摘要
探讨小兴安岭原始椴树红松林成熟林、中幼龄林及次生杨桦林的土壤氮组分特征,为评价该地区不同森林植被对土壤氮库的影响提供基础数据。以原始椴树红松林成熟林、中幼龄林和次生杨桦林为研究对象,采样分析了土壤容重、总有机碳、全磷、全氮、速效氮、铵态氮、硝态氮等土壤理化性质。结果表明:全氮、速效氮、铵态氮、硝态氮含量均随土层加深而递减。不同林型同一土层,椴树红松林成熟林及中幼龄林之间土壤全氮和硝态氮含量差异显著(P<0.05),但二者与次生杨桦林之间差异均不显著。土壤全氮与铵态氮、孔隙度呈极显著正相关(P<0.01),与总有机碳、速效氮呈显著相关(P<0.05);土壤硝态氮与速效氮、孔隙度呈极显著正相关(P<0.01),与凋落物量现存量呈显著相关(P<0.05),与含水率呈极显著负相关(P<0.01);铵态氮与全氮、孔隙度呈极显著正相关(P<0.01);速效氮与孔隙度呈极显著正相关(P<0.01),与全氮呈显著正相关(P<0.05),与其他指标相关关系不显著。在不同的氮组分中,速效氮、硝态氮作为优势氮种,对小兴安岭椴树红松林及次生杨桦林植被生长及土壤有机碳的影响作用更显著。地上凋落物对于土壤碳氮的贡献具有延后性,3种林型土壤氮组分差异是土壤理化性质、凋落物、土壤环境等多种因素综合作用的结果。
To evaluate the effects of the different forests on soil nitrogen pool,the study was conducted to detect the characteristics of soil nitrogen components of Tilia Pinus Koraiensis forest in different periods and secondary poplar-birch forest in Lesser Khingan Mountains.Tilia Pinus Koraiensis forest in different periods and secondary poplar-birch forest were taken as the study objects,and soil samples were analyzed for the physical and chemical properties including soil bulk density,total organic carbon,total nitrogen,total phosphorus,available nitrogen,nitric nitrogen,ammonium nitrogen and etc.The results showed that the content of total nitrogen,available nitrogen,ammonium nitrogen and nitrate nitrogen all decreased with the deepening of the soil layer.In the same soil layer of different forest types,soil total nitrogen content and nitrate nitrogen content between mature forest and young forest of Tilia Pinus Koraiensis were significantly different(P<0.05),but there was no significant difference between Tilia Pinus Koraiensis forest in the two periods and secondary poplar-birch forest.Total soil nitrogen had extremely and significantly positive correlation with ammonium nitrogen and porosity(P<0.01),and significant correlation with total organic carbon and available nitrogen(P<0.05).Soil nitrate nitrogen had extremely and significantly positive correlation with available nitrogen and porosity(P<0.01),significant correlation with the present stocking amount of litter(P<0.05),but extremely and significantly negative correlation with moisture content(P<0.01).Ammonium nitrogen had extremely and significantly positive correlation with total nitrogen and porosity(P<0.01).Available nitrogen had extremely and significantly positive correlation with porosity(P<0.01),significantly positive correlation with total nitrogen(P<0.05),but no correlation with other indicators.Among different nitrogen components,available nitrogen and nitrate nitrogen were the dominant types,which had more significant effects on soil organic carbon and forest growth.The contribution of the ground litter to carbon and nitrogen was usually delayed for some reasons,and the differences of soil nitrogen components of the three forest types were the result of the combined effects of many factors such as soil physical and chemical properties,forest litter,soil environment and so on.
作者
刁云飞
张苏
丛喜东
杜倩
王琪瑶
刘学
DIAO Yunfei;ZHANG Su;CONG Xidong;DU Qian;WANG Qiyao;LIU Xue(Northeast Forestry University,Harbin 150040;Heilongjiang Institute of Ecology,Harbin 150081;Heilongjiang Mudanjiang Forest Ecosystem National Positioning Observation Research Station,Harbin 150081;Heilongjiang Key Laboratory of Forest Ecology and Forestry Engineering,Harbin 150081)
出处
《中国农学通报》
2022年第26期69-75,共7页
Chinese Agricultural Science Bulletin
基金
黑龙江省省属科研院所基本科研业务费项目C类“雪被厚度对土壤微生物群落结构的影响”(CZKYF2020C010)
“森林生态屏障保育与资源利用国家技术创新中心”(CZKYF2020A003)。
关键词
椴树红松林
次生杨桦林
氮组分
差异
相关
Tilia Pinus Koraiensis forest
secondary poplar-birch forest
nitrogen components
difference
correlation