阔叶和杉木人工林对土壤碳氮库的影响比较  

Effects of broadleaf plantation and Chinese fir(Cunninghamia lanceolata) plantation on soil carbon and nitrogen pools

作　　者：万晓华[1,2] 黄志群[1,2] 何宗明[3] 胡振宏[1,2] 杨靖宇[3] 余再鹏[1,2] 王民煌[1,2] 

机构地区：[1]湿润亚热带山地生态国家重点实验室培育基地,福州350007 [2]福建师范大学地理科学学院,福州350007 [3]福建农林大学林学院,福州350002

出　　处：《应用生态学报》2013年第2期345-350,共6页Chinese Journal of Applied Ecology

基　　金：2011教育部新世纪优秀人才计划项目(DB-168)资助

摘　　要：通过比较我国亚热带地区19年生阔叶人工林和杉木人工林土壤碳氮储量,探讨树种对土壤碳氮库的影响.结果表明:阔叶人工林0～40cm土层碳储量平均为99.41Mg·hm-2,比杉木人工林增加33.1%;土壤氮储量为6.18Mg·hm-2,比杉木人工林增加22.6%.阔叶人工林林地枯枝落叶层现存量、碳和氮储量分别是杉木人工林的1.60、1.49和1.52倍,两个树种的枯落叶生物量、碳和氮储量均有显著差异.枯枝落叶层碳氮比值与土壤碳、氮储量之间呈显著负相关.阔叶人工林细根生物量(0～80cm)是杉木林的1.28倍,其中0～10cm土壤层细根生物量占48.2%;阔叶人工林细根碳、氮储量均高于杉木人工林.在0～10cm土层,细根碳储量与土壤碳储量具有显著正相关关系.阔叶树种比杉木的土壤有机碳储存能力更大.A comparative study was conducted on the soil C and N pools in a 19-year-old broadleaf plantation and a Chinese fir（Cunninghamia lanceolata） plantation in subtropical China,aimed to understand the effects of tree species on the soil C and N pools.In the broadleaf plantation,the C and N stocks in 0-40 cm soil layer were 99.41 Mg·hm-2 and 6.18 Mg·hm-2,being 33.1 % and 22.6 % larger than those in Chinese fir plantation,respectively.The standing biomass and the C and N stocks of forest floor in the broadleaf plantation were 1.60,1.49,and 1.52 times of those in Chinese fir plantation,respectively,and the differences were statistically significant.There was a significant negative relationship between the forest floor C/N ratio and the soil C and N stocks.In the broadleaf plantation,the fine root biomass in 0-80 cm soil layer was 1.28 times of that in the Chinese fir plantation,and the fine root biomass in 0-10 cm soil layer accounted for 48.2 % of the total fine root biomass.The C and N stocks in the fine roots in the broadleaf plantation were also higher than those in the Chinese fir plantation.In 0-10 cm soil layer,its C stock had a significant positive relationship with the fine root C stock.It was suggested that as compared with Chinese fir plantation,the soil in broadleaf plantation had a greater potential to accumulate organic carbon.

关 键 词：杉木 土壤碳 土壤氮 枯枝落叶层 细根 

分 类 号：S714[农业科学—林学]