| 成都平原不同类型沟渠CO2、CH4和N2O排放通量特征及其影响因素 |
| 摘要点击 2723 全文点击 935 投稿时间：2017-05-02 修订日期：2017-06-15 |
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| 中文关键词 成都平原 不同类型沟渠 水-气界面通量 静态漂浮箱法 影响因素 |
| 英文关键词 Chengdu plain different types of ditches water-air interface fluxes static floating chamber influencing factors |
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| 中文摘要 |
| 为研究不同类型沟渠CH4、CO2和N2O排放通量特征及其影响因素，于2014年3月~2015年2月，以每月一次的频率，采用静态浮箱法对成都平原的农业沟渠、农业生活复合沟渠、生活沟渠的CH4、CO2和N2O排放通量进行监测.结果表明：①受人为活动的影响，研究区域中3种类型的沟渠CO2、CH4和N2O排放通量较大，变化范围分别为-2.26~1504.40 mg·（m2·h）-1、0.69~40.00 mg·（m2·h）-1、-2.27~70.35 μg·（m2·h）-1，且均表现出夏季高，冬季低的特征.②农业生活复合沟渠CO2排放通量显著高于农业沟渠和生活沟渠（P<0.05），生活沟渠CH4和N2O排放通量显著高于农业生活复合沟渠和农业沟渠（P<0.05）.③水温和降雨量是影响CO2、CH4和N2O排放通量的主要环境因子，溶解氧（dissolved oxgen，DO）和全氮（total nitrogen，TN）是影响CO2和N2O排放通量的主要水质参数；铵态氮（ammonium nitrogen，NH4+-N）与DO是影响CH4排放通量的主要水质参数. |
| 英文摘要 |
| In order to study the flux characteristics of CH4, CO2 and N2O in different ditches and their influencing factors, three types of ditches (an agricultural ditch, agricultural-living compound ditch, and living ditch) were monitored once a month from March 2014 to February 2015 using static floating chambers in the Chengdu Plain. The results showed that:① Affected by human activities, CO2, CH4, and N2O fluxes were high in ditches and ranged from -2.26-1504.40 mg·(m2·h)-1, 0.69-40.00 mg·(m2·h)-1, and -2.27-70.35 μg·(m2·h)-1,respectively. All are higher in summer compared to autumn and spring, and are lowest in winter. ② The flux of CO2 in agricultural-living compound ditches was significantly higher than that in agricultural ditches and living ditches (P<0.05), and the fluxes of CH4 and N2O in living ditches were significantly higher than those in agricultural ditches and agricultural-living compound ditches (P<0.05). ③ Water temperature and rainfall were the main environmental factors affecting CO2, CH4, and N2O fluxes, and DO (dissolved oxygen) and TN (total nitrogen) were the main environmental factors affecting CO2 and N2O fluxes. NH4+-N (ammonium nitrogen) and DO were the main water quality parameters affecting the CH4 flux. |
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