太岳山油松林土壤活性碳和微生物特性随外源有机物的变化规律

发布时间：2018-04-10 13:08

本文选题：森林土壤微生物 + 土壤酶　；参考：《福建农林大学学报(自然科学版)》2017年03期

【摘要】：为探讨不同外源碳添加对森林土壤微生物—土壤酶—活性碳库系统的影响规律,在山西太岳山油松林展开了外源碳添加的野外控制试验.试验设计为5种处理,按照250 g·m-2的当量,分别向油松林表层土壤中添加了生物炭、玉米秸秆、辽东栎叶、油松叶和木屑等有机物,以未添加的样方作为对照.研究表明:外源碳的输入,显著提高了碳库各组分的含量和微生物呼吸值(P0.05).酶活性表现出明显差异,纤维素酶(BG、CBH)、几丁质酶(NAG)、氧化酶(PO、PER)活性分别在秸秆、木屑、油松处理下活性最高.代谢熵大小表现为:油松针叶辽东栎阔叶空白木屑生物炭秸秆;微生物熵变化趋势与代谢熵值变化趋势相反.碳库活度、微生物代谢特性和酶活性之间的相关性表现为:纤维素酶和代谢熵成负相关关系,与微生物熵则成正相关关系.氧化酶则与此相反.结合试验结果得出:秸秆和生物炭相较于其他三种处理,具备更强的固碳能力,同时秸秆显著地提高了森林土壤碳的周转速率.
[Abstract]:In order to study the effects of different exogenous carbon supplementation on the microbial soil enzyme activated carbon pool system in forest soil field control experiments of exogenous carbon addition were carried out in Pinus tabulaeformis forest in Taiyue Mountain Shanxi Province.According to the equivalent of 250g m ~ (-2), organic matter such as biocarbon, corn straw, oak leaf, Pinus tabulaeformis leaf and sawdust were added to the topsoil of Pinus tabulaeformis forest, respectively.The results showed that the input of exogenous carbon significantly increased the contents of carbon pool components and microbial respiration value (P0.05N).The activity of Cellulase BGN CBHN, chitinase NAGN, Oxidase POPERwere the highest in straw, sawdust and Pinus tabulaeformis treatments, respectively.The metabolic entropy showed as follows: Pinus tabulaeformis coniferous oak broad-leaved wood sawdust bio-carbon straw; the change trend of microbial entropy was opposite to the change trend of metabolic entropy value.The correlation between carbon pool activity, microbial metabolic characteristics and enzyme activity was as follows: cellulase and metabolic entropy were negatively correlated, and microbial entropy was positively correlated.Oxidase is the opposite.The results showed that straw and biochar had stronger carbon sequestration ability than the other three treatments, and straw significantly increased the turnover rate of forest soil carbon.
【作者单位】：北京林业大学林学院;
【基金】：国家重点研发计划课题项目(2016YFD0600205)
【分类号】：S714

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