不同类型毛竹林枯落物碳质量分数的比较

Variation Characteristics on Mass Fraction of Carbon of Forest Litter of Phyllostachys pubescens Stands

运用森林生态定位研究方法，选择位于天目山余脉的浙江富阳春建尖山林区，天台山余脉的奉化新建林区，参照毛竹林分不同立地和经营条件，采集毛竹纯林、毛竹阔叶树混交林（竹阔混交林，下同）的枯落物样品。结果显示：不同毛竹林分的枯落物碳素质量分数存在显著差异（p〈0．05），竹阔混交林的枯落物平均碳质量分数是34．46％（31．06％-37．55％，n=18），垦复毛竹林是29．62％（26．89％-31．79％，n=12），未垦复毛竹林是29．76％（16．82％-33．76％，n=12）；垦复与未垦复毛竹林差异不显著。林地枯落物有机碳储量序列：竹阔混交林〉未垦复毛竹林〉垦复毛竹林，垦复后不利于枯落物碳素累积．竹阔混交林比毛竹纯林具有更强的枯落物碳贮存。

We collected samples of forest litter of different Moso bamboo stands including pure Moso bamboo stands and mixed Moso bamboo with broadleaf stands in the early July of the year 2009 with fixed monitoring ecological station, in the meanwhile measured the carbon concentration of litter. Results showed： there existed significant difference on carbon concentration of litter among different stands, the average carbon concentration of litter that mixed stands was 34.46% ,while the reclamation＇ stands was 29.62% and non reclamation＇ was 29.76%,however there existed slightly difference between reclamation and non＇s. The order of organic carbon storage of litter were as follow： mixed Moso bamboo with broadleaf stands〉non reclamation stands〉reclamation stands, therefore it would adverse to accumulation of carbon element of litter, the storage ability of litter carbon appeared mixed stands were much more than that of pure stands.