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首页> 外文期刊>Journal of soil & sediments >Soil soluble organic nitrogen and active microbial characteristics under adjacent coniferous and broadleaf plantation forests
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Soil soluble organic nitrogen and active microbial characteristics under adjacent coniferous and broadleaf plantation forests

机译：针叶和阔叶人工林下土壤可溶性有机氮和活性微生物特征。

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摘要

Purpose Soil soluble organic nitrogen (SON) is considered as a sensitive indicator of soil nitrogen (N) status and plays an important role in N cycling in forest ecosystems. Most work on forest soil SON to date has been conducted in temperate areas. The information about soil SON pools and dynamics in tropical and subtropical areas is limited. The aim of this study was to investigate the effects of different forest types on soil SON availability and associated microbial properties.rnMaterials and methods Soil samples were collected at two depths (0-20 and 20-40 cm) from adjacent 12-year-oldrnplantation forests of coniferous Chinese fir (Cunninghamia lanceolata (Lamb) Hook; Coniferous Fir), coniferous-broadleaf mixed species of broadleaf Nagai Podocarpus and coniferous Pond cypress (mixed species), and broadleaf Phoebe nanmu (broadleaf Phoebe) in subtropical China. Three extraction methods (water, hot water, and 2 M KCl) were used for measurements of SON. Soil microbial biomass carbon (C) and N and activities of urease, protease, and L-asparaginase were also measured. Results and discussion Hot water and KC1 extractable SON pools were greater in the surface soils (0-20 cm) under the broadleaf Phoebe than under the Coniferous Fir, while those under the mixed species were intermediate. The microbial biomass C and N as well as activities of protease and urease were higher in the soils under the broadleaf Phoebe and mixed species than under the Coniferous Fir. Soluble organic C and SON pools were positively related to soil total C and N and microbial biomass C and microbial biomass N. Activities of urease, protease, and asparaginase were highly correlated with SON_w, SON_(hw), and SON_(KCI). This work has demonstrated that forest type had significant impacts on the pool size of soil SON. This may be attributed to the different quantity and quality of organic inputs from different forest systems. Positive relationships between microbial biomass and enzyme activities with the SON pools clearly demonstrated that microbial communities play a vital role in the dynamics of soil SON in forest ecosystems.rnConclusions It is recommended that soil SON measured by hot water extraction be incorporated into the routine measurement of soil available N in forest ecosystems. Further study on the role of specific microbial functional groups in the SON transformation and the chemical nature and seasonal dynamics of SON pools in forest ecosystems is warranted.
机译：目的土壤可溶性有机氮（SON）被认为是土壤氮（N）状态的敏感指标，在森林生态系统的氮循环中起着重要作用。迄今为止，大多数有关森林土壤SON的工作都是在温带地区进行的。关于热带和亚热带地区土壤SON库和动力学的信息是有限的。这项研究的目的是调查不同森林类型对土壤SON有效性和相关微生物特性的影响。rn材料和方法从相邻的12年生植物的两个深度（0-20和20-40 cm）收集土壤样品针叶林（Cunninghamia lanceolata（Lamb）Hook; Coniferous Fir）的森林，阔叶长Na罗汉松和针叶池塘柏的针叶-阔叶混交种（混合物种），以及亚热带中国的阔叶楠木（Broadleaf Phoebe）。三种提取方法（水，热水和2 M KCl）用于SON的测量。还测量了土壤微生物生物量碳（C）和氮以及脲酶，蛋白酶和L-天冬酰胺酶的活性。结果与讨论阔叶菲比下表层土壤（0-20厘米）的热水和KC1可提取SON池大于针叶冷杉下的，而混合树种下的则较高。阔叶楠木和混交种下的土壤微生物量碳，氮以及蛋白酶和脲酶活性高于针叶冷杉。可溶性有机碳和SON库与土壤总C，N，微生物量C和微生物量N呈正相关。脲酶，蛋白酶和天冬酰胺酶的活性与SON_w，SON_（hw）和SON_（KCI）高度相关。这项工作表明，森林类型对土壤SON的库大小有重大影响。这可能归因于来自不同森林系统的有机投入的数量和质量不同。 SON库中微生物生物量与酶活性之间的正相关关系清楚地表明，微生物群落在森林生态系统中土壤SON的动力学中起着至关重要的作用。结论结论建议将热水提取法测得的土壤SON纳入常规的SON测定中。森林生态系统中土壤速效氮。有必要进一步研究特定微生物功能基团在SON转化中的作用以及森林生态系统中SON库的化学性质和季节动态。

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  • 来源
    《Journal of soil & sediments》 |2010年第4期|p.748-757|共10页
  • 作者

    Shihe Xing; Chengrong Chen; Biqing Zhou; Hui Zhang; Zhongmin Nang; Zihong Xu;

  • 作者单位

    College of Resource and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China Environmental Futures Centre, School of Biomolecular and Physical Sciences, Griffith University, Nathan 4111, Australia;

    rnInstitute of Crop Sciences, Fujian Academy of Agriculture Sciences, Fuzhou 350003, China Environmental Futures Centre, Griffith School of Environment, Griffith University, Nathan 4111, Australia;

    rnCollege of Resource and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China;

    rnInstitute of Soil and Fertilizer, Fujian Academy of Agriculture Sciences, Fuzhou 350003, China;

    rnInstitute of Soil and Fertilizer, Fujian Academy of Agriculture Sciences, Fuzhou 350003, China;

    rnEnvironmental Futures Centre, School of Biomolecular and Physical Sciences, Griffith University, Nathan 4111, Australia;

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  • 正文语种 eng
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  • 关键词

    coniferous and broadleaf forests; enzyme activity; hot water extraction; microbial biomass; soil soluble organic nitrogen (SON);

    机译：针叶和阔叶林;酶活性热水提取;微生物生物量土壤可溶性有机氮（SON）;

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