| 基于漂浮箱法和扩散模型法测定淡水养殖鱼塘甲烷排放通量的比较 |
| 摘要点击 1800 全文点击 915 投稿时间：2019-05-14 修订日期：2019-09-10 |
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| 中文关键词 甲烷 通量 养殖鱼塘 漂浮箱法 扩散模型法 |
| 英文关键词 methane emissions fish-aquaculture pond floating chamber diffusion model |
| 作者 | 单位 | E-mail | | 胡涛 | 南京农业大学资源与环境科学学院, 南京 210095 | 15705105190@163.com | | 黄健 | 南京农业大学资源与环境科学学院, 南京 210095 | | | 丁颖 | 南京农业大学资源与环境科学学院, 南京 210095 | | | 孙志荣 | 南京农业大学资源与环境科学学院, 南京 210095 | | | 徐梦凡 | 南京农业大学资源与环境科学学院, 南京 210095 | | | 刘树伟 | 南京农业大学资源与环境科学学院, 南京 210095
江苏省有机固体废弃物资源化协同创新中心, 南京 210095 | | | 邹建文 | 南京农业大学资源与环境科学学院, 南京 210095
江苏省有机固体废弃物资源化协同创新中心, 南京 210095 | | | 吴双 | 南京农业大学资源与环境科学学院, 南京 210095
江苏省有机固体废弃物资源化协同创新中心, 南京 210095 | wushuang@njau.edu.cn |
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| 中文摘要 |
| 本研究以我国东南部地区淡水养殖鱼塘为研究对象，于2017年9月到2018年8月采用漂浮箱法和扩散模型法同步原位观测其CH4排放通量，旨在明确运用两种不同方法观测CH4的排放特征、排放强度及其驱动因子，综合比较两种方法观测结果的差异性，其中扩散模型法能够进一步量化扩散传输对CH4排放通量的贡献.结果表明，两种方法观测的CH4排放通量有相似的季节变化特征，即夏秋季排放高，冬春季排放低.通过漂浮箱法观测淡水养殖鱼塘CH4排放通量的变化范围为0.14~3.13 mg·（m2·h）-1，其年平均排放通量为（0.86±0.30）mg·（m2·h）-1，而由扩散模型法估算出鱼塘CH4排放通量变化范围为0.04~1.41 mg·（m2·h）-1，其年平均排放通量为（0.45±0.08）mg·（m2·h）-1.基于两种方法观测的CH4排放通量具有相同的环境驱动因子，CH4排放通量与水温、底泥可溶性有机碳（DOC）和水体化学需氧量（COD）呈现显著的正相关关系，与水体溶解氧（DO）呈现出极显著的负相关关系.综合比较两种方法观测结果，发现由扩散模型法估算出的淡水养殖鱼塘CH4排放通量约为漂浮箱法测定结果的45%左右（P<0.01），扩散模型法可能低估淡水养殖系统CH4排放通量.综上所述，漂浮箱法更适合用于观测我国东南部内陆地区淡水养殖生态系统CH4排放. |
| 英文摘要 |
| Freshwater aquaculture ponds collectively cover a large area in southeast China. They are an important anthropogenic source of CH4 emissions, however current knowledge of CH4 emissions from aquaculture ponds is limited. During September 2017 and August 2018, two independent sampling campaigns of CH4 flux measurements over annual cycles were carried out in a fish-aquaculture pond in southeast China using a floating chamber and diffusion model methods for comparison. The purpose of this study is to investigate the variation of CH4 fluxes obtained from the fish-aquaculture pond, analyze the emission mechanisms, and amplify the CH4 emissions inventory. The diffusion model method can further quantify the contribution of diffusion transmission to CH4 emissions. The seasonal variations of CH4 fluxes measured by the two methods were similar, with higher CH4 fluxes appearing in summer and fall and lower CH4 fluxes appearing in spring and winter. CH4 fluxes measured by the floating chamber method and diffusion model method ranged from 0.14-3.13 mg·(m2·h)-1 and 0.04-1.41 mg·(m2·h)-1, respectively, and the respective average values were (0.86±0.30) mg·(m2·h)-1and (0.45±0.08) mg·(m2·h)-1. The CH4 fluxes were positively related to water temperature, dissolved organic carbon (DOC) and chemical oxygen demand (COD), but negatively related to the water dissolved oxygen (DO) concentration in the fish-aquaculture pond. CH4 fluxes calculated by diffusion model methods were 45% lower than those determined by the floating chamber methods over annual cycles. The result suggested that the floating chamber method is more suitable than the diffusion model method for measurements of CH4 fluxes in freshwater aquaculture ecosystems. |
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