| 三江平原稻田CO2通量及其环境响应特征 |
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| 引用本文： | 刘栋,张彭义,王军伟.三江平原稻田CO2通量及其环境响应特征[J].中国环境科学,2006,26(6):0-0. |
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| 作者姓名： | 刘栋 张彭义 王军伟 |
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| 作者单位： | 清华大学环境科学与工程系,北京,100084 |
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| 基金项目： | 教育部跨世纪优秀人才培养计划 |
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| 摘 要： | 基于涡度相关技术,于2004年生长季对三江平原稻田CO2通量进行了观测.结果表明,CO2通量日变化特征明显;月平均的CO2通量日变化幅度很大,6～9月,夜间最大净排放通量分别为0.23,0.23,0.18,0.12mg/(m2·s);白天最大净吸收通量分别为-0.14,-0.68,-0.66,-0.22mg/(m2·s).白天CO2通量的变化与光合有效辐射明显相关,并且逐月变化.利用摩擦速度(U)的阈值进行筛选,夜间通量与温度之间无明显相关,同期观测的静态箱法结果表明,夜间通量与空气和土壤温度相关,整个生长季,生态系统从大气中吸收的C为5.30t/hm2.
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| 关 键 词： | CO2通量 涡度相关法 稻田 |
| 文章编号： | 1000-6923(2006)06-0653-04 |
| 收稿时间： | 1900-01-01; |
| 修稿时间： | 2006年3月27日 |
Photocatalytic degradation of methane under irradiation of vacuum ultraviolet light |
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| LIU Dong,ZHANG Peng-yi,WANG Jun-wei.Photocatalytic degradation of methane under irradiation of vacuum ultraviolet light[J].China Environmental Science,2006,26(6):0-0. |
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| Authors: | LIU Dong ZHANG Peng-yi WANG Jun-wei |
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| Abstract: | The photocatalytic degradation of low level methane by vacuum ultraviolet(TiO2/VUV)was investigated.The removal rate of methane by TiO2/VUV first increased and reached a maximum with increase of initial methane concentration,flux,relative humidity(RH)and then kept constant,the outlet ozone concentration hardly changed with initial methane concentration,and it decreased with increase of RH and flux.Addition of H2O2 and NOx was not favorable for the methane removal,but significantly reduced the outlet ozone concentration.Formaldehyde formed as an intermediate when methane degraded by TiO2/VUV,its yield was less than 0.5% and decreased with increase of RH.The removal effect of TiO2/VUV on methane was much higher than vacuum ultraviolet(VUV). |
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| Keywords: | vacuum ultraviolet photocatalysis methane indoor air |
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