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首页> 外文会议>International Conference on Regional Carbon Budgets; 20060816-18; Beijing(CN) >Effects of exogenous nitrogen on methane emission from Freshwater marshes in Sanjiang Plain northeast China
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Effects of exogenous nitrogen on methane emission from Freshwater marshes in Sanjiang Plain northeast China

机译：外源氮对东北三江平原淡水沼气甲烷排放的影响

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Nutrient enrichment may impact the greenhouse gas emission from wetlands. For northeast China Sanjiang Plain marshes, enrichment by nitrogen from agriculture runoff and atmospheric deposition are thought to contribute to increasing the greenhouse gas emission, especially methane emission. We discussed this question using a field fertilization experiment to simulate the exogenous N input in freshwater marshes. Methane dynamics were studied in the Sanjiang Plain mire wetland experiment station using the static chamber technique. Nitrogen were applied at a rate of 0 (control), 60 (low nitrogen), 120 (medial nitrogen), 240 (high nitrogen) kg N hm~(-2) during the whole growing season. The maximum value of CH4 flux is 3.67mg CH_4 m~(-2) h~(-1) in the control treatment which appears at about 157 day of year, while the low and medial nitrogen treatment maximum value appears at about 159 day of year which is 11.01 mg CH_4 m~(-2) h~(-1) and 11.28 mg CH_4 m~(-2) h~(-1) respectively, the high nitrogen treatment maximum value is 5.82 mg CH_4 m~(-2) h~(-1) which appears at about 166 day of year. The nitrogen fertilization significantly increased the mean seasonal CH_4 emissions rate by 181% (low nitrogen level, P < 0.01), 254% (medial nitrogen level, P < 0.01) and 155% (high nitrogen level, P < 0.01) compared with control. The accelerating effect of different nitrogen applying rates on the CH_4 emission is related to the plant growing stages and the microbial activity of CH_4-producing and oxidizing.
机译：营养富集可能影响湿地的温室气体排放。对于东北三江平原沼泽，农业径流和大气沉积物中氮的富集被认为有助于增加温室气体的排放，特别是甲烷的排放。我们使用田间施肥实验来讨论这个问题，以模拟淡水沼泽中的外源氮输入。在三江平原沼泽湿地实验站使用静态室技术研究了甲烷的动力学。在整个生长季节中，氮的施用量为0（对照），60（低氮），120（中氮），240（高氮）kg N hm〜（-2）。对照处理中CH4通量的最大值为3.67mg CH_4 m〜（-2）h〜（-1），大约在每年的157天出现，而中低氮处理最大值出现在大约159天。年分别为11.01 mg CH_4 m〜（-2）h〜（-1）和11.28 mg CH_4 m〜（-2）h〜（-1），高氮处理最大值为5.82 mg CH_4 m〜（-1）- 2）h〜（-1）出现在每年的166天左右。与对照相比，施氮显着提高了季节性CH_4的平均排放率，分别提高了181％（低氮水平，P <0.01），254％（中氮水平，P <0.01）和155％（高氮水平，P <0.01）。 。不同施氮量对CH_4排放的促进作用与植物的生长阶段以及CH_4产生和氧化的微生物活性有关。

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