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  • Title: [Effects of light-felling on non-growing season greenhouse gas emission from soils in Korean pine forests in Maoer Mountains, China.].
    Author: Zhang Y, Mu CC, Liu H, Jing LJ.
    Journal: Ying Yong Sheng Tai Xue Bao; 2018 Jul; 29(7):2183-2194. PubMed ID: 30039655.
    Abstract:
    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 CO2, CH4 and N2O 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 CO2emission flux by 21.0% and 22.8%, and N2O by 23.5% and 11.2%, and decreased CH4uptake by 16.0% and 16.4%. The contribution of non-growing season CO2, CH4 and N2O 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 CO2 by 1.4%-2.5%, that of CH4 by 0.7%-3.9%, but increased that of N2O by 2.4%-8.7%. Furthermore, light-felling increased the correlations of soil CO2 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 CH4 flux with soil water content, soil pH, soil organic carbon, ammonium, and decreased its correlation with nitrate. Light-felling increased the correlations between soil N2O 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 N2O emission flux than the half light-felling. 非生长季土壤温室气体排放在碳氮循环中具有重要作用,而采伐干扰对非生长季森林土壤温室气体排放具有何种影响并不明确.采用静态暗箱-气相色谱法,同步观测温带帽儿山50年生红松人工林在不同透光抚育方式下(次生林冠下栽植红松10年时设立为对照;半透光抚育: 伐除上层林木50%;全透光抚育: 伐除上层林木100%)非生长季土壤3种温室气体(CO2、CH4和N2O)排放通量及其相关环境因子(土壤温度、含水量及碳氮含量等),研究采伐干扰对非生长季森林土壤温室气体排放的影响及主控因子.结果表明: 透光抚育会降低非生长季土壤CO2、CH4和N2O的排放通量,全透光和半透光抚育显著降低了温带红松林非生长季土壤CO2排放量21.0%和22.8%,并降低CH4吸收量16.0%和16.4%,但差异不显著,全透光抚育显著降低N2O排放量23.5%,而半透光抚育降低11.2%且差异不显著.温带红松林非生长季土壤CO2、CH4和N2O的年贡献率分别为11.7%～14.2%、13.1%～17.0%和63.9%～72.6%,透光抚育降低了非生长季土壤CO2(1.4%～2.5%)和CH4(0.7%～3.9%)年贡献率,但提高了N2O年贡献率(2.4%～8.7%).透光抚育增加了CO2排放与土壤温度、含水量、硝态氮及铵态氮的相关性,降低其与有机碳的相关性,增加了CH4排放与土壤含水量、酸碱度、有机碳和铵态氮的相关性,降低其与硝态氮的相关性,增加了N2O排放与土壤温度相关性,降低其与硝态氮和铵态氮的相关性,改变了其与土壤酸碱度的正负相关关系.因此,透光抚育经营方式能够显著影响温带森林非生长季土壤温室气体排放,其中全透光抚育降低非生长季土壤N2O排放能力要强于半透光抚育.
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