青藏高原东缘短柄草—密生苔草草地植物群落组成及生产力的季节动态研究  

Study on the dynamic of the structures of plant species and the primary productivity on Brachypodium sylvaticum-Carex crebra grassland in eastern border of Qinghai-Tibet Plateau

作　　者：张苏琼[1] 赵忠[2] 王安禄 

机构地区：[1]甘肃农业大学草业学院,甘肃兰州730070 [2]甘肃省畜牧科技开发中心,甘肃兰州730030 [3]甘肃省碌曲县畜牧局,甘肃碌曲747200

出　　处：《草业科学》2005年第5期14-18,共5页Pratacultural Science

摘　　要：通过对青藏高原东缘短柄草Brachypodium sylvaticum-密生苔草Carex crebra草地2年的定位监测研究,结果表明:该草地共有植物 70 种,分属 20 科 46 属.短柄草是优势种,占草群密度的45.5%;密生苔草为亚优势种.从地上植物量来看,短柄草产量在各月均居首位,所占比率为14%～29%,密生苔草占5.4%～16%.草地生产力月动态变化曲线呈单峰形,6-7月是地上植物量增长最快的时期,产量高峰出现在8月(217.9 g/m2).全年单位面积载畜量为2.388个羊单位/(hm2*年),青草期5-10月各月理论载畜量分别为:4.6,9.3,17.4,28.1,21.2,11.6个羊单位/hm2.Dynamics of the structures of plant species and the primary productivity was monitored and measured during continuous 2 years on Brachypodium sylvaticum-Carex crebra grassland in eastern border of Qinghai-Tibet Plateau. There were 70 species of plant belong to 20 families, 46 genus. The species of Brachypodium sylvaticum was the most of them, the community density of it accounted for total community density of herbage was 45.5%. The above ground biomass of it were also the most in each month, which is 14%～29%,secondary Carex crebra was 5.4%～16%. The best time of the above ground biomass accumulation was June to July. However, the top yield is appeared in August(217.9 g/m 2). The above ground biomass of herbage increased firstly and then decreased later. Grazing capacities 2.388 sheep unit/(hm 2·a). Grazing capacities of theory during herbage growth terms, May, 4.6 sheep unit/hm 2, June, 9.3 sheep unit/hm 2, July, 17.4 sheep unit/hm 2, August,28.1sheep unit/hm 2, September21.2 sheep unit/hm 2, October,11.6 sheep unit/hm 2.

关 键 词：短柄草-密生苔草草地 群落组成 生产力 动态研究 

分 类 号：S812[农业科学—草业科学]