关键词: 毛竹林, 凋落物, 垦复, 养分含量, 养分贮量

Abstract: This paper dealt with a study on the nutrient status of litter collected in different phases from 2002 to 2003 in winter or summer in reclamation and non-reclamation pure Phyllostachys pubescens stands or mixed P.pubescens stands with broadleaved trees by means of fixed monitoring in Luxi and Jianshan forest region,Fuyang County,Zhejiang Province.ANOVA results showed that the dry weight of litter in non-reclamation P.pubescens stands was higher than reclamation pure P.pubescens stands while it significantly reduced after reclamation.It indicated that the average dry weight of litter in non-reclamation P.pubescens stands was 2.13～2.46 times the size of reclamation stands in winter or summer,while that in mixed bamboo stands was 3.07～3.65 or 1.79～2.27 times the size 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 pure and mixed P.pubescens stands were as follows:N,Ca,K,Mg,P,whereas the order of nutrient content or storage of litter in winter or summer in reclamation pure stands were as follows:Ca,K,N,P,Mg.Nutrient content of litter in reclamation bamboo stands ranged 0.2～5.1 g·kg^-1 while nutrient storage from 0.51 to 22.46 kg·hm^-2,nutrient content of non-reclamation bamboo stand ranged 0.29～19.81 g·kg^-1 while nutrient storage from 2.11 to 57.29 kg·hm^-2 and it ranged 0.52～19.89 g·kg^-1 while nutrient storage from 3.74 to 236.37 kg·hm^-2 in mixed bamboo stands.Therefore it must be pay sufficient attention to soil management for reclamation can restrict improving potential soil fertility as greatly reduced amount of litter on surface in bamboo stands although it can improve soil structure and moisture condition.

Key words: Phyllostachys pubescens stands, litter, reclamation, nutrient content, nutrient storage