林业科学Issue(9)：1-8,8.DOI:10.11707/j.1001-7488.20150901
根系去除对米老排和杉木凋落物分解的影响
Effect of Root Removal on Litter Decomposition in Plantations of Mytilaria laosensis and Cunninghamia lanceolata
摘要
Abstract
[Objective]We investigated the decomposition process of leaf litter and its responses to root removal in Mytilaria laosensis and Cunninghamia lanceolata plantations. The aim was to determine the effect of fine root removal on leaf litter decomposition.[Method]Our experimental site is located at Xiayang Forest Farm,in Nanping,Fujian,China, where a M. laosensis plantation and a C. lanceolata plantation were selected. Three 20 m × 20 m plots were established in each plantation. A treatment with root trenched and a control were established in each plot. Decomposition of leaf litter was measured by litter-bag method.[Result]The mass loss rates of M. laosensis and C. lanceolata leaf litter of the root trenched treatment were 32. 3% and 33. 4% after 16-month decomposition,reduced by 15. 3 % and 13. 1% compared to the control (38. 1% and 38. 7%) respectively. There were significant effects of tree species,treatment,duration of decomposition. Species by treatment interactions on mass loss rate of leaf litters. There were significant differences in mass loss rate of leaf litter between the two tree species (P<0. 05) during the first 8 months,but no differences during last 8 months. Root trenching significantly reduced the contents of C and N and C/N ratio in leaf litters of the two tree species, it also significantly reduced soil fungi biomass,actinomycetes biomass and total PLFA content,but it had no significant impacts on soil gram-positive bacteria biomass and gram-negative bacteria biomass. There were no significant species by treatment interactions in mass loss rates and C/N ratio of leaf litters,and soil microbial community. [Conclusion]These observations suggested that the effect of root trenching was significant on decomposition of leaf litter,but the species by treatment interaction was not significant.关键词
凋落物分解/微生物群落/根系去除/米老排/杉木Key words
litter decomposition/microbial community/root trenched treatment/Mytilaria laosensis/Cunninghamia lanceolata分类
农业科技引用本文复制引用
刘瑞强,黄志群,何宗明,万晓华,余再鹏,郑璐嘉,肖好燕..根系去除对米老排和杉木凋落物分解的影响[J].林业科学,2015,(9):1-8,8.基金项目
教育部新世纪优秀人才支持计划(DB－168) （DB－168）
福建省杰出青年科学基金项目(2060203)。 （2060203）
