Zhang Yue, Mu Chang Cheng, Liu Hui, Jing Li Jie
Center for Ecological Research, Northeast Forestry University, Harbin 150040, China.
Ying Yong Sheng Tai Xue Bao. 2018 Jul;29(7):2183-2194. doi: 10.13287/j.1001-9332.201807.028.
Non-growing season soil greenhouse gas emission may play an important role in the forest ecosystem carbon and nitrogen cycle. However, it is not clear about the effects of the cutting distur-bance on soil greenhouse gas emissions during non-growing season. The CO, CH and NO fluxes and related environmental factors (soil temperature, water content, carbon and nitrogen, etc.) were monitored in the Korean pine plantation (fifty year-old) under different light-felling manners (control, no cutting; the half light-felling, cutting 50% of broad-leaved trees in canopy; the whole light-felling, cutting 100% of broad-leaved trees in canopy), using static chamber technique and gas chromatography during non-growing season in Maoer Mountains of China. The main aim was to reveal the influence of cutting disturbance on soil greenhouse gases emission during non-growing season and its controlling factors. The results showed that the whole and half light-felling manners significantly decreased COemission flux by 21.0% and 22.8%, and NO by 23.5% and 11.2%, and decreased CHuptake by 16.0% and 16.4%. The contribution of non-growing season CO, CH and NO emission to annual total was 11.7%-14.2%, 13.1%-17.0% and 63.9%-72.6%, respectively. Light-felling manners decreased annual cumulative contribution of CO by 1.4%-2.5%, that of CH by 0.7%-3.9%, but increased that of NO by 2.4%-8.7%. Furthermore, light-felling increased the correlations of soil CO fluxes with soil temperature, soil water content, nitrate and ammonium, and decreased its correlation with soil organic carbon content. Light-felling increased the correlations of soil CH flux with soil water content, soil pH, soil organic carbon, ammonium, and decreased its correlation with nitrate. Light-felling increased the correlations between soil NO flux and soil temperature, decreased the correlations with nitrate and ammonium, and changed the positive correlation with soil pH to negative. Therefore, light-felling had significant effects on the emission fluxes of the greenhouse gas during non-growing season, with the whole light-felling decreased more soil NO emission flux than the half light-felling.
非生长季土壤温室气体排放可能在森林生态系统碳氮循环中发挥重要作用。然而，目前尚不清楚采伐干扰对非生长季土壤温室气体排放的影响。在中国帽儿山地区，采用静态箱法和气相色谱法，对不同轻度采伐方式（对照，不采伐；半强度采伐，采伐林冠层50%的阔叶树；全强度采伐，采伐林冠层100%的阔叶树）下的50年生红松人工林非生长季CO₂、CH₄和N₂O通量及相关环境因子（土壤温度、含水量、碳和氮等）进行了监测。主要目的是揭示采伐干扰对非生长季土壤温室气体排放的影响及其控制因素。结果表明，全强度和半强度采伐方式显著降低了CO₂排放通量，分别降低了21.0%和22.8%，N₂O排放通量分别降低了23.5%和11.2%，CH₄吸收量分别降低了16.0%和16.4%。非生长季CO₂、CH₄和N₂O排放对年总量的贡献分别为11.7%-14.2%、13.1%-17.0%和63.9%-72.6%。采伐方式使CO₂年累积贡献降低了1.4%-2.5%，CH₄年累积贡献降低了0.7%-3.9%，但使N₂O年累积贡献增加了2.4%-8.7%。此外，采伐增加了土壤CO₂通量与土壤温度、土壤含水量、硝态氮和铵态氮的相关性，降低了其与土壤有机碳含量的相关性。采伐增加了土壤CH₄通量与土壤含水量、土壤pH值、土壤有机碳、铵态氮的相关性，降低了其与硝态氮的相关性。采伐增加了土壤N₂O通量与土壤温度的相关性，降低了其与硝态氮和铵态氮的相关性，并将其与土壤pH值的正相关变为负相关。因此，采伐对非生长季温室气体排放通量有显著影响，全强度采伐比半强度采伐降低更多的土壤N₂O排放通量。
