生态学报2017，Vol.37Issue(2)：513-522,10.DOI:10.5846/stxb201507161501
马尾松人工林林窗大小对四种凋落叶质量损失和养分释放的影响
Effects of forest gap size on leaf litter weight loss and nutrient release of four species in Pinus massoniana plantations
摘要
Abstract
Litter decomposition is an essential component of the nutrient balance and material cycling in Pinus massoniana plantations.Forest gap size could play an important role in litter decomposition due to its effects on the microenvironment.To evaluate the effects of forest gap size on leaf litter mass loss and nutrient release of four native species (Toona ciliata,Phoebe zhennan,Cinnamomum camphora,Pinus massoniana),a field experiment consisting of seven gap sizes (i.e.,G1:100 m2,G2:225 m2,G3:400 m2,G4:625 m2,G5:900 m2,G6:1225m2,and G7:1600 m2) was established in 2013.The results showed that:1) Forest gap size significantly affected leaf litter mass loss of C.camphora,but not the mass loss of the other three species.The litter nutrient release rate at the gap center for T.ciliata (N,P),P.zhennan (N,P),C.camphora (N,P,K) and P.massoniana (P,K) were significantly influenced by forest gap size.Furthermore,leaf litter mass loss rate,and N and P release rates were significantly higher in small and medium sized gaps (G1-G4) than in large gaps (G5-G7) (P＜0.05).However,litter K release rates were significantly lower in small and medium sized gaps (G1-G4) than in the larger gaps (P＜0.05).2) The leaf litter collection location in the forest gaps influenced the litter K release rate of T.ciliata,P.zhennan,and P.massoniana.The K release rate of T.ciliata and P.zhennan litter at the gap centers were significantly higher than those at the gap edges (P＜0.05).In contrast,P release rates of C.camphora litter and K release rates of P.massoniana litter at the gap center were significantly lower than rates at the gap edges (P＜0.05).3) Litter mass loss and nutrient release rates of T.ciliata were the highest among the four species.According to the fitting equation,the 50％ and 95％ decomposition times for T.ciliata were 5.29 and 23.14 months,respectively.Overall,forest gap size and litter sampling location in the gaps significantly affected litter mass loss and nutrient release.However,the extent of these effects and dynamic changes depended on the initial litter quality.These results can be beneficial for the scientific management of P.Massoniana plantations in low mountainous and hilly areas of subtropical zones.关键词
林窗面积/马尾松人工林/失重率/养分淋溶/凋落叶特征Key words
forest gap size/Pinus massoniana plantations/mass loss rate/nutrient leaching/leaf litter traits引用本文复制引用
刘华,张丹桔,张健,杨万勤,李勋,张艳,张明锦..马尾松人工林林窗大小对四种凋落叶质量损失和养分释放的影响[J].生态学报,2017,37(2):513-522,10.基金项目
国家自然科学基金项目(31370628) （31370628）
国家科技支撑计划项目(2011BAC09B05) （2011BAC09B05）
四川省科技支撑计划项目(12ZC0017) （12ZC0017）
四川省科技厅应用基础项目(2012JY0047) （2012JY0047）
四川省教育厅科技创新团队计划项目(11TD006) （11TD006）
