СО2 and СН4 Fluxes in Wetland Ecosystems of the Mezquital Valley, Central Mexico

IF 1.4 4区农林科学 Q4 SOIL SCIENCE Eurasian Soil Science Pub Date : 2024-07-30 DOI:10.1134/s106422932460129x

N. E. García-Calderón, E. Fuentes-Romero, E. Ikkonen, V. Sidorova

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Abstract

We measured dark CO₂ fluxes and CH₄ emissions from two naturally vegetated ecosystems of the Mezquital Valley irrigated with wastewater from Mexico City. The ecosystems were characterized by high groundwater levels; the vegetation was represented mainly by saltgrass in the first plot and chairmaker’s bulrush in the second. A dark chamber technique was used for the study from August 2008 to June 2009. For the two studied plots, mean values (mean ± SE) for dark ecosystem CO₂ fluxes (R_tot), soil CO₂ emission (R_soil), and heterotrophic respiration (R_het) were 26 ± 5, 14 ± 3 and 12 ± 3 mg C m^–2 h^–1, respectively, The annual cumulative fluxes R_tot, R_soil and R_het equal to 234, 127 and 103 g C m^–2 y^–1, respectively. The contribution of R_soil to R_tot, and R_het to R_soil varied significantly over the study period, with no clear relationship to seasonal dynamics. The observed low CO₂ fluxes may be due to soil salinization resulting from wastewater flooding. The fluxes of CH₄ were observed in the flooded plot, with peaks up to 370 µg C m^–2 h^–1. The fluxes of CH₄ were significantly higher when plants were present in the measurement chamber than when there were no plants, confirming the important role of plant cover in CH₄ transport. Unlike CH₄ fluxes, CO₂ fluxes show seasonal dynamics, mainly due to their strong dependence on temperature. The observed results may be useful for properly estimating the global C budget and the contribution of saline soils to C fluxes.

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墨西哥中部梅兹基塔河谷湿地生态系统中的СО2 和СН4 流量

摘要我们测量了墨西哥城废水灌溉的梅兹基塔山谷两个天然植被生态系统的暗二氧化碳通量和甲烷排放量。这两个生态系统的特点是地下水位较高；第一个地块的植被主要是盐生禾本科植物，第二个地块的植被主要是椅子草。研究采用暗室技术，时间为 2008 年 8 月至 2009 年 6 月。在两个研究地块中，暗生态系统二氧化碳通量（Rtot）、土壤二氧化碳排放量（Rsoil）和异养呼吸作用（Rhet）的平均值（平均值 ± SE）分别为 26 ± 5、14 ± 3 和 12 ± 3 mg C m-2 h-1，年累计通量 Rtot、Rsoil 和 Rhet 分别为 234、127 和 103 g C m-2 y-1。在研究期间，Rsoil 对 Rtot 的贡献率和 Rhet 对 Rsoil 的贡献率变化很大，与季节动态没有明显关系。观测到的二氧化碳通量较低可能是由于废水淹没导致土壤盐碱化造成的。在淹没地块中观察到了 CH4 通量，峰值高达 370 µg C m-2 h-1。测量室内有植物时，CH4 通量明显高于没有植物时，这证实了植物覆盖在 CH4 迁移中的重要作用。与甲烷通量不同，二氧化碳通量呈现季节性动态变化，这主要是由于二氧化碳通量与温度密切相关。观测结果可能有助于正确估计全球碳通量预算和盐碱地对碳通量的贡献。

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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来源期刊

Eurasian Soil Science 农林科学-土壤科学

CiteScore

2.70

自引率

35.70%

发文量

137

审稿时长

12-24 weeks

期刊介绍： Eurasian Soil Science publishes original research papers on global and regional studies discussing both theoretical and experimental problems of genesis, geography, physics, chemistry, biology, fertility, management, conservation, and remediation of soils. Special sections are devoted to current news in the life of the International and Russian soil science societies and to the history of soil sciences. Since 2000, the journal Agricultural Chemistry, the English version of the journal of the Russian Academy of Sciences Agrokhimiya, has been merged into the journal Eurasian Soil Science and is no longer published as a separate title.