氮、硫沉降下凋落物分解失重规律  

Response of Litter Decomposition Mass Loss Rate to Simulated Nitrogen And Sulfur Deposition with Rotation-orthogonal Combination Design

作　　者：包和林[1] 张艳荷[1] 侯丹[1] 吕广林[1] 洪伟[1] 范海兰[1] 吴承祯[1] 李键[1] 

机构地区：[1]福建省高校森林生态系统过程与经营重点实验室,森林生态研究所,福建农林大学林学院,福建福州350002

出　　处：《中南林业科技大学学报》2009年第5期77-81,共5页Journal of Central South University of Forestry & Technology

基　　金：教育部博士点学科专项基金资助项目(200803890010)

摘　　要：采用二次正交回归旋转设计,分析了邓恩桉人工林幼龄林凋落物分解失重率与N、S沉降之间的数量关系,并建立了失重率与N、S两因素的回归模型.结果表明:S沉降在编码范围[-1.414,1414]内促进凋落物分解,N沉降在低水平[-1414,0]促进凋落物分解,而在N沉降增加到编码值0水平后[0,1.414]抑制凋落物的分解,S沉降对凋落物失重率增加的影响比N沉降大;硫x1∈[-0.5,1.414]与氮x2∈[-1,1.414]编码范围内,x1与x2相互增效.Relations between the litter decomposition of Dunn Eucalyptus dunnii plantation and the deposition of N and S were studied by means of a quadratic rotation-orthogonal combination design,and regression models for the weight loss and N/S deposition were also established.Experiment results indicate that S deposition promotes litter decomposition within the coded range（-1.414,1414） and N deposition promotes litter decomposition at a lower level（-1414,0） but the code increases to 0,it inhibits litter decomposition;that for the increasing effects of litter weight loss,S deposition is much more important than N deposition and S deposition plays a positive role in the impact of N deposition on litter decomposition-promoting;and that both S and N depositions display an effect of mutual promotion within the coded range（-0.5,1.414） of sulfur and（-1,1.414） of nitrogen.

关 键 词：邓恩桉人工林 N、S沉降 凋落物分解 失重率 

分 类 号：Q142[生物学—生态学] Q948[生物学—普通生物学]