干湿交替下植物单种与混种对土质覆盖层甲烷减排的影响

刘红位; 卞晓冉; 冯嵩; 张滢; 程扬健

doi:10.13205/j.hjgc.202310022

干湿交替下植物单种与混种对土质覆盖层甲烷减排的影响

doi: 10.13205/j.hjgc.202310022

刘红位^1,2,3,
卞晓冉⁴,
冯嵩^5, ,,
张滢⁶,
程扬健⁴

1. 四川省交通运输厅公路规划勘察研究设计院, 成都 610041;
2. 福州大学紫金地质与矿业学院, 福州 350108;
3. 西南交通大学土木工程学院, 成都 610031;
4. 福州大学先进制造学院, 福建晋江 362251;
5. 福州大学土木工程学院, 福州 350108;
6. 福州大学环境与安全学院, 福州 350108

基金项目:

国家自然科学基金"酸性矿区植被-矿渣覆盖层长效防渗隔氧机理及设计"（52178320）；国家自然科学基金"干湿循环下植物-膨胀土路堤水分迁移规律及胀缩变形机制"（42177120）

详细信息

作者简介:
刘红位(1987-),女,副教授,主要研究方向为环境岩土工程,垃圾填埋场覆盖层水-气运移。hliuan@connect.ust.hk

通讯作者:
冯嵩(1986-),男,研究员,主要研究方向为环境岩土工程、生态可持续屏障系统、多场多相耦合。sfengaa@connect.ust.hk

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出版历程
- 收稿日期: 2023-04-10
- 网络出版日期: 2023-12-26

EFFECTS OF METHANE EMISSION REDUCTION IN EARTHEN LANDFILL COVER BY SINGLE AND MIXED PLANT SPECIES DURING DRYING-WETTING CYCLES

1. Sichuan Highway Planning, Survey, Design and Research Institute, Chengdu 610041, China;
2. Zijin School of Geology and Mining, Fuzhou University, Fuzhou 350108, China;
3. College of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China;
4. School Advanced Manufacturing, Fuzhou University, Jinjiang 362251, China;
5. College of Civil Engineering, Fuzhou University, Fuzhou 350108, China;
6. College of Environment & Safety Engineering, Fuzhou University, Fuzhou 350108, China

摘要

摘要: 为研究干湿交替下植物单种（百慕大草）与混种（鹅掌柴和百慕大草）对土质覆盖层甲烷（CH₄）减排的影响，设计3层土质覆盖层分别由机制砂尾料混合10%膨润土层、碎石层和粉砂层组成。一共开展4次干-湿交替试验，试验期间记录植物生长、土柱各层土体含水量及气压变化规律，监测各组分气体浓度。试验结果表明：填埋气对植物生长具有胁迫作用，可导致植物叶片枯萎、光合及蒸腾速率下降；混种组的CH₄氧化能力强于单种组，单种的CH₄去除率为混种组的69%~89%；混种组与单种组土体CH₄氧化能力差值随着干湿交替次数增加而提高；4次干湿交替后，混种组与单种组CH₄氧化能力均下降，分别为第1次干旱峰值的45%与34%；植物根系提高了土体的CH₄氧化能力，根系区土体的CH₄氧化能力大于根系区外土体。该研究揭示了干湿交替下植物组合方式对土质覆盖层CH₄氧化的影响，研究结果为垃圾填埋场CH₄减排提供理论参考。
- 干湿交替 /
- 植物组合 /
- 甲烷减排 /
- 3层土质覆盖层 /
- 土柱试验
Abstract: The effects of single-species (Cynodon dactylon) and mixed-species (Schefflera and Cynodon dactylon) on methane emission reduction in landfill cover were studied under the drying-wetting cycles. Three-layer landfill cover consists of a machine-made sand tailing mixed with 10% bentonite, gravel layer and silty sand layer. A total of four drying-wetting cycle tests were conducted. Throughout these tests, measurements were taken for plant growth, soil moisture content, and gas pressure changes in each layer of soil column. Additionally, gas concentration of each component was monitored. The results demonstrate that landfill gas inhibited the plants growth, causing leaf wilting and reduced photosynthesis and transpiration rates. The mixed-species group showed a higher methane oxidation capacity, compared to the single-species group. The methane removal rate of the single-species was approximately 69%~89% of that observed in the mixed-species group. The difference in methane oxidation capacity between the mixed-species group and single-species group increased with the increase in drying-wetting cycle number. After four drying-wetting cycles, both the mixed-species and single-species group showed a decrease in methane oxidation capacity. The mixed-species group reached approximate 45% of its peak value from the first drought, while the single-species group achieved around 34% of its initial peak value. Plant roots enhanced the soil's methane oxidation capacity, and the methane oxidation capacity inside the root zone was greater than that outside the root zone. This study elucidated the influence of plant combinations on methane oxidation under drying-wetting cycles. The test results provide a solid basis for mitigating methane emissions in landfills.
- drying-wetting cycle /
- combination of plants /
- methane emission reduction /
- three-layer landfill cover /
- soil column test

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