排序方式： 共有6条查询结果，搜索用时 15 毫秒
1
1.
A comparative study of rice paddies and the uncovered water field in Taoyuan(Hunan) showed that methane emission from rice-vegetated paddy fields in 1993 was different from that in 1992(I,e,lower in rates and irregular in pattern).Climate has obvious influence on methane emission .And ebullition made a considerable contribution to the total flux of methane emission from rice paddies (45%).This implies that the intensification of paddy cultivation of rice might not be,as was proposed,the main con-tributor to the observed gradual increasing of atmospheric methane.24-hour automatic measurements of atmospheric temperature,air temperature and methane concentration in the static sampling boxes revealed that temperature,in addition to fertilization and irrigation style,is one of the most important factors that control the emission of methane from rice paddies. 相似文献
2.
水体甲烷（CH4）主要通过气泡和扩散传输排放到大气，这两种途径在CH4总排放中的相对贡献及环境影响因子目前关注较少.本文以洞庭湖湿地3种生境类型（光滩、苔草、芦苇）为研究对象，通过静态箱法和扩散模型法估算洪水期CH4总排放通量、扩散排放通量和气泡排放通量，并分析其水体环境因子影响.结果表明：苔草地CH4总排放量最高，为6.49±3.12 mg（C）/（m2·h）.在3个生境中，CH4扩散排放占总排放通量的1.34%~3.91%，气泡排放占96.09%~98.66%.扩散排放通量受水体pH、电导率和水温的影响，而CH4的总排放和气泡排放主要受水温的影响.当水温低于11.7℃时，水体CH4以扩散排放为主，但当水温高于11.7℃时，水体CH4主要通过气泡排放.但这一温度阈值是否同样适用于其他类型湿地还需要更多实验验证.本研究对于揭示中低纬度内陆湖泊水体CH4排放过程有重要意义. 相似文献
3.
Nirmal Rajkumar A Barnes J Ramesh R Purvaja R Upstill-Goddard RC 《Marine pollution bulletin》2008,56(12):2043-2051
We measured dissolved N(2)O, CH(4), O(2), NH(4)(+), NO(3)(-) and NO(2)(-) on 7 transects along the polluted Adyar River-estuary, SE India and estimated N(2)O and CH(4) emissions using a gas exchange relation and a floating chamber. High NO(2)(-) implied some nitrification of a large anthropogenic NH(4)(+) pool. In the lower catchment CH(4) was maximal (6.3+/-4.3 x 10(4)nM), exceeding the ebullition threshold, whereas strong undersaturation of N(2)O and O(2) implied intense denitrification. Emissions fluxes for the whole Adyar system approximately 2.5 x 10(8) g CH(4)yr(-1) and approximately 2.4 x 10(6)gN(2)O yr(-1) estimated with a gas exchange relation and approximately 2 x 10(9) g CH(4)yr(-1) derived with a floating chamber illustrate the importance of CH(4) ebullition. An equivalent CO(2) flux approximately 1-10 x 10(10)gy r(-1) derived using global warming potentials is equivalent to total Chennai motor vehicle CO(2) emissions in one month. Studies such as this may inform more effective waste management and future compliance with international emissions agreements. 相似文献
4.
5.
José R. Romero John C. Patterson John M. Melack 《Aquatic Sciences - Research Across Boundaries》1996,58(3):210-223
A one-dimensional vertical mixing model modified for application to hypersaline Mono Lake reproduced mixed layer dynamics well but hypolimnetic heating was underestimated. One possible source of increased hypolimnetic heating is vertical mixing caused by bubble plumes of methane rising from the sediments. Estimates of vertical mixing from methane seepage in Mono Lake were made with the inclusion of a bubble plume algorithm. A methane ebullition rate three hundred times greater than the maximum estimate for Mono Lake was required to simulate the observed hypolimnetic heating. 相似文献
6.
气泡释放是天然水体中水-气交换的重要途径之一.采用改进的倒置漏斗型气泡通量监测装置于2012年3-8月期间对三峡支流澎溪河高阳平湖库湾水域进行气泡释放通量的监测研究.研究期间,研究水域CH4气泡释放通量变化范围为0.01 ～ 23288.64 μmol/(m2·d);CO2气泡释放通量变化范围为0～799.89 μmol/(m2·d).不同常规采样点CH4、CO2气泡释放通量均呈现出高度的时空异质性特征.但CH4气泡释放通量显著高于CO2气泡释放通量,且二者释放过程具有同步性.同国外已有水库监测结果相比,澎溪河回水区高阳平湖库湾水域CH4、CO2气泡释放通量位于中等水平.CH4气泡释放通量约为同期CH4扩散通量的0～ 1893.90％,超量释放下CH4气泡释放通量可达同水域CH4扩散通量的6270.5％±390.0％.CO2气泡释放通量仅占同期扩散通量绝对值的0～ 21.74‰,超量释放下,CO2气泡释放通量亦仅为同期扩散通量绝对值的40.33‰ ±0.93‰.CH4气泡释放通量在支流库湾水域对总通量的贡献不可忽视. 相似文献
1