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

作　　者：刘瑞强[1,2,3] 黄志群[1,2,3] 何宗明[4] 万晓华[1,2,3] 余再鹏[1,2,3] 郑璐嘉 肖好燕 

机构地区：[1]湿润亚热带山地生态国家重点实验室培育基地,福州350007 [2]福建师范大学地理研究所,福州350007 [3]湿润亚热带生态地理过程教育部重点实验室,福州350007 [4]福建农林大学林学院,福州350002

出　　处：《林业科学》2015年第9期1-8,共8页Scientia Silvae Sinicae

基　　金：教育部新世纪优秀人才支持计划(DB-1 68);福建省杰出青年科学基金项目(2060203)

摘　　要：[目的]研究米老排和杉木凋落叶分解及其对根系去除的响应,探索根系对凋落物分解的影响,从而为森林经营管理提供科学依据。[方法]以福建南平峡阳林场米老排和杉木人工林为研究对象,在各个林分中分别设置3个20 m×20 m的试验小区,在每个试验小区各设置对照和根系去除处理。利用网袋法研究凋落叶的分解。[结果]分解16个月后,根系去除处理下米老排和杉木凋落叶的质量损失率分别为32.3%和33.4%,与对照处理（38.1%和38.7%）相比,分别降低了15.3%和13.1%;树种、处理、时间、树种与时间的交互效应对凋落叶质量损失率均有显著影响,2种凋落叶的质量损失率在分解初期（0～8个月）差异显著,分解后期（8～16个月）差异不显著;根系去除处理可显著降低2个树种凋落叶的碳氮含量和碳氮比、显著降低土壤真菌、放线菌和总PLFA含量,但对革兰氏阴性细菌、革兰氏阳性细菌和真细菌生物量比均无显著影响;树种与处理的交互效应对凋落叶质量损失率、碳氮比和土壤微生物群落均无显著影响。[结论]根系去除处理对凋落叶分解速率具有显著影响,但树种与处理的交互效应不显著。[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＆amp;nbsp;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 

分 类 号：S714.5[农业科学—林学] S750