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1、应用与环境生物学报2005,11(5):521～527ChinJApplEnvironBiol=ISSN10062687X20052102253马尾松纯林及其与阔叶树混交林的凋落量与养分通量1,233223樊后保李燕燕孙新林德喜(1南昌工程学院生态与环境科学研究所南昌330029)(23福建农林大学林学院,福建农林大学资源与环境学院福州350002)摘要在25a生马尾松林下分别套种1a生火力楠、闽粤栲、苦槠、格氏栲、青栲和拉氏栲等阔叶树种的幼苗,16a后形成郁闭的针阔混交异龄林.通过定位监测和化学分析,对上述6种混
2、交林类型及林下未套种阔叶树的马尾松纯林的-2森林凋落量及养分通量进行了研究.统计结果显示,6个混交群落的年凋落量分别为7137.3kghm、6741.1kg-2-2-2-2-2hm、8041.7kghm、7151.3kghm、7533.2kghm和6149.1kghm,而马尾松纯林的年凋落量仅3442.8kg-2hm.在所有林分的凋落物组成中,枯叶占绝对优势,占凋落物总量的49.7%～71.5%,其余依次为枯枝(5.7%～26.1%)、其它组分(5.5%～17.1%)、树皮(7.7%～18.9%)和果实(0.7%～
3、2.0%).各混交林分中来自马尾松的凋落物占50.4%～58.0%,而来自阔叶树的凋落物占42.0%～49.6%,且两者的组成存在明显差异.各林分总凋落量的季节动态呈双峰型,第1次峰值出现在2～4月份,第2次峰值出现在8、9月份.凋落物中主要养分元素的含量依林分-1-1类型、凋落物组分和凋落时间不同而异,N、P、K、Ca和Mg的含量范围依次为3.25～12.98gkg、0.23～0.97gkg、-1-1-10.42～4.02gkg、7.34～32.57gkg和1.34～5.58gkg.不同的林分类型,凋落物中各养分
4、元素的年通量大小均-2为:Ca>N>Mg>K>P.马尾松纯林中,通过凋落物的5种养分元素的年流通量为142.01kghm;而在林下分别套种-2-2-2-2上述6种阔叶树后,其养分年流通量依次增加到204.95kghm、223.93kghm、304.12kghm、288.46kghm、-2-2213.77kghm、238.05kghm.图3表4参13关键词马尾松;阔叶树;混交林;凋落物;养分通量CLCS791.248.02LITTERACCUMULATIONANDNUTRIENTFLUXESINPINUSMASSON
5、IANA3STANDANDITSMIXEDFORESTSWITHBROAD2LEAVEDTREES1,233223FANHoubao,LIYanyan,SUNXin&LINDexi(1InstituteofEcology&EnvironmentalSciences,NanchangInstituteofTechnology,Nanchang330029,China)(23CollegeofForestry,CollegeofResourcesandEnvironment,FujianAgricultureandFo
6、restryUniversity,Fuzhou350002,China)AbstractOne2yearseedlingsofsixbroad2leavedtreespecies,Micheliamacclurei,Castanopsisfissa,C.sclerophylla,C.kawakamii,CyclobalanopsismyrsinaefoliaandCastanopsislamontii,wereseparatelyplantedin252year2oldartificialforestofPinus
7、massoniana,wihichdevelopedintodifferentclosedmixedforestsafter16years.Litteraccumulationanditsnutrientflu2xeswereanalyzedfortheabove6mixedforestsandtheP.massonianastandplantedwithnobroad2leavedtrees.Datafrom-2two2yearfieldcollectionshowedthatannuallitteraccumu
8、lationinthe6mixedforestswere7137.3kghm,6741.1kg-2-2-2-2-2-2hm,8041.7kghm,7151.3kghm,7533.2kghmand6149.1kghm,respectively,butonly3442.8kghminpurestandP.massoniana.Differenceexisteda
