采伐强度对小兴安岭低质林分土壤碳通量的影响  

Impact of Cutting Intensity on Soil Carbon Flux in Low-Quality Forest Stands of Lesser Khingan Range

作　　者：郭辉[1] 董希斌[1] 姜帆[1] 

机构地区：[1]东北林业大学森林持续经营与环境微生物工程黑龙江省重点实验室,哈尔滨150040

出　　处：《林业科学》2010年第2期110-115,共6页Scientia Silvae Sinicae

基　　金：黑龙江省重大攻关项目"低质林结构优化与功能调控技术研究与示范"(GA07B301-05);东北林业大学研究生创新资助项目

摘　　要：针对择伐后的小兴安岭低质林分,采用LI-8100碳通量自动监测系统在春、夏、秋、冬4个季节对低质林分土壤碳通量进行观测,运用统计分析方法,分析采伐强度对土壤碳通量、土壤温度与湿度的影响。结果表明:采伐区的土壤碳通量高于对照区,随采伐强度的增加土壤碳通量呈现波动性,从采伐强度22%～47%,碳通量逐渐减小,之后趋于平稳,春、夏、秋、冬4个季节土壤碳通量的最大值出现在低度和中度采伐强度林分条件下;随采伐强度增加土壤温度增加,土壤湿度减少,土壤碳通量与距地表10cm处的土壤温度的关系符合指数模型,土壤碳通量与土壤湿度的关系符合一元二次模型;从标准化回归方程看出,土壤碳通量主要由土壤温度与湿度共同影响,且土壤湿度对碳通量的影响大于土壤温度的影响。采伐强度与土壤碳通量具有负相关性,二者的关系为双曲线。In the spring,summer,autumn and winter,for the low-quality forest stands of Lesser Khingan Range after selective cutting,the soil CO_2 flux of the low-quality forest stands was observed by the LI-8100 CO_2 flux automatic monitoring system. The influence of cutting intensity on the soil CO_2 flux,soil temperature and moisture was analyzed using methods of statistical analysis. The results showed that the soil CO_2 flux in the selective-cutting zone was higher than that in the check zone,and with the increase of cutting intensity,the soil CO_2 flux had the trend of decrease in the cutting intensity at 22%-47%,then stabilized. In the spring,summer,autumn and winter,the maximum value of soil CO_2 flux appeared in the conditions of the low and moderate cutting intensity forest stands. With the increase in harvesting intensity soil temperature increased,soil moisture reduced.The index model was suitable to the relationships between soil CO_ 2 flux and soil temperature which was 10 cm from the surface of the earth,and the quadratic model was suitable to the relationships between soil CO_ 2 flux and soil moisture. According to the standardized regression equation,soil temperature and moisture were the main reasons which effect the soil CO_2 flux,furthermore,the influence of soil moisture was bigger than soil temperature. Cutting intensity and soil CO_2 flux had a negative correlation,the relationship between the two was suit able to the hyperbola.

关 键 词：低质林 采伐强度 土壤碳通量 土壤温度 土壤湿度 

分 类 号：S154.1[农业科学—土壤学]