青藏高原东缘珠芽蓼+线叶嵩草草地植物群落组成及生产力动态监测

对青藏高原东缘珠芽蓼+线叶嵩草草地3年的定位监测研究表明:该草地群落主要以杂类草组成,杂类草占草群密度的89.6%,是高山带典型的杂类草草甸草地,群落共有植物104种,分属18科48属,珠芽蓼、线叶嵩草为优势种,草群构成中,珠芽蓼所占比例最大,在5.7~13.4,且随生育期的延伸呈逐步上升趋势,在整个草群地上植物量的变化中,珠芽蓼处于主导地位,它的增减变化决定其他类草比率的升降。草地生产力月动态变化呈单峰形曲线,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(167.24g/m2)。全年单位面积载牧量(羊单位)为1.833个/hm2,青草期月理论载牧量(羊单位个/hm2)分别为:5月5.3个,6月11.0个,7月17.8个,8月21.6个9月17.3个,10月11.3个。

Dynamic monitoring of plant community composition and productivity of Polygonum viviparum and Kobresia capillifolia rangeland on Qinghai-Tibetan Plateau

Dynamic monitoring studies on Polygonum viviparum Kobresia capillifolia rangeland on Tibetan Plateau for 3 years showed that it mainly consists of forbs,and is typical forbs meadow rangeland.There were 104 species in it community,and they belonged to 18 families and 48 genus,and Polygonum viviparum and Kobresia capillifolia were dominant species.In community composition,the proportion of Polygonum viviparum was the highest(about 5.7% to 13.4%) and it increased along with the growing stage.In whole aboveground phytomass,Polygonum viviparum played an important role.Monthly change tendency of grassland productivity showed a single peak curve and the aboveground phytomass mainly increased in June and July,the highest grass yield was obtained in August(167.24 g/m~(2)).The annual carrying capacity(sheep unit) was 1.833 per hectare.