近自然杉木林经营对土壤微生物量碳氮特征的影响  

Effect of Near-natural Management of Chinese Fir Plantation on Characteristics of Soil Microbial Biomass Carbon and Nitrogen

作　　者：石丽娜 林开敏 陈梦瑶 许诺 吴培培 刘圣恩 

机构地区：[1]福建农林大学林学院,国家林业局杉木工程技术研究中心,福建福州350002

出　　处：《土壤通报》2018年第1期112-118,共7页Chinese Journal of Soil Science

基　　金：国家重点研发计划项目的课题(2016YFD0600301)和国家林业局杉木工程技术研究中心孵化基金项目和福建农林大学科技创新专项基金(CXZX2017109;CXZX2016057)资助

摘　　要：在福建农林大学西芹教学林场,比较不同近自然杉木林经营模式(老龄林、萌芽林)与对照(91年二代杉木人工林(炼山)、93年二代杉木人工林(不炼山)、天然林)的土壤微生物量碳氮(MBC、MBN)含量的差异。结果表明:近自然杉木林经营模式(老龄林、萌芽林)和天然林的各层次土壤MBC、MBN含量及其占土壤全碳(TC)和全氮(TN)的比例均高于91年二代杉木人工林和93年二代杉木人工林;土壤MBC含量与土壤MBN含量呈显著正相关;土壤MBC/MBN除在0~10 cm土层,91年二代杉木人工林略高于老龄林外,其它土层均以老龄林最高;从土壤的垂直分布特征来看,5种模式的各层次土壤MBC、MBN含量大小依次均为0~10 cm>10~20 cm>20~40 cm>40~60 cm,即呈现出土壤MBC、MBN含量随土层的加深而降低的趋势。说明近自然杉木林经营模式(老龄林、萌芽林)更有利于土壤微生物的繁殖与生长,具有较高的土壤肥力。The differences in soil microbial biomass carbon （MBC） and soil microbial biomass nitrogen （MBN） were compared among different management patterns of Chinese fir plantation, including near-natural patterns of old-growth forests and sprout forests and traditional management patterns of second-generation 91 （controlled-burning） and 93 （without controlled-burning, natural forest） in the teaching forest farm in Fujian Agriculture and Forestry University. The results showed that the concentrations of soil MBC and MBN and the ratio of MBC to total carbon （TC） and that of MBN to total nitrogen （TN） were higher at all soil layers in near-natural and natural forest of Chinese fir plantation than in the second generation Chinese fir plantation 91 and 93. Soil MBC presented significantly positive correlation with soil MBN. The ratio of MBC to MBN was the highest at soil layers in the old-growth forest except at 0 - 10 cm soil layer in the second generation Chinese fir plantation 91. The contents of soil MBC and MBN decreased along soil depth. In sum, the management patterns of near-natural Chinese fir plantation would be more benefit for soil microbial reproduction and soil fertility.

关 键 词：老龄林 萌芽林 土壤微生物量碳 土壤微生物量氮 

分 类 号：S791.2[农业科学—林木遗传育种]