抚育间伐对秦岭南坡锐齿栎天然次生林碳密度的影响  

Effects of forest thinning on carbon density of Quercus aliena var. acuteserrata natural secondary forest on southern slope of Qinling Mountains

作　　者：武朋辉[1] 党坤良[1] 常伟[1] 李明雨[1] 

机构地区：[1]西北农林科技大学林学院,陕西杨凌712100

出　　处：《西北农林科技大学学报（自然科学版）》2016年第10期75-82,共8页Journal of Northwest A&F University(Natural Science Edition)

基　　金：林业公益性行业科研专项"秦岭天然次生公益林抚育经营关键技术研究"(201204502)

摘　　要：【目的】探索森林抚育间伐强度对秦岭南坡锐齿栎天然次生林不同碳库的影响,为秦岭林区锐齿栎林合理抚育间伐提供参考。【方法】在陕西省宁东林业局沙沟林场,按照不同坡向(阴坡和阳坡)和抚育间伐强度设置锐齿栎天然次生林标准地24块,间伐强度分别为林分蓄积量的5%,15%和25%,并设置不间伐的对照样地。通过样地调查,研究不同强度间伐3年后锐齿栎天然次生林植被层、枯落物层以及土壤层有机碳密度的变化规律。【结果】5%间伐对阳坡和阴坡乔木层碳密度均无显著影响,而阳坡15%,25%间伐的林分乔木层碳密度分别比对照低10.53%和21.00%,阴坡分别低14.91%和23.39%;阳坡5%,15%间伐的林分乔木层有机碳密度增加量分别比对照高19.03%和21.19%,而25%间伐的林分与对照无显著差异;阴坡5%间伐的林分乔木层有机碳密度增加量比对照高16.76%,而15%和25%间伐的林分均与对照无显著差异;阳坡、阴坡林下灌木和草本植物碳密度均随抚育间伐强度的增加而增大;不同抚育间伐强度对枯落物层和土壤层有机碳密度均没有显著影响;5%间伐对2个坡向的锐齿栎次生林总有机碳密度均无显著影响,15%,25%间伐分别使阳坡林分总有机碳密度降低7.10%和13.64%,使阴坡林分总有机碳密度降低8.84%和13.66%。【结论】抚育间伐在一定程度上降低了秦岭南坡锐齿栎天然次生林的碳储量,然而合理的抚育间伐强度能够提高其乔木层单位面积碳吸存量;秦岭南坡锐齿栎天然次生林在阳坡采取15%间伐强度、阴坡采取5%间伐强度短期内有利于提高林分的固碳能力。【Objective】Effects of forest thinning on carbon density of Quercus aliena var.acuteserrata natural secondary forest were analyzed to provide reference for optimal thinning in Qinling Mountains.【Method】The carbon density of different pools（tree,soil,underground vegetation and litter）of Q.aliena var.acuteserratanatural secondary forest on southern slope of Qinling Mountains was investigated with 24 experimental plots.The thinning intensities were 0%（control）,5%,15%,and 25%.After 3years of thinning,the carbon densities in vegetation layer,litter layer and soil layer were investigated.【Result】The5%thinning had no significant effect on tree carbon density on both sunny and shady slopes,15%and 25%thinning decreased the tree carbon density by 10.53% and 21.00% on sunny slope,and by 14.91% and23.39% on shady slope.The increases of organic carbon density of tree layer in 5% and 15% thinning stands were 19.03% and 21.19% higher than that of control on sunny slope.The 25%thinning treatment had no difference compared to control while 5% thinning stand had 16.76% higher increase compared to that of control on shady slope.The carbon density of underground vegetation increased with the increase of thinning intensity on both sunny and shady slopes.Thinning intensity had no significant effect on soil and litter carbon density.The 5% thinning had insignificant effects on total carbon density of ecosystem on both sunny and shady slopes.In 15% and 25%thinning plots,total carbon densities of ecosystem were decreased by 7.10% and 13.64% on sunny slope and 8.84% and 13.66% on shady slope.【Conclusion】Thinning decreased the carbon density of Q.alienavar.acuteserrata natural secondary forests on southern slope of Qinling Mountains.Carbon sequestration in tree layer might be increased by suitable thinning intensity.The suggested thinning intensity was 15%（in volume）on sunny slope and 5% on shady slope.

关 键 词：间伐强度 锐齿栎 天然次生林 碳密度 

分 类 号：S753.7[农业科学—森林经理学] S792.189[农业科学—林学]