中亚热带4种森林类型土壤有机碳氮贮量及分布特征  

Storage and Distribution of Soil Organic Carbon and Nitrogen in Four Subtropical Forests in Central Southern China

作　　者：路翔[1,2] 项文化[1,2] 刘聪[1,2] 

机构地区：[1]湖南会同杉木林生态系统国家野外科学观测研究站,湖南会同438107 [2]中南林业科技大学生命科学与技术学院,长沙410004

出　　处：《水土保持学报》2012年第3期169-173,共5页Journal of Soil and Water Conservation

基　　金：国家重点基础研究发展计划("973"计划)项目(2010CB833501)

摘　　要：对湖南省长沙县大山冲省级森林公园立地条件基本一致的4种森林土壤有机碳(SOC)、全氮(N)含量、贮量及土层分布进行研究。结果表明:不同森林、同一森林的不同土层SOC、N含量和贮量均存在显著差异(p<0.05)。各土层SOC含量的变化范围分别为杉木林8.66～22.96g/kg,马尾松林13.33～37.50g/kg,南酸枣林13.78～43.58g/kg,青冈林13.33～36.87g/kg。土壤全N含量的变化范围分别为杉木林1.37～2.29g/kg,马尾松林1.29～2.65g/kg,南酸枣林1.69～3.96g/kg,青冈林1.23～3.26g/kg。4种林地SOC和N含量均随土层深度增加而逐渐下降。4种森林土壤SOC贮量差异不显著(p=0.177 6),N贮量差异极显著(p=0.000 7)。4种森林土壤SOC含量与N含量存在极显著相关性(p<0.01),除青冈林外,其余3种森林土壤SOC与C/N存在极显著相关关系(p<0.01)。马尾松土壤N与C/N之间呈极显著相关(p<0.01),南酸枣林的存在显著关系(p<0.05),青冈林和杉木林的相关性不显著。Soil organic carbon（SOC） and nitrogen（N） concentration,storage and distribution in soil profile were investigated in four subtropical forests in hilly area of central Hu’nan province,China.The results showed that SOC and N concentration and storage differed significantly among the four forests and soil depths（p〈0.05）.In general,SOC and N concentration in the four forests decreased with soil depth,ranging from 8.66 g/kg to 22.96 g/kg for C.lanceolata plantation,from 13.33 g/kg to 37.50 g/kg for P.massoniana mixed forest,from 13.78 g/kg to 43.58 g/kg for C.axillaris forest,and from 13.33 g/kg to 36.87 g/kg for C.glauca mixed forest.Soil N concentration varied from 1.37 g/kg to 2.29 g/kg for C.lanceolata plantation,from 1.29 g/kg to 2.65 g/kg for P.massoniana mixed forest,from 1.69 g/kg to 3.96 g/kg for C.axillaris forest,and from 1.23 g/kg to 3.26 g/kg for C.glauca mixed forest.Differences in SOC concentration among four forests varied with soil depths.Four forests had no significant difference in SOC storage（p=0.177 6）,but showed significant difference for total N storage（p=0.000 7）.SOC concentration was positively correlated with total N concentration（p〈0.01）,and had a significant correlation with C/N（p〈0.01） exception of C.glauca mixed forest.Soil N concentration significantly correlated with C/N for P.massoniana mixed forest（p〈0.01） and C.axillaris forest（p〈0.05）,but correlation was insignificant for C.lanceolata plantation and C.glauca mixed forest（p〉0.05）.

关 键 词：杉木 马尾松 南酸枣 青冈 土壤有机碳 土壤氮 碳氮贮量 C/N 

分 类 号：S714.8[农业科学—林学] S153.62