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时间:2020-05-02
《低强度林火对兴安落叶松林土壤理化性质的影响.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、安徽农业科学。JournalofAnhuiA.Sci.2014,42(14):4305-4308责任编辑高菲责任校对李岩低强度林火对兴安落叶松林土壤理化性质的影响杜嘉啉,胡海清(1.东北林业大学林学院,黑龙江哈尔滨15oo40;2.黑龙江省森林保护研究所,黑龙江哈尔滨l50040)摘要[目的]探讨低强度林火对兴安落叶松林土壤理化性质的影响。[方法]依据地表可燃物损耗量来判断林火强度,在大兴安岭松岭林区落叶松林混交林火烧迹地选择低强度林火迹地为样地,对低强度林火迹地与对照样地的土壤理化性质进行3a连续测定和比较分析研究。[结果]低强度林火主要影响森
2、林土壤A层容重,没有对土壤B层产生显著影响;低强度林火燃烧后土壤A层持水量和贮水能力减小,火烧虽然没有改变土壤B层的有机质,但孔隙度相差明显;低强度林火提高了A层土壤pH,随时间的推移土壤pH从6.4恢复到5.4,说明低强度林火对土壤pH影响有限;低强度林火对土壤有机质再分配是有影响的,不单纯地表现为减少趋势,可能更多的是分解;土壤营养元素中以N素最易挥发,火烧后迹地土壤A层全N量下降;低强度林火对速效K含量增加只限于一个生长季。火后ca,Mg和P的含量的变化结果与K近似。[结论]有计划地实施低强度林火对森林具有一定的保护作用。关键词低强度林火;
3、土壤性质;影响中图分类号S762文献标识码A文章编号0517—6611(2014)14—04305—04EfectsofLow.intensityForestFiripsonS珊PropertiesofLarix胂棚豇DUJia-lin,HUHai-qing(CollegeofForestry,N0nheastForestryUniversity,Harbin,Heilongiang150040)Abstract『0biective]eefectsof1ow—intensityforestfiresonsoilpropertiesofLar/xg
4、meliniiwerestudied.fMetIlod]Sollphysicalandchemi—calcharactersofmixeddeciduouspineforestunderlow—intensityfclrestfireatXinLindistriet,Daxinganlingregionwereinvestigatedfor3years.『Resuh1LowintensitymainlyafectsAlayerVolumeweight,andhasnosignificanteffectiononforestsoil0fBlayer
5、.Afterlowintensityforestfire,thewater-holdingcapacityofAlayerwasdescent,andtheforestfiredidn’tchangetheorganicmatter,buttheporosityofsoilhasbeenchanged.Low—intensityforestfirecanimprovethesoilpHofAlayer.Withthetimepassed.thepHofsoilrestoredfrom6.4to5.4.thelow—inten.sitvfiresh
6、avealimitedimpactonsoilpH.Lowintensityforestfirecanaffectthesoilorganicmatterredistribution.whichhasmoreimportantim—pactonorganicmatterisdecomposition.Afterlow.intensityforestfire.theenhanceofnitrogenmineralizerateledtoadecreaseofnitrogeninAlayer.TheenhanceofavailableKafterlo
7、w—intensityfirescanonlycontinueonegrowingseason.ThecontentchangesofCa.MgandPweresimi—larlytoKafterlow.intensityforestfire.IConclusionlnleimplementationoftheplantedlowintensityfireshascertainprotectiveeffectonforest.KeywordsLow—inteosityforestfire;Soilproperties:Efect林火是生态系统中的
8、重要生态因子之一。林火会燃兴安杜鹃RhododendrondauricumL)、东北赤杨Alnusman&烧大量的森林凋落物,进而影响土
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