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海南岛红树林生态系统总初级生产力分布格局及形成机制 |
郑尹齐1,2,3,史娴3,4,陈权3,5,乌兰3,5,崔嵬6,王文梅1,2,孙仲益3,5,*,谭珂7*
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1.海南省海洋地质资源与环境重点实验室,海口 570206;2.海南省生态环境地质调查院,海口 570206;3.海南大学 生态与环境学院,海口 570203;4.黑龙江大学 水利电力学院,哈尔滨 150006;5.海南省农林环境过程与生态调控重点实验室,海口 570228;6.国家林业与草原局发展研究中心,北京 100714;7.广西壮族自治区中国科学院广西植物研究所 广西喀斯特植物保育与恢复生态学重点实验室,广西 桂林 541006
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摘要: |
红树林具有较高的光合速率和较低的光补偿点,表现出较高的总初级生产力(gross primary production,GPP),是“蓝碳”重要组成。准确估算区域红树林生态系统GPP并量化其限制因素贡献对我国实现“双碳”目标具有重要意义。该文利用Sentinel-2影像和环境因子数据,基于红树植被光合作用光利用效率模型估算了2016—2020年海南岛红树林生态系统GPP,并探究其时空分布格局及形成机制。结果表明:(1)研究期间内,海南岛红树林生态系统年GPP呈现出增长趋势,东部高于西部,北部高于南部;(2)在形成机制上,海南岛红树林生态系统GPP时空分布格局受到多气象因素综合影响,年内季节性上GPP在“旱→雨”过渡期随着空气温度(air temperature,Tair)的限制降低、光合有效辐射(photosynthetically active radiation,PAR)与海水温度的促进作用,展现出较高的GPP;旱季中期Tair低,对GPP限制严重,但随着纬度的降低,Tair限制的程度被减弱;雨季则由于较高的云覆盖,使得PAR成为GPP的限制因素。该研究结果为评估区域红树林对于全球碳循环的贡献提供基础数据,为揭示影响红树林生态系统碳动态的关键环境因素提供理论支撑。 |
关键词: MVP-LUE模型,哨兵影像,时空分布格局,限制因子,红树林生态系统,海南岛 |
DOI:10.11931/guihaia.gxzw202311022 |
分类号: |
基金项目:海南省重点研发计划项目(ZDYF2022SHFZ111);海南省自然科学基金高层次人才项目(322RC580,422RC594);海南省海洋地质资源与环境重点实验室开放基金(23-HNHYDZZYHJKF035)。 |
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Spatiotemporal patterns of gross primary production of mangrove ecosystems in Hainan Island and their driving mechanisms |
ZHENG Yinqi1,2,3, SHI Xian3,4, CHEN Quan3,5, WU Lan3,5, CUI Wei6, WANG Wenmei1,2, SUN Zhongyi3,5,*, TAN Ke7*
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Abstract: |
Mangrove forests, characterized by high photosynthetic rates and low light compensation point, exhibit high Gross Primary Production (GPP), an important component of "blue carbon". Accurate estimation of regional GPP and quantification of its limiting factors are greatly significant for China to achieve its carbon neutrality goals. In this paper, we estimated the GPP of mangrove ecosystems in Hainan Island from 2016 to 2020 based on the Mangrove Vegetation Photosynthesis Light Use Efficiency (MVP-LUE) model using Sentinel-2 imagery and environmental data; and we also explored the spatiotemporal distribution pattern of GPP and its driving mechanism. The results were as follows: (1) During the study period, the annual GPP of mangrove ecosystems on Hainan Island showed an increasing trend, with higher GPP in the eastern than western regions and northern than southern regions. The mangroves distributed over a large area in northeastern Hainan Island dominate the temporal variation patterns at the whole island scale. However, distinct differences exist in the temporal dynamics across different regions of the mangrove ecosystem in Hainan Island. (2) In terms of the formation mechanism, the spatial and temporal distribution pattern of GPP of mangrove ecosystems on Hainan Island was driven by a combination of multiple meteorological factors. Seasonally within each year, during the transition from the dry season to rainy season, GPP was higher due to lower limitation from air temperature (Tair), and the promoting effects of photosynthetically active radiation (PAR) and sea surface temperature; in the middle of the dry season, low Tair imposed a serious limitation on GPP, but this Tair limitation was weakened with decreasing latitude. In the rainy season, higher cloud cover resulted in PAR becoming a limiting factor for GPP. At the end of the paper, we discussed the uncertainties and limitations of MVP-LUE, and the spatiotemporal distribution patterns of mangrove ecosystem GPP not only be constrained by environmental factors, but species composition and forest age structure can also be driving factors. The results of this study provide basic data to assess the contribution of regional mangrove forests to the global carbon cycle, and theoretical support to reveal the key environmental factors affecting mangrove ecosystem carbon dynamics. |
Key words: MVP-LUE model, Sentinel-2, spatiotemporal distribution, limiting factors, mangrove ecosystem, Hainan Island |
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