川西亚高山3种森林土壤碳氮磷及微生物生物量特征

发布时间：2018-03-19 16:36

本文选题：化学计量　切入点：森林转化　出处：《应用与环境生物学报》2016年04期 　论文类型：期刊论文

【摘要】：以空间代替时间的方法,对川西亚高山天然针叶林、桦木次生林、人工云杉林有机层和矿质层土壤碳、氮、磷化学计量以及土壤微生物生物量和呼吸进行比较分析.结果表明,天然针叶林转化为次生林和人工林,土壤有机层碳、氮、磷,微生物生物量碳、氮含量及微生物呼吸均显著下降,其中微生物生物量碳依次为天然林(727.98 mg/kg)次生林(554.56 mg/kg)人工林(239.83 mg/kg),微生物生物量氮为天然林(72.56 mg/kg)次生林(50.42 mg/kg)人工林(20.78 mg/kg),而矿质层各测定变量在3个森林群落之间差异基本不显著.各森林群落有机层土壤碳、氮、磷,微生物生物量及呼吸均显著高于矿质层,而碳氮比和微生物生物量碳氮比在土壤层次之间差异不大.相关分析表明,土壤碳、氮、磷及化学计量比及微生物变量之间存在显著相关关系.综上所述,森林转换显著影响川西亚高山土壤碳、氮、磷化学计量及微生物生物量,且影响主要体现在土壤有机层.
[Abstract]:The soil carbon, nitrogen and phosphorus stoichiometry, microbial biomass and respiration in organic and mineral layers of natural coniferous forest, birch secondary forest and artificial spruce forest in western Sichuan were analyzed by space instead of time. Natural coniferous forest was transformed into secondary forest and artificial forest. Soil organic layer carbon, nitrogen, phosphorus, microbial biomass carbon, nitrogen content and microbial respiration decreased significantly. The microbial biomass carbon in natural forest is 727.98 mg / kg) in secondary forest (554.56 mg / kg). In artificial forest, it is 239.83 mg / kg. The microbial biomass nitrogen is 72.56 mg / kg in natural forest. The biomass nitrogen in secondary forest is 50.42 mg / kg). Soil carbon in organic layers of forest communities, Nitrogen, phosphorus, microbial biomass and respiration were significantly higher than those in mineral layer, but there was no significant difference between soil carbon and nitrogen ratio. In conclusion, forest conversion significantly affected carbon, nitrogen, phosphorus and microbial biomass in the subalpine soils of western Sichuan, and the effects were mainly in the soil organic layer.
【作者单位】：四川农业大学生态林业研究所四川省林业生态工程重点实验室;四川农业大学高山森林生态系统定位研究站长江上游生态安全协同创新中心;
【基金】：国家自然科学基金项目(31570601,31570445,31500509) 中国博士后科学基金(2013M540714,2014T70880)资助~~
【分类号】：S714

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