交换月累积最大值为11月（-45.23 g·m^-2·月^-1），最小值为7月（-16.95 g·m^-2·月^-1）；广西红树林净生态系统碳交换、总呼吸和总初级生产力年累积量分别为-386.68、862.49和-1 249.18 g·m^-2·a^-1，3者均低于福建和广东红树林；光合有效辐射是对净生态系统碳交换产生直接影响的主导因子，饱和水气压差是对净生态系统碳交换产生间接影响的主导因子，降水量是净生态系统碳交换的限制因子。

Abstract: In order to explore the dynamics of CO₂ flux exchange and its regulating mechanism of mangrove in Guangxi, the CO₂ flux data and the meteorological data of sandy mangrove recorded by the eddy covariance system at the mangrove ecological observation and experiment station in Beihai in 2019 were utilized to analyze the dynamics of net ecosystem carbon exchange (NEE) and its response to meteorological factors. The results suggest that the diurnal variation of NEE on average followed a U-shape pattern in Guangxi. The carbon sink reached the maximum in February and the minimum in June on the monthly scale. On the seasonal scale, the maximum NEE occurred in autumn, followed by spring, winter, and summer. The cumulative monthly NEE reached the maximum of -45.23 g·m^-2·mon^-1 in November and the minimum of -16.95 g·m^-2·mon^-1 in July. The total amount of NEE, ecosystem respiration, and gross primary productivity (GPP) were -386.68, 862.49, and -1 249.18 g·m^-2·a^-1, respectively, which were lower than that in the mixed mangrove in Fujian and Guangdong. The dominant factor of direct influence on the net ecosystem exchange was the photosynthetically active radiation, and that of indirect influence was vapor pressure deficit. Precipitation was the limiting factor of net ecosystem exchange.

Key words: Guangxi, mangrove, eddy covariance system, net ecosystem exchange, influencing factor

中图分类号:

孙明, 莫伟华, 谢敏, 陈燕丽, 潘良浩. 广西红树林净生态系统碳交换变化特征及影响因子研究[J]. 生态与农村环境学报, 2021, 37(7): 909-916.

SUN Ming, MO Wei-hua, XIE Min, CHEN Yan-li, PAN Liang-hao. Characteristics of Net Ecosystem Carbon Exchange and Its Influence Factors over the Mangrove in Guangxi[J]. Journal of Ecology and Rural Environment, 2021, 37(7): 909-916.

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