摘要
通过对秦岭南坡红桦林的研究,设置5个间伐区域(5%、10%、15%、20%和25%)和对照(CK),研究抚育间伐对红桦林土壤活性有机碳(轻组分有机碳、易氧化有机碳、可溶性有机碳)的影响,为秦岭南坡红桦林的科学管理提供了理论依据。结果表明:1)每个间伐强度均能提高总有机碳含量,且15%最高,为26.05 g·kg^-1;其含量在不同间伐强度的顺序为15%>20%>10%>25%>5%>CK;每个土层的总有机碳含量都可以通过间伐强度来增加。2)随着间伐强度的加大轻组分有机碳的含量会降低,不同的间伐强度下轻组分有机碳含量顺序为CK>5%>10%>15%>20%>25%;在不同间伐强度下,易氧化有机碳和总有机碳具有相同的变化规律,以间伐强度15%最高,为4.75 g·kg^-1,不同间伐强度易氧化有机碳顺序为15%>20%>25%>10%>5%>CK。间伐对表层易氧化有机碳含量有显著影响,对深层几乎无影响。间伐可提高可溶性有机碳含量,以强度20%增加最明显,为133.91 mg·kg^-1,其含量顺序为20%>15%>10%>25%>5%>CK。间伐能显著影响表层可溶性有机碳,对深层几乎无影响。3)3种活性碳占总有机碳的百分比在强度15%时均最低,分别为11.12%~34.44%、16.07%~21.15%和0.57%~0.82%。表明15%的间伐强度不仅有利于土壤总有机碳的积累,而且能提高土壤有机碳的稳定性,因此间伐强度15%可作为红桦林间伐的参考指标。
The effects of thinning on soil active organic carbon(light organic carbon,oxidized organic carbon,dissolved organic carbon) in Betula albosinensis forest were analyzed to provide a theoretical basis for planning the forest cultivation in the southern slope of Qinling Mountains.We established the intensity thinning into six categories:0(control),5%,10%,15%,20%,and 25%.The results showed that:1) the total organic carbon content of the soil increased under each thinning intensity,and the average organic carbon content of the soil within the thinning intensity of 15% was the highest(26.05 g·kg^-1);the total organic carbon content under different thinning intensity was 15%>20%>10%>25%>5%>control;each thinning intensity could increase the total organic carbon content of each soil layer.2) The light fraction organic carbon decreased with the increase of thinning intensity.The order of light fraction of soil organic carbon within different thinning intensity was control>5%>10%>15%>20%>25%.The change trend of oxidized organic carbon was the same with total organic carbon content,with the highest content of 4.75 g·kg^-1 under intensity of 15%.The order of oxidized organic carbon within different thinning soils was 15%>20%>25%>10%>5% >control.The thinning management had a great influence on the content of oxidized organic carbon in the surface soil,but had little effect on the deep layer.Thinning could increase the content of soluble organic carbon,which was most obvious with a 20% increase in strength(133.91 mg·kg^-1),and the contents of soluble organic carbon was in the order of 20%>15%>10%>25%>5%>control.Thinning could significantly affect the surface soluble organic carbon,and had almost no effect on the deep layer.3) The percentages of ROC,LFOC and DOC in total organic carbon were all the lowest under 15% thinning intensity,ranged from 11.12%-34.44%,16.07%-21.15% and 0.57%-0.82%,respectively.In summary,thinning with intensity of 15% was not only beneficial to the accumulation of total organic carbon in the soil,but
作者
段学鑫
王军会
党坤良
高媛
王先初
DUAN Xue-xin;WANG Jun-hui;DANG Kun-liang;GAO Yuan;WANG Xian-chu(College of Forestry,Northwest A&F University,Yangling 712100,Shaanxi,China;Shaanxi Forest Products Development and Trade Corporation,Xi’an 710077,Shaanxi,China)
出处
《西北林学院学报》
CSCD
北大核心
2020年第1期8-14,共7页
Journal of Northwest Forestry University
基金
林业公益性行业科研专项:陕西秦岭林区森林抚育经营技术与成效监测(A2990215149)
关键词
秦岭南坡
红桦林
间伐强度
活性有机碳
总有机碳
southern slope of Qinling Mountians
Betula albosinensis forest
thinning intensity
active organic carbon
total organic carbon
