南亚热带典型乡土阔叶人工林与桉树人工林土壤微生物量氮及可溶性氮特征

发布时间：2018-06-06 06:47

本文选题：土壤微生物量氮 + 土壤可溶性氮　；参考：《应用与环境生物学报》2017年04期

【摘要】：土壤微生物量氮(Microbial biomass nitrogen,MBN)及可溶性氮可表征土壤氮素的动态变化规律与土壤肥力水平,其研究可为人工林建设中的树种选择以及人工林多重服务功能的评价提供科学参考.对我国南亚热带地区红椎(Castanopsis hystrix)、米老排(Mytilaria laosensis)、火力楠(Michelia macclurei)和山白兰(Paramichelia bailonii)等4种乡土阔叶人工林以及外来速生桉树(Eucalyptus)人工林不同土层(0-20 cm、20-40 cm和40-60 cm)土壤MBN与可溶性氮[游离氨基酸(Free amino acid,FAA)、硝态氮(NO_3~--N)和铵态氮(NH_4~+-N)]含量特征进行研究.结果表明,林分类型、土层深度及二者的交互作用对土壤NO-3-N含量无显著性影响(P0.05);4种乡土阔叶人工林在0-20 cm土层的土壤MBN含量高于桉树人工林;桉树人工林土壤FAA含量在各土层均呈现出高于乡土阔叶人工林的趋势,但桉树人工林土壤NH_4~+-N含量与乡土阔叶人工林之间无明显规律.Pearson相关分析表明土壤pH值和有机质含量是影响不同树种人工林土壤MBN、FAA和NH_4~+-N含量的2个主要因素.总体而言,4种乡土阔叶人工林土壤在有效性氮储备和供应方面并不一定优于桉树人工林.
[Abstract]:Soil microbial biomass nitrogen (MBN) and soluble nitrogen (SN) can characterize the dynamic change of soil nitrogen and soil fertility level, which can provide scientific reference for the selection of tree species in plantation construction and the evaluation of multiple service function of artificial forest. Four native broadleaved plantations of Castanopsis hystrixi, Mytilaria laosensis, Michelia macclureii and Paramichelia Bailonii) in the subtropical region of China, as well as 0-20 cm-1 (20-40 cm) and 40-60 cm (cm) of soluble nitrogen in different soil layers of exotic Eucalyptus plantations, were studied. The content characteristics of free amino acid free amino acidn (FAA), nitrate nitrogen (no _ 3 ~ -N) and ammonium nitrogen (NH _ 4 ~ -N) were studied. The results showed that there was no significant effect on soil NO-3-N content in stand type, soil depth and interaction between them. The MBN content of four native broadleaved plantations in 0-20 cm soil layer was higher than that in eucalyptus plantation. The soil FAA content of eucalyptus plantation was higher than that of native broad-leaved plantation in each soil layer. Pearson correlation analysis showed that soil pH value and organic matter content were two main factors affecting MBNFAA and NH4- N content in soil of different tree species plantation, but there was no obvious regularity between soil NH4 ~ -N content and native broad-leaved plantation soil content in eucalyptus plantations, and Pearson correlation analysis showed that soil pH value and organic matter content were two main factors affecting soil MBN- FAA and NH4- N content in different tree species plantations. In general, the available nitrogen storage and supply of four native broadleaved plantations were not necessarily superior to those of eucalyptus plantations.
【作者单位】：广西大学林学院;中国林业科学研究院林业科技信息研究所;中国林业科学研究院热带林业实验中心;
【基金】：国家自然科学基金项目(31270681)资助~~
【分类号】：S714

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