Laboratory of Coastal Wetland Ecology, Key Laboratory of Coastal Environment Processes, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, Shandong, 264003, PR China.
Environ Sci Technol. 2010 Jun 1;44(11):4122-8. doi: 10.1021/es100380m.
Nitric oxide (NO) is an important component in nitrogen biogeochemical cycling produced through biological processes of nitrification and denitrification in soils, but the production and the consumption processes of NO in temperate mountain soil are less understood. Through laboratory experiments focusing on NO biogenic emissions from six kinds of mountain soils sampled from different vertical landscape zones, that is, coniferous and broadleaf mixed forest (CBF), fir forest (FF), spruce forest (SF), Erman's birch forest (EBF), alpine tundra (AT), and volcanic ash (VA), in the Changbai Mountains, northeastern China, we found that the optimum water-filled pore space (WFPS) for NO production varies between 22.5% and 35% for a range of mountain soils. The optimum soil moisture for the maximum NO emission for a certain soil type, however, was constant and independent of soil temperature. The NO emission potential for forest soils was about 7-50-fold higher than tundra soil and volcanic ash, indicating that it is strongly influenced by nutrient contents in soils. On the basis of laboratory results and field monitoring data, the average NO fluxes from these mountain soils were estimated to be 0.14-29.56 ng N m(-2) s(-1) for an entire plant growth period. NO emissions mainly occur in wet season for CBF and FF, but in dry season for other soil types.
一氧化氮（NO）是氮生物地球化学循环中的一个重要组成部分，它通过土壤中的硝化和反硝化生物过程产生，但在温带山地土壤中，NO 的产生和消耗过程还不太了解。通过对中国长白山不同垂直景观带（包括针阔混交林（CBF）、冷杉林（FF）、云杉林（SF）、岳桦林（EBF）、高山冻原（AT）和火山灰（VA））采集的六种山地土壤中从生物产生的一氧化氮排放的实验室实验，我们发现，NO 产生的最佳水饱和孔隙空间（WFPS）在 22.5%到 35%之间变化。对于某种土壤类型，最大 NO 排放的最佳土壤湿度是恒定的，与土壤温度无关。森林土壤的 NO 排放潜力约为冻原和火山灰的 7-50 倍，这表明它受到土壤养分含量的强烈影响。基于实验室结果和野外监测数据，我们估计这些山地土壤在整个植物生长期间的平均 NO 通量为 0.14-29.56 ng N m(-2) s(-1)。NO 排放主要发生在 CBF 和 FF 的湿润季节，但在其他土壤类型的干燥季节。
