生态学杂志2011，Vol.30Issue(8)：1598-1603,6.
毛竹凋落叶组成对叶凋落物分解的影响
Effects of different proportion mixed Phyllostachys pubescens leaf litter on litter decomposition in P.pubescens forest
摘要
Abstract
Mixed Phyllostachys pubescens forest has high productivity and good ecological functions, which is possibly related to the nutrient return characteristics of mixed litter. By using litterbag method, a one-year experiment was conducted to study the decomposition characteristics of different proportion mixed P. pubescens leaf litters in P. pubescens forest in the Yangkou National Forest Farm, Fujian Province of Southeast China. Five treatments were installed, i. e. , pure P. pubescens leaf litters ( Ⅰ ) , P. pubescens＋Phoebe bournei litters ( mass ratio 8:2, Ⅱ ) , P. pubescens＋Cunninghamia lanceolata litters ( 8 :2, Ⅲ ) , P. pubescens ＋P. bournei litters (5 :5 , Ⅳ ) , and P. pubescens＋C. lanceolata litters (5 :5, Ⅴ ) . The litter decomposition rates of different treatments were all compatible with the exponential decomposition model of Olson ( R2 ＞0. 92 , P＜0. 01). The decomposition rate in treatments Ⅰ and Ⅱ was significantly higher than that in other treatments, and the coefficient of decomposition was in the order of Ⅱ ＞ Ⅰ ＞ Ⅲ ＞ Ⅴ ＞ Ⅳ , being 0. 68 , 0. 66, 0. 58, 0. 55 , and 0. 49 , respectively, which illustrated that only appropriate proportions of mixed tree species leaf litters could promote the litter decomposition. The litter of mixed bamboo-broadleaved forest had higher decomposition rate than that of mixed bambooconifer forest. Therefore, the mixed bamboo-broadleaved forest could benefit the persistent productivity of bamboo forest. During decomposition, the N, P, and K in the litters had different release patterns. The N followed the pattern of alternate enrichment and release; the P was rapidly enriched in the first four month, released from the fourth month to fifth month, and then enriched; the K was released in the first three months, and then enriched. The nutrient return of the litters was closely related to the nutrient contents of the litters. The litter C/N ratio and P content could be the key indices for the litter decomposition.关键词
毛竹/混合凋落叶/凋落物分解/养分释放模式Key words
Phyllostachys pubescens/ mixed leaf litter/ litter decomposition/ nutrient release pattern .分类
农业科技引用本文复制引用
刘广路,范少辉,官凤英,杜满义,郭宝华..毛竹凋落叶组成对叶凋落物分解的影响[J].生态学杂志,2011,30(8):1598-1603,6.基金项目
国家"十一五"科技支撑(2006BAD19B0302)、林业公益性行业科研专项(200904047)和竹藤中心基本科研业务专项(1632010005)资助. （2006BAD19B0302）
