不同间伐恢复年限对秦岭松栎混交林土壤甲烷通量的影响

王祥福, 盛启林, 李愿会, 冯思宇, 刘渤然, 马雪红, 李丽, 王荣女, 王维枫

南京林业大学学报（自然科学版） ›› 2026, Vol. 50 ›› Issue (1) : 142-149.

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南京林业大学学报（自然科学版）
PDF(1737 KB)
南京林业大学学报（自然科学版） ›› 2026, Vol. 50 ›› Issue (1) : 142-149. DOI: 10.12302/j.issn.1000-2006.202407005
研究论文

不同间伐恢复年限对秦岭松栎混交林土壤甲烷通量的影响

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Temporal effects of thinning on soil methane flux of pine-oak mixed forests in Qinling Mountains

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文章历史 +

摘要

【目的】 探究抚育间伐对秦岭松栎混交林土壤甲烷(CH4)通量的影响,为森林土壤CH4通量管理提供科学依据。【方法】以秦岭松栎混交林为研究对象,对未间伐样地(CK)、间伐5 a、间伐13 a的样地采用静态箱-气相色谱法监测土壤CH4通量,并通过单因素方差分析、重复测量的方差分析以及线性回归确定了间伐措施和环境因素如何影响土壤CH4通量的变化。【结果】与CK相比,间伐5 a样地的土壤温度(ST)升高2.73 ℃(P<0.05)。间伐13 a样地的土壤pH增大0.32,铵态氮含量显著降低(P <0.05),其他土壤理化性质在间伐前后无显著变化。间伐后不同恢复时间的林地土壤湿度(土壤含水率,SWC)、ST和土壤总磷(TP)含量发生显著变化(P <0.05):随着恢复时间延长,SWC增加10.21%,ST降低3.08 ℃,TP质量分数增加0.21 g/kg。秦岭山地森林土壤均呈现为甲烷汇,并于夏季7月出现吸收峰。间伐后林地CH4吸收呈现先增加(间伐5 a vs CK,P<0.05)后降低到未间伐水平(间伐13 a vs CK,P>0.05)的趋势。ST每增加1 ℃,土壤CH4吸收速率增加0.09~0.22 mg/(m2·d);土壤湿度每增加1%,土壤CH4吸收速率降低0.03~0.10 mg/(m2·d),且短恢复时间(5 a)的间伐有较高的湿度和温度敏感性。【结论】间伐后土壤温度升高、湿度降低,从而增强了土壤对CH4氧化的能力。随着林冠恢复,CH4吸收效应逐渐减弱,表明将间伐间隔期控制在13 a以下可维持较高的土壤甲烷汇功能。

Abstract

【Objective】 This study aims to elucidate the temporal effects of thinning on soil methane (CH4) fluxes in mixed pine-oak forests in the Qinling Mountains, providing scientific evidence for optimizing forest management strategies to regulate soil CH4 fluxes. 【Method】A chronosequence approach was adopted to examine three treatment groups: unthinned (CK), five-year post-thinning (5 a), and 13-year post-thinning (13 a). Soil CH4 fluxes were monitored monthly using the static chamber-gas chromatography approach. Statistical analyses incorporated one-way ANOVA for treatment effects, repeated measures ANOVA for temporal variations, and linear regression to identify environmental drivers.【Result】Thinning significantly modified soil properties: compare with CK, soil temperature increased by 2.73 ℃ in 5a plots (P < 0.05), while pH in 13 a plots increased 0.32 (P<0.05) and NH4+-N content in the 13 a plots decreased 2.86 mg/kg (P < 0.05). while other soil physicochemical properties before and after thinning had no significant changes. Recovery duration induced progressive changes: soil water content increased by 10.21%; soil temperature decreased by 3.08 ℃; and TP mass fraction increased by 0.21 g/kg. Seasonal CH4 flux dynamics showed peak absorption in July for all treatments. Thinning initially enhanced CH4 oxidation capacity (5 a vs CK, P < 0.05), which reverted to pre-treatment levels by 13 a (13 a vs CK, P>0.05). Regression analysis identified soil temperature and moisture as primary controls, which for every 1 ℃ increase in soil temperature, the soil CH4 uptake rate increased by 0.09-0.22 mg/(m2·d). Conversely, a 1% rise in soil moisture content reduced the CH4 uptake rate by 0.03-0.10 mg/(m2·d). Notably, stands with shorter post-thinning recovery duration (5 a) exhibited higher sensitivity to both moisture content and temperature variations. 【Conclusion】Thinning temporarily enhances soil CH4 oxidation capacity through microclimate modification, specifically via soil temperature increasing by 2.73 ℃ in early post-thinning stages (5 a). The positive effect of CH4 uptake diminishes with canopy recovery (13 a), suggesting rotational thinning interval below 13 years can could sustain soil CH4 sink functionality.

关键词

甲烷通量 / 森林抚育 / 松栎混交林 / 间伐 / 温室气体 / 土壤

Key words

methane flux / forest tending / mixed pine-oak forest / thinning / greenhouse gas / soil

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王祥福, 盛启林, 李愿会, 等. 不同间伐恢复年限对秦岭松栎混交林土壤甲烷通量的影响[J]. 南京林业大学学报（自然科学版）. 2026, 50(1): 142-149 https://doi.org/10.12302/j.issn.1000-2006.202407005
WANG Xiangfu, SHENG Qilin, LI Yuanghui, et al. Temporal effects of thinning on soil methane flux of pine-oak mixed forests in Qinling Mountains[J]. Journal of Nanjing Forestry University (Natural Sciences Edition）. 2026, 50(1): 142-149 https://doi.org/10.12302/j.issn.1000-2006.202407005
中图分类号： S718.5   

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基金

国家自然科学基金项目(32071763)
国家林业和草原局西北调查规划院2021年科技创新项目(XBY-KJCX-2021-15)

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