华南城市近郊滩涂的二氧化碳通量

IF 4.6 Q2 MATERIALS SCIENCE, BIOMATERIALS ACS Applied Bio Materials Pub Date : 2024-07-31 DOI:10.1007/s12237-024-01405-z
Zhao Liang Chen, Shing Yip Lee
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引用次数: 0

摘要

沿海生态系统是公认的重要碳库。然而,对沿海二氧化碳通量的评估往往忽略了未植被的滩涂,尤其是城市周边地区的滩涂。本研究调查了华南最大城市之一香港的三个滩涂在夏季和冬季的总初级生产力(GPP)、净初级生产力(NPP)和总呼吸量(TR),以了解它们的二氧化碳通量。结果显示,三个潮滩的增殖生产力在冬季明显高于夏季。然而,各滩涂之间的TR没有明显的季节变化。结构方程模型用于研究三个滩涂二氧化碳通量的驱动因素。模型显示,温度和微囊底栖生物丰度被认为是增殖速度的正向驱动因素,而沉积泥含量对增殖速度有正向影响。据估计,这些滩涂的日 NPP 为 -0.853 至 0.112 g C m-2 d-1,低于全球沿海植被湿地的平均值。尽管存在一些季节和空间变化,但这些城郊滩涂可被视为弱二氧化碳源,而不是二氧化碳汇。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Carbon Dioxide Fluxes from Peri-urban Tidal Flats in South China

Coastal ecosystems are recognized as important carbon reservoirs. However, assessments of coastal carbon dioxide (CO2) fluxes often neglect unvegetated tidal flats, particularly in peri-urban areas. This study investigated the gross primary production (GPP), net primary production (NPP), and total respiration (TR) of three tidal flats in Hong Kong, one of the largest cities in South China, during both summer and winter seasons to understand their CO2 fluxes. Results showed that GPP of three tidal flats was significantly higher in winter than in summer. However, no significant seasonal variations in TR were observed among the tidal flats. Structural equation modelling was used to examine the drivers of CO2 fluxes in the three tidal flats. The model showed that temperature and microphytobenthos abundance were identified as positive drivers of GPP, while sediment mud content had a positive effect on TR. The estimated daily NPP of these tidal flats ranged from -0.853 to 0.112 g C m−2 d−1, which is lower than the mean value reported for global vegetated coastal wetlands. Despite some seasonal and spatial variations, those peri-urban tidal flats may be considered as weak CO2 sources rather than CO2 sinks.

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来源期刊
ACS Applied Bio Materials
ACS Applied Bio Materials Chemistry-Chemistry (all)
CiteScore
9.40
自引率
2.10%
发文量
464
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