霞浦县阔叶混交林生态系统碳、氮储量格局

摘要

Carbon contents,nitrogen contents,carbon storage patterns and nitrogen storage patterns among different-aged broad-leaved mixed forest ecosystem in Xiapu County were analyzed based on the theory of the investigation in National Carbon Sequestration Special Investigation.Result shows that:the carbon (C)contents of different organ in shrub were ranked as followed:branch > trunk > root > leaf,the nitrogen (N)contents were ranked as leaf >trunk > root > branch.Within the herb layer,both C and N contents are ranked as above-ground biomass > un-derground biomass,with an increase in soil depth.The C and N contents of soil decreased with the increase of the stand age.The descending order of C/N ratio of each component if system decrease with branch,root,trunk,litter, leaf and soil layer;the C storage in 12-year-old,19-year-old,and 28-year-old broad-leaved mixed forest ecosystem is 164.066,231.751 & 290.985 t hm- 2 ,respectively;the N storage is 15.011,23.503 & 31.236t hm- 2;the C stor-age in soil accounted of 60.27%.46.50% & 39.50% among forest ecosystem;the percentage of N storage is 45. 94%,33.09% and 28.67%,both C and N storage in tree layer,shrub layer,litter layer &soil layer displays increas-ing patterns with stand age.%依据全国碳汇专项调查的理论和方法,对福建省霞浦县不同林龄阔叶混交林生态系统各组分的碳、氮含量及碳、氮储量格局进行调查分析,结果表明：灌木层各器官碳含量从大到小依次为枝>干>根>叶,氮含量为叶>干>根>枝；草本层碳、氮含量从大到小均为地上部分>地下部分；土壤碳、氮含量均随土层深度增加而降低,随林龄的增大而上升；系统各组分C/N从大到小依次为枝>根>干>枯落物>叶>土壤；12年生、19年生和28年生阔叶混交林生态系统的碳储量分别为164.066、231.751和290.985 t hm-2,氮储量分别为15.011、23.503和31.236 t hm-2,其中,土壤层碳储量所占比重分别为60.27%、46.50%和39.50%,氮储量所占比重分别为45.94%、33.09%和28.67%；乔木层、灌木层、枯落物层和土壤层碳、氮储量均随林龄的增大而增加。