柳杉人工林皆伐后初期土壤有机碳和微生物量碳动态  

Soil Organic Carbon and Microbial Biomass Carbon Dynamics of the Clear-cut Cryptomeria Plantation

作　　者：鲁洋[1,2] 黄从德[1] 董刚明[2] 兰立达[2] 王旭 

机构地区：[1]四川农业大学林学院,四川雅安625000 [2]四川省林业调查规划院,四川成都610000 [3]雅安市林业局,四川雅安625000

出　　处：《四川林业科技》2010年第5期35-40,共6页Journal of Sichuan Forestry Science and Technology

基　　金：教育部新世纪优秀人才支持计划项目(NCET-07-0592);国家"十一五"科技支撑项目(2006BAC01A11)

摘　　要：本文研究了华西雨屏区柳杉人工林皆伐后1年内土壤有机碳和微生物量碳动态。结果表明：柳杉人工林皆伐林地土壤平均有机碳含量比对照（未皆伐林地）减小2．01gC·b^-1，但差异不显著，而土壤平均有机碳储量及微生物量碳分别比对照减少20．97tC·hm^-1、6．68mg·kg^-1（P〈0．05）；皆伐林地土壤有机碳含量及微生物量碳均随季节的变化而逐渐降低，但有机碳储量随季节的变化无明显减少趋势；皆伐林地土壤四季的有机碳含量、碳储量和微生物量碳差异不显著。皆伐对柳杉人工林土壤有机碳储量的影响主要表现在0-20cm土层（P〈0．05）；皆伐林地和对照在0～40cm土层的微生物量碳和有机碳含量都表现出显著相关性（P〈0．05），但对照的相关性高于皆伐林地。总之，柳杉人工林转变为采伐迹地后，其初期土壤有机碳储量和微生物量碳都明显减少。In this paper, studies were made of soil organic carbon and microbial biomass carbon dynamics in the plantation of Cryptomeria in Huxi Yuping District within one year after clear cutting. The results showed that： the average soil organic carbon content in the clear-cutting soil of Cryptomeria plantation forest decreased by 2. 01 gC · kg^-1 than the control （unclear-cutting forest land） ,but the difference was not significant, while the average soil organic carbon and microbial biomass carbon decreased by 20. 97 tC ·hm^-2 and 6. 68 mg ·kg^-1 （p 〈 0.05） than the control;The organic carbon content and microbial biomass carbon in the clear-cutting of forest soil decreased along with changes of the seasons but the organic carbon stock with changes of the seasons did not display a significant decreasing trend;in the four seasons, the differences of organic carbon content, carbon storage and microbial biomass C in the clear-cutting forest soil were not significant. The effect of clear cutting on organic carbon storage was mainly found in the 0 -20 cm soil layer （P 〈 0. 05） ;Microbial biomass carbon and organic carbon content in the 0 -40 cm soil clear cutting forests and the control showed a significant correlation （ P 〈 0.05 ）, but the control＇s correlation was higher than clear-cutting forests＇. In short, after the Cryetomeria plantation was changed into cut-over sites, the initial soil organic carbon storage and microbial biomass C content had significantly reduced.

关 键 词：柳杉人工林 皆伐 土壤有机碳 土壤微生物量碳 

分 类 号：S714[农业科学—林学]