喀斯特城市杨树人工林生态系统生物量的层次结构  

Structure of ecosystem biomass in karst urban poplar plantations

作　　者：王新凯[1,2] 田大伦[1,3] 闫文德[1,4] 宁晓波 邓湘雯[1,4] 梁小翠[1,3] 李树战[1,4] 

机构地区：[1]中南林业科技大学,湖南长沙410004 [2]国家林业局,北京100714 [3]南方林业生态应用技术国家工程实验室,湖南长沙410004 [4]国家野外科学观测研究站,湖南会同418307 [5]贵州省林业厅,贵州贵阳550001

出　　处：《中南林业科技大学学报》2011年第5期13-18,共6页Journal of Central South University of Forestry & Technology

基　　金：国家林业公益性行业科研专项(201104009);国家野外科学观测研究站项目(2010-05);国家林业局项目(201042);教育部新世纪优秀人才支持计划项目(NCET-10-0151);湖南省科技厅项目(2010TP4011-3);湖南省教育厅项目(湘财教字[2010]70号);长沙市科技局创新平台项目(K1003009-61)

摘　　要：采用现场实测的方法,对喀斯特城市——贵阳市的杨树人工林生态系统不同层次的生物量进行了研究。结果表明:25年生杨树单株生物量为189.50kg,以树干生物量最高,占林木总生物量的57%;林分生物量为105.36t.hm-2,地上部分生物量为88.01t.hm-2,占林分总生物量的83.5%;林分生产力为12.12t.hm-2a-1,各器官生产力大小排序为树叶>树干>树根>树皮>树枝,树叶生产力最高,为8.24t.hm-2.a-1,占林分总生产力的68%;林下灌木层生物量为7 264.13kg.hm-2,以油茶生物量最高,为2 549.52kg.hm-2,占灌木层总生物量的35%;草本层生物量为556.49kg.hm-2,以白茅最多,生物量为213.06t.hm-2,占草本层生物量的38%;死地被物层生物量为5 733.52kg.hm-2,以未分解层生物量最多,为2 434.14kg.hm-2,占死地被物层总生物量的42%。研究结果可为喀斯特城市森林改善生态环境、碳平衡准确计量及森林保护提供科学依据。Biomasses in different layers of Karst urban poplar plantations were investigated in Guiyang city.The results show that average biomass of individual trees was 189.50 kg in poplar trees（25-year-old）,of which stem biomass was the highest that accounted for 57% of the total biomass of individual trees.The mean stand biomass was 105.36 t·hm-2 in poplar forests,of which aboveground biomass（88.01 t·hm-2） accounted for 83.5% of the total biomass.Stand productivity was 12.12 t·hm-2a-1 in poplar forests.The productivity in different organs of poplar trees was in an order of leaf stem root bark branch,and leaf productivity（8.24 t·hm-2a-1） accounted for 68% of the total productivity.Biomass in shrub layer was 7 264.13 kg·hm-2,of which Camellia oleifera biomass（2 549.52 kg·hm-2） was the highest that accounted for 35% of the total biomass in shrub layer.Biomass in herbivorous layer was 556.49 kg·hm-2,of which Imperata cylindrica biomass（213.06 t·hm-2） was the highest that accounted for 38% of the total biomass in herbivorous layer.Biomass in dead litter layer was 5 733.52 kg·hm-2,of which non-decomposed part（2 434.14 kg·hm-2） was the highest that accounted for 42% of the total biomass in dead litter layer.The results provide scientific basis for improving eclogical environment of Karst urban forest,accurately measuring carbon balance and protecting forest.

关 键 词：喀斯特 城市森林 生态系统 生物量 生产力 

分 类 号：S792.11[农业科学—林木遗传育种]