雪灾对武夷山毛竹林凋落物分解动态的影响  

Influences of the snow storm on the leaf litter decomposition dynamics of Phyllostachys heterocycla ecosystem in Wuyi Mountain

作　　者：徐涵湄[1] 丁九敏[1,2] 刘胜[1] 卜晓莉[1] 王邵军[1] 汪家社 徐自坤 阮宏华[1] 

机构地区：[1]南京林业大学,江苏省林业生态工程重点实验室,江苏南京210037 [2]连云港职业技术学院,江苏连云港222006 [3]福建武夷山国家级自然保护区管理局,福建武夷山354315

出　　处：《南京林业大学学报（自然科学版）》2010年第3期131-135,共5页Journal of Nanjing Forestry University：Natural Sciences Edition

基　　金：国家自然科学基金项目(30670313);国家林业局林业公益性行业科研专项项目(200804006;200704005/wb02)

摘　　要：为了研究雪灾干扰对森林生态系统物质循环与能量流动的影响,利用大样袋网袋法对武夷山3种程度受灾的毛竹林样地中凋落物的分解进行了连续1a的观测研究。结果显示:毛竹凋落物的分解失重呈先快后慢的趋势,在夏季,不同样地毛竹凋落物分解速率随受灾程度的加重而显著加快,不同受灾样地秋冬两季凋落物分解速率没有显著差异,春季重度受灾竹林分解速率又显著快于中度与轻度受灾竹林。3种样地毛竹凋落物的分解动态符合Olson指数衰减模型,且分解系数k从大到小排序为:重度受灾样地、中度受灾样地、轻度受灾样地。不同受灾竹林凋落物的分解速率均与土壤温度、雪灾输入林地生物量呈显著正相关,与郁闭度呈显著负相关,与土壤湿度不相关。研究表明雪灾加快了森林生态系统的有机物质的分解。In January 2008,an extraordinarily serious snow storm occurred in southern China which had serious disturb-ance and destroy on structure and function of forest ecosystem. We used big litterbag method to study the dynamics of leaf litter decomposition in different damaged level bamboo forests in Wuyi Mountain over one year to learn the influences of snow storm on cycle of substance and energy flow. The result showed that mass loss rate was very quick at the begin-ning,and then slow down. Decomposition rate of leaf litter increased with the damaged level in summer,but there was no difference in autumn and winter. In spring,decomposition rate in heavy level sites become quicker than it in middle and low level sites again. Decomposition dynamics in the different damaged level bamboo forests is accord with Olson model,and leaf decomposition rates （k） followed to order is： heavy level,middle level,low level. The decomposition rate positively correlated with soil temperature,the aboveground biomass loss caused by the snow storm,but negatively correlated with the canopy closure significantly. It didn’t correlate with soil water content. Our findings indicated that snow storm might accelerate litter decomposition rate.

关 键 词：雪灾 毛竹林 凋落物 分解速率 分解模型 武夷山 

分 类 号：S718[农业科学—林学] X43[环境科学与工程—灾害防治]