南京林业大学学报（自然科学版）2026，Vol.50Issue(1)：142-149,8.DOI:10.12302/j.issn.1000-2006.202407005
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
Temporal effects of thinning on soil methane flux of pine-oak mixed forests in Qinling Mountains
摘要
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(5a),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(5a).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分类
农业科技引用本文复制引用
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..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):142-149,8.基金项目
国家自然科学基金项目(32071763) （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). （XBY-KJCX-2021-15）
