摘要
生物量是整个生态系统运行的能量基础和营养物质来源。用直接收获法,对延安康家屹崂沟小流域5个次生灌丛群落类型和2个人工灌丛样地地上部生物量的研究结果表明:地上部生物量黄刺玫>杂灌>虎榛子>柠条(阴坡)>沙棘>狼牙刺>柠条(阳坡);灌木树种组成复杂的、群落盖度较大的类型生物量较大;各类型灌丛生物量在小流域空间分布上阴坡>阳坡,阴坡坡下>坡中>坡上;阳坡灌丛中的草本植物生物量比阴坡高,而灌木生物量较低。所调查的5个次生灌丛群落类型地上部生物量和生产力呈线性相关关系,回归方程Y=3.1995+0.1939X,净生产力随生物量的增加而提高。
Biomass is the basis of the ecosystem functions,and serves as an indicator of ecosystem health.In order to evaluate the natural restoration of vegetation in north Shaanxi,a research was conducted in Yangou watershed,Yanan City on aboveground biomass of 5 types of secondary shrubs and 2 types of man-planted shrubs.The result shows that the higher biomass was found in shrub community with more species and higher cover.The spatial analysis of biomass over the watershed showed that the biomass on north facing slopes is higher than that on south facing slopes.On north facing slopes,the biomass increases from lower parts to upper parts;and it is higher in gully than that in hill ridges.The relation between aboveground biomass and productivity of 5 shrub communities was also established:Y=3.199 5+0.193 9X.
出处
《西北植物学报》
CAS
CSCD
2003年第8期1362-1366,共5页
Acta Botanica Boreali-Occidentalia Sinica
基金
国家"十五"科技攻关项目(2001BA508B17)
中国科学院知识创新项目(KZCX01-06
KZCX1-10)
关键词
次生灌丛
生物量
黄土丘陵区
流域
secondary shrub community
biomass
Loess Hill and Gully Region
small watershed
