林业科学2012，Vol.48Issue(2)：31-37,7.
不同立地条件下华北落叶松叶凋落物的分解特性
Decomposition Characteristics of Coniferous Litter under Different Site Conditions in a Larix principis-rupprechtii Plantation
摘要
Abstract
The litter bag method was used to investigate the differences in dynamic weight loss rate, leaf litter decomposition rate and substrate quality of a Larix principis-rupprechtii plantation under different mountain site conditions in Beijing. The results showed that elevation and slope were two main factors in determining the site difference ( Site class Ⅲ , Ⅳ). There were two peaks for leaf weight loss rate under two site conditions during the one-year observation. T0.5 in Ⅲ and Ⅳ was 2. 57 and 2. 67 years, and t0. 95 was 11. 09 and 11. 24 years, respectively. The average annual weight loss rate, the decomposition rate and initial inorganic nutrient content in HI were higher than in IV. Compared with IV , the average C/N value and lignin content in IE were more benefit to the decomposition of coniferous litter. The initial inorganic nutrient content of litter was not significantly different between two site conditions, while the initial content of C and lignin existed significant ( P < 0. 05 ) difference. Correlation analysis showed that there were significantly negative correlations between litter decomposition rate and total carbon, C/N ratio and litter layer thickness, and the correlation coefficients were - 0. 735 , - 0. 569 and - 0. 758 , respectively. Substrate quality indexes indicated that the forest density of 1 675 tree . Hm-2 was most favorable to litter decomposition in Ⅲ site condition, while the density in 1 300 tree . Hm-2 was the most beneficial to decomposition of coniferous litter in the IV site condition.关键词
华北落叶松/人工林/凋落物/立地条件/分解速率Key words
Larix principis-rupprechtii/plantation/litteri/site conditions/decomposition rate分类
农业科技引用本文复制引用
吕瑞恒,李国雷,刘勇,贾黎明,江萍,林娜..不同立地条件下华北落叶松叶凋落物的分解特性[J].林业科学,2012,48(2):31-37,7.基金项目
国家自然科学基金(30972353) （30972353）
高等学校博士学科点专项科研基金(20090014110011) （20090014110011）
北京市教育委员会学科建设与研究生教育建设项目(CXYBL2008-2010). （CXYBL2008-2010）
