去除凋落物和草毡层对寒温带典型森林土壤氮素的短期影响  

Short Term Effects of Litter and Sod Layer Removal on Soil Nitrogen in Typical Forests in Cold Temperate Zone

作　　者：王军[1] 满秀玲[1] WANG Jun;MAN Xiuling(School of Forestry,Northeast Forestry University,Harbin 150040,China)

机构地区：[1]东北林业大学林学院,哈尔滨150040

出　　处：《森林工程》2023年第4期1-9,共9页Forest Engineering

基　　金：国家重点研发项目(2021YFD2200405)。

摘　　要：以大兴安岭北部3种典型森林(白桦(Betula platyphylla)林、樟子松(Pinus sylvestris var.mongolica)林和兴安落叶松(Larix gmelinii)林)为研究对象,通过对对照、去除凋落物、去除草毡6层以及去除凋落物和草毡层4种处理下不同土层(0~10 cm和>10~20 cm)的土壤全氮、有效氮、微生物量氮及其影响因子的研究,探究凋落物和草毡层对寒温带典型森林土壤氮素的影响。结果表明,1)在0~10 cm土层,与对照相比,去除凋落物后土壤全氮、铵态氮和硝态氮含量在白桦林和兴安落叶松林中无显著变化,樟子松林土壤全氮和铵态氮含量无显著变化,而硝态氮含量升高了53.76%(P<0.05);土壤微生物量氮含量在白桦林和兴安落叶松林中分别降低了14.34%和25.94%(P<0.05),在樟子松林中无显著变化。去除草毡层后土壤全氮含量在樟子松林和兴安落叶松林中变化不显著,在白桦林中降低了41.25%(P<0.05);土壤铵态氮含量在兴安落叶松林中无显著变化,在白桦林中降低了52.84%(P<0.05),而在樟子松林中升高了69.09%(P<0.05);土壤硝态氮含量在白桦林和兴安落叶松林中无显著变化,在樟子松林中升高了44.09%(P<0.05);土壤微生物量氮含量在3种林型中降低了16.95%~47.20%(P<0.05)。去除凋落物和草毡层后,土壤全氮和微生物量氮含量在3种林型中均显著降低(P<0.05);土壤铵态氮含量在兴安落叶松中无显著变化,在白桦林中显著降低(P<0.05),而在樟子松中显著升高(P<0.05);土壤硝态氮含量在白桦林和兴安落叶松林中无显著变化,而在樟子松林中升高了44.09%(P<0.05)。2)在>10~20 cm土层,经过不同去除处理,土壤全氮和微生物量氮含量在3种林型中无显著变化;土壤铵态氮和硝态氮含量在白桦林和兴安落叶松林中无显著变化,而在樟子松林中有所升高,且在去除凋落物以及去除草毡层后达显著水平(P<0.05)。3)由相关性分析可知,土壤含水率、pH、总有机碳和可溶�In order to explore the effects of litter and sod layer on soil nitrogen in typical forests in cold temperate zone,the characteristics of soil total nitrogen,available nitrogen,microbial biomass nitrogen and their influencing factors were measured in four different soil layers(0-10 cm and>10-20 cm among four different treatments,including control,litter removal,sod layer removal,and both litter and sod layer removal,at three typical forests(Betula platyphylla forest,Pinus sylvestris var.mongolica forest,and Larix gmelinii forest)of the north Daxing'an mountains.The results showed as follows:1)In the 0-10 cm soil layer,compared with the control,the contents of total nitrogen,ammonium nitrogen and nitrate nitrogen had no significant changes in Betula platyphylla forest and Larix gmelinii forest after the removal of litter.The contents of total nitrogen and ammonium nitrogen had no significant changes in Pinus sylvestris var.mongolica forest,while the nitrate nitrogen content increased by 53.76%(P<0.05).Soil microbial biomass nitrogen contents in Betula platyphylla forest and Larix gmelinii forest decreased by 14.34%and 25.94%(P<0.05),respectively,but had no significant change in Pinus sylvestris var.mongolica forest.After removing sod layer,the contents of total nitrogen did not change significantly in Pinus sylvestris var.mongolica forest and Larix gmelinii forest,but decreased by 41.25%in Betula platyphylla forest(P<0.05).The contents of soil ammonium nitrogen had no significant change in Larix gmelinii forest,decreased by 52.84%in Betula platyphylla forest(P<0.05),while increased by 69.09%in Pinus sylvestris var.mongolica forest(P<0.05).The contents of soil nitrate nitrogen had no significant change in Betula platyphylla forest and Larix gmelinii forest,increased by 44.09%in Pinus sylvestris var.mongolica forest(P<0.05).The contents of soil microbial biomass nitrogen decreased by 16.95%~47.20%in three forest types(P<0.05).After litter and sod layer were removed,the contents of soil total nitrogen and microbial b

关 键 词：森林土壤 去除凋落物 去除草毡层 全氮 有效氮 微生物量氮 

分 类 号：S714.2[农业科学—林学]