Ecosystem-atmosphere exchange of CH4 and N2O and ecosystem respiration in wetlands in the Sanjiang Plain, Northeastern China
Ecosystem-atmosphere exchange of CH4 and N2O and ecosystem respiration in wetlands in the Sanjiang Plain, Northeastern China
复制标题
东北三江平原湿地CH4、N2O生态系统-大气交换及生态系统呼吸
DOI：
10.1111/j.1365-2486.2008.01821.x
复制
发表时间：
2009-03-01
影响因子：
11.6
通讯作者：
Wang, Yiyong
中科院分区：
文献类型：
--
作者：
Song, Changchun;Xu, Xiaofeng;Wang, Yiyong
天然湿地对全球变化至关重要，因为它们在调节大气中CO2，CH 4和N2 O浓度方面发挥着重要作用。通过对三江平原3个湿地生态系统CH 4和N2 O与大气交换以及生态系统呼吸的连续4年观测，研究了不同湿地生态系统CH 4和N2 O的交换特征。2002 - 2005年，永久淹没湿地CH 4、N2 O和生态系统呼吸的年平均收支分别为39.40 +/- 6.99 gCm-2 yr（-1）、0.124 +/- 0.05 gNm（-2）yr（-1）和513.55 +/- 8.58 gCm-2 yr（-1）; 4. 36 +/-1. 79 g Cm-2 yr（-1），0. 11 +/-0. 12 g Nm（-2）yr（-1），季节性淹没湿地为880. 50 +/-71. 72 g Cm-2 yr（-1）;灌木沼泽为0.21 ± 0.1 g Cm-2 yr（-1）、0.28 ± 0.11 g Nm（-2）yr（-1）和1212.83 ± 191.98 g Cm-2 yr（-1）。气体通量的显着年际变化是由于显着的气候变异性造成的，这强调了长期连续观测的重要性。气体排放的明显季节性模式与气体通量与空气温度的显著关系相关联，这意味着全球变暖对自然湿地温室气体排放的潜在影响。3种湿地类型的CH 4、N2 O通量和生态系统呼吸平衡存在较大差异，这表明以往研究中将各种天然湿地作为一种或两种功能类型处理存在不确定性。对全球自然湿地进行更细致的新分类是非常有希望的。
Natural wetlands are critically important to global change because of their role in modulating atmospheric concentrations of CO2, CH4, and N2O. One 4-year continuous observation was conducted to examine the exchanges of CH4 and N2O between three wetland ecosystems and the atmosphere as well as the ecosystem respiration in the Sanjiang Plain in Northeastern China. From 2002 to 2005, the mean annual budgets of CH4 and N2O, and ecosystem respiration were 39.40 +/- 6.99 g Cm-2 yr(-1), 0.124 +/- 0.05 g Nm(-2) yr(-1), and 513.55 +/- 8.58 g Cm-2 yr(-1) for permanently inundated wetland; 4.36 +/- 1.79 g Cm-2 yr(-1), 0.11 +/- 0.12 g Nm(-2) yr(-1), and 880.50 +/- 71.72 g Cm-2 yr(-1) for seasonally inundated wetland; and 0.21 +/- 0.1 g Cm-2 yr(-1), 0.28 +/- 0.11 g Nm(-2) yr(-1), and 1212.83 +/- 191.98 g Cm-2 yr(-1) for shrub swamp. The substantial interannual variation of gas fluxes was due to the significant climatic variability which underscores the importance of long-term continuous observations. The apparent seasonal pattern of gas emissions associated with a significant relationship of gas fluxes to air temperature implied the potential effect of global warming on greenhouse gas emissions from natural wetlands. The budgets of CH4 and N2O fluxes and ecosystem respiration were highly variable among three wetland types, which suggest the uncertainties in previous studies in which all kinds of natural wetlands were treated as one or two functional types. New classification of global natural wetlands in more detailed level is highly expected.