不同类型和经营方式的毛竹林枯落物养分状况

Study on Variation Characteristics of Nutrient Status of litter in Different Phyllostachys pubescens Stand Types

对采集位于浙江富阳路西和尖山的毛竹（PhyUostachyspubescens）林冬季和夏季凋落物（2002-2003年），结果表明：不论冬季或夏季未垦复毛竹林凋落物烘干重量均高于垦复毛竹林，垦复之后凋落物数量显著减少。未垦复毛竹林凋落物烘干重量是垦复毛竹林的2．13～2．46倍，竹阔混交林分别是未垦复毛竹林和垦复毛竹林的3．07～3．65倍与1．79~2．27倍。冬季或夏季垦复毛竹林凋落物养分含量和贮量由高到低序列为：Ca、K、N、P、Mg，养分含量O．2～5．1g／kg，养分贮量0．51＂-22．46kg／hm2，未垦复毛竹林和竹阔混交林凋落物养分含量和贮量高低序列完全一致．即N、Ca、K、Mg、P，未垦复毛竹林相应养分含量0．29~19．81g／k，养分贮量2．11~57．29kg／hm。，竹阔混交林相应养分含量0．52～19．89g／kg，养分贮量3．74~236．37kg／hm2。因此．毛竹林垦复之后虽然改善了土壤结构和水热状况．但由于林地表层的凋落物数量大为减少，制约土壤潜在肥力的提高因而需要引起关注。

This paper dealt with a study on the nutrient status of litter collected in different phases when from 2002 to 2003 on winter or summer at reclamation and non reclamation pure Moso （Phyllostachys puhescens）stands or mixed Moso with broadleave stands by means of fixed monitoring in Luxi and Jianshan forest region, Fuyang county,Zhejiang province,P.R.C. ANOVA results showed that the dry weight of litter in non reclamation Moso stands were higher than reclamation pure Moso stands while it significantly reduced after reclamation. It indicated that the average dry weight of litter in non reclamation Moso stands were 2.13~2.46 times than that of reclamation＇s stands in winter or summer, while mixed Moso with broadleave stands were 3.07~3.65 or 1.79-2.27 times than that of non reclamation stands or reclamation stands respectively. It also appeared absolutely the same variation characteristics as order of nutrient content or storage of litter between non reclamation Moso stands and mixed Moso with broadleave stands were as follow： N,Ca,K,Mg,P, Whereas the order of nutrient content or storage of litter on winter or summer in reclamation Moso stands were as follow： Ca,K ,N ,P,Mg, From the view point of both the nutrient content or storage of litter in reclamation Moso stands range0.2~5.1g/kg while nutrient storage from 0.51-22.46kg/hm2, Nutrient content of non reclamation Moso stand range 0.29~ 19.81g/kg while nutrient storage from 2.11 ~57.29kg/hm2 and it＇s range 0.52-19.89g,/kg while nutrient storage from 3.74~236.37kg/hm2 in mixed Moso with broadleave stands. Therefore it must be pay sufficiently attention to soil management for reclamation can restricted improving potential soil fertility as greatly reduced amount of litter on surface in Moso stands although it can improve soil structure and moisture condition.