摘要
以三江源区围栏封育5a、10a和自由放牧的高山嵩草草甸为研究对象,对样地内的地上生物量和群落特征的研究结果表明:围栏封育区物种丰富度、物种多样性及生态优势度指数低于自由放牧区,群落结构较自由放牧简单,而均匀度指数高于自由放牧,说明长期围栏封育使群落向均一化方向发展,群落稳定性高于自由放牧草场;可采食的优良牧草生物量及其比例增加,总体趋势是随围栏封育年限增加禾草类生物量围栏内>围栏外,杂类草生物量围栏内<围栏外。
The three headwaters fenced for 5a,10a and free grazed in Kobresi apygmaea meadow were as the research object,the above ground biomass and community characteristics were studied.The results showed that：the species richness,diversity and dominance under fencing were lower than that under free grazing,the structure of community under fencing was simpler than that under free grazing,however evenness under fencing was higher that that under grazing,which showed that long-term fencing made the community homogenization,community stability was higher than that under free grazing,the fine herbage biomass and proportion were increased,and with the increase of enclosure years,the overall trend was that the grass biomass in fencing area was greater than that in grazing area,the forbs biomass smaller than that in grazing area.
出处
《中国草地学报》
CSCD
北大核心
2014年第3期67-72,共6页
Chinese Journal of Grassland
基金
国家自然科学基金重点项目"我国北方草原区气候变化适应性评价及其管理对策研究"(70933004)
国家科技支撑项目"重点牧区草原‘生产生态生活’配套保障技术及适应性管理模式研究"(2012BAD13B07)
青海省自然科学基金项目"三江源区高寒草甸土壤呼吸时空变异特征的研究"(2012-Z-941Q)
中央级公益性科研院所基本科研业务专项(中国农业科学院草原研究所)农业部玉树高寒草原资源与生态环境重点野外科学观测站项目"青藏高原高寒草甸合理利用研究--三江源高寒草甸退化机理研究"(1610332013014)
关键词
群落特征
围栏封育
物种多样性
高山嵩草草甸
三江源区
Plant community characteristics
Fencing
Plant community diversity
Kobresia pygmaea meadow
The three headwaters
