Mu Chang-Cheng, Wu Yun-Xia, Li Wan-Shu, Xu Rui
College of Forestry, Northeast Forestry University, Harbin 150040, China.
Ying Yong Sheng Tai Xue Bao. 2010 Feb;21(2):287-93.
By using static chamber and gas chromatography methods, this paper studied the effects of clear cutting and selective cutting on the CO2, CH4, and N2O emissions from Larix gmelini-Sphagnum swamp in Lesser Xing' an Mountains. Dramatic changes in the seasonal dynamics of CH4 and N2O emissions were detected in different treatment sites. Control site absorbed CH4 in summer and emitted CH4 in autumn, and absorbed N2O in both summer and autumn; selective cutting site emitted CH4 and N2O mainly in summer; and clear cutting site emitted CH4 in summer and autumn, and absorbed N2O in summer but emitted it in autumn. Cutting pattern had less effects on the seasonal dynamics of CO2 emission. Both on the clear cutting site and on the selective cutting site, the CO2 emission was in order of summer > spring > autumn. Forest cutting altered the source and sink functions of the sites. Control site functioned as a source of CO2 and a weak sink of CH4 or N2O, while forest cutting sites had a decrease of CO2 emission by 25%, and became a weak source of N2O and a weak or strong source of CH4. Compared with that of control site, the Global Warming Potential (GWP) of selective cutting site and clear cutting site was reduced by 24.5% and increased by 3.2%, respectively.
通过静态箱和气相色谱法，本文研究了皆伐和择伐对小兴安岭兴安落叶松-泥炭藓沼泽CO₂、CH₄和N₂O排放的影响。在不同处理地点检测到CH₄和N₂O排放的季节动态发生了显著变化。对照地点夏季吸收CH₄，秋季排放CH₄，夏季和秋季均吸收N₂O；择伐地点主要在夏季排放CH₄和N₂O；皆伐地点在夏季和秋季排放CH₄，夏季吸收N₂O但秋季排放N₂O。采伐方式对CO₂排放的季节动态影响较小。在皆伐地点和择伐地点，CO₂排放均为夏季＞春季＞秋季。森林采伐改变了各地点的源汇功能。对照地点作为CO₂源和CH₄或N₂O的弱汇，而森林采伐地点的CO₂排放量减少了25%，并成为N₂O的弱源和CH₄的弱源或强源。与对照地点相比，择伐地点和皆伐地点的全球变暖潜势（GWP）分别降低了24.5%和增加了3.2%。
