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中国东南部三条富营养化河流N2O溶存浓度及释放通量的季节与昼夜变化(英文) 总被引:1,自引:0,他引:1
This study was performed at three eutrophic rivers in Southeast China aiming to determine the magnitude and patterns of dissolved N2O concentrations and fluxes over a seasonal (in 2009) and diurnal (24 h) temporal scale.The results showed that N2O concentrations varied from 0.28 to 0.38 (mean 0.32±0.04),0.29 to 0.46 (mean 0.37±0.07),and 2.07 to 3.47 (mean 2.84±0.63) μg N-N2O L-1 in the Fengle,Hangbu and Nanfei rivers,respectively,in the diurnal study performed during the summer of 2008.The study found that mean N2O concentration and estimated N2O flux (67.89 ± 6.71 μg N-N2O m-2 h-1) measured from the Nanfei River with serious urban wastewater pollution was significantly higher than those from the Fengle and the Hangbu Rivers with agricultural runoff.In addition,the seasonal study during June and December of 2009 also showed that the mean N2O concentration (10.59±14.67 μg N-N2O L-1) and flux (236.87±449.74 μg N-N2O m-2 h-1) observed from the Nanfei River were significantly higher than those from the other two rivers.Our study demonstrated both N2O concentrations and fluxes exhibited seasonal and diurnal fluctuations.Over three consecutive days during the summer of 2008,N2O accumulation rates varied within the range of 3.91-7.21,2.76-15.71,and 3.23-30.03 μg N-N2O m-2 h-1 for the Fengle,Hangbu and Nanfei Rivers,respectively,and exponentially decreased with time. 相似文献
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作为绿色消费的生态旅游已经迅速普及到全球,我国的生态旅游业也迅速发展起来,但在其开发中面临如何丰富、深化其内涵的问题。针对山区丰富的花卉资源花色斑斓、千姿百态、四季花开不断等特点,对其在发展生态旅游中的造景功能、审美价值、历史文化价值、生态价值以及旅游品牌开发价值等方面进行了讨论。 相似文献
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