摘要
采用群落学方法,对围封和放牧大针茅群落立枯的高度、密度、物种多样性、现存量及碳储量进行调查测定,研究大针茅群落立枯动态特征。结果表明:(1)从生长季结束时起,经过秋-冬非生长季到次年夏季,随着季节推移大针茅群落立枯的密度和高度均逐渐降低,且放牧群落立枯的密度和高度显著低于围封群落。(2)随着季节推移,大针茅群落立枯物种多样性呈现降低趋势,导致非生长季大针茅群落物种丰富度降低,且放牧群落立枯的丰富度和物种多样性均低于围封群落。(3)随着季节推移,大针茅群落立枯的现存量明显降低,且放牧群落立枯的现存量显著低于围封群落。(4)生长季结束时,围封和放牧的大针茅群落立枯储碳量分别为0.46t/hm2和0.07t/hm2,放牧显著降低大针茅群落立枯碳储量。
The dynamics of standing dead in a Stipa grandis community were investigated using phytocoenology methods.Field data including height,density,diversity and biomass of standing dead were collected.The results indicated that： 1） From the end of growing season to summer of next year,the height and density of standing dead in the S.grandis community decreased gradually along the time,and significant decreases were found in the height and density of standing dead in grazed sites.2） Species diversity of standing dead in the community tended to decrease with the time,which resulted in the lower richness of the community in non-growing season.In addition,richness and species diversity of standing dead were found to decrease in the grazed sites.3） The standing dead biomass of the community decreased apparently along the time,and significant decreases were found in standing dead biomass in grazed sites.4） The storage of carbon in the S.grandis community of fenced and grazed sites were 0.46t/hm2 and 0.07t/hm2 respectively in the end of the growing season,and grazing led to the significant decreases of the storage of carbon.
出处
《中国草地学报》
CSCD
北大核心
2013年第4期110-115,共6页
Chinese Journal of Grassland
基金
国家科技支撑计划项目(2011BAC07B00)
农业部"国家牧草现代产业技术体系"项目(CARS-35)
关键词
大针茅群落
立枯特征
放牧
围封
Stipa grandis community
Characteristics of standing dead
Grazing
Fencing
