生态环境学报2024，Vol.33Issue(5)：665-678,14.DOI:10.16258/j.cnki.1674-5906.2024.05.001
广西典型沙生红树林总初级生产力变化特征及其对气象因子的响应
Changing Characteristics of Gross Primary Production for Typical Sandy Mangrove in Guangxi and Its Response to Meteorological Factors
摘要
Abstract
Among all coastal ecosystems,mangrove is the vegetation ecosystem with the highest Gross Primary Production(GPP)per unit area.Under the global climate change,carbon cycle process is quantitatively explored.The total area of mangroves in Guangxi ranks second in China.In this study,we aimed to illuminate the GPP change characteristics of mangroves and to explore the sensitivity of GPP to meteorological factors.Our results would be helpful for understanding the carbon cycle dynamics of mangrove,assisting local policy-makers in taking initiatives to combat climate change,and providing scientific basis for conservation management and ecological restoration of mangrove.Until now,there have been few studies on mangroves GPP in Guangxi which used eddy covariance technology.This study focused on the sandy mangrove in ecological restoration area,located in Beihai,Guangxi.Using eddy covariance technology combined with canopy-based observation technology,we analyzed the monthly average daily changing characteristics,seasonal average daily changing characteristics,monthly cumulative changing characteristics,and annual cumulative changing characteristics for mangrove GPP.In addition,the response models of photosynthetically active radiation,air temperature,surface temperature at 5 cm depth,vapor pressure deficit,and rainfall to GPP at daily and monthly scales were explored using single-factor correlation analysis and multi-factor path analysis.Results showed that the daily average changing curve of GPP presented an inverted"U"shape at monthly and seasonal scales.The monthly cumulative GPP showed a"two-peak and one-trough"trend,with peaks in spring and autumn and troughs in summer.The mangrove canopy vegetation index results indicated that the troughs in summer were due to the outbreak of insect pests.The annual cumulated GPP showed a slow increasing trend,and was 1284.11,1286.67,1362.10 and 1382.19 g∙m-2∙a-1 in 2019-2022,respectively.The average annual cumulated GPP was 1328.77 g∙m-2∙a-1 from 2019 to 2022,and was significantly lower than that of the southeast coastal observation stations,resulting from the soil type,community structure and external disturbance in the study area.Photosynthetically active radiation and air temperature had the greatest direct impact on mangrove GPP,while 5 cm soil surface temperature had the greatest indirect impact on mangrove GPP.Overall,the GPP of sandy mangroves was lower than that of the southeast coastal areas.With the implementation of ecological restoration projects,the GPP increased slowly,but pests and diseases had a great impact on mangroves GPP.Thus,implementations of pest control-related projects are necessary for the improvement of the carbon sink function for mangroves.关键词
广西/生态修复区/红树林/涡度相关系统/总初级生产力/通径分析Key words
Guangxi/ecological restoration area/mangrove/eddy covariance system/gross primary production/Path analysis分类
农业科技引用本文复制引用
孙明,陈燕丽,谢敏,莫伟华,潘良浩..广西典型沙生红树林总初级生产力变化特征及其对气象因子的响应[J].生态环境学报,2024,33(5):665-678,14.基金项目
广西自然科学基金项目(2022GXNSFBA035586) （2022GXNSFBA035586）
广西气象科研计划项目(桂气科2022Z04) （桂气科2022Z04）
北海国家气候观象台开放实验室-专项课题项目(BNCO-S202302) （BNCO-S202302）
中国气象局创新发展专项(CXFZ2023J075) （CXFZ2023J075）
