摘要
采取分层取样法，对石羊河上游阿尔泰狗哇花十阿尔泰针茅型和火绒草十阿尔泰针茅型两种退化草地群落特征进行了分析。结果表明，（1）两种毒杂草型草地物种丰富度之间没有显著差异，但群落数量结构及群落成员型明显不同：阿尔泰狗哇花十阿尔泰针茅型草地中，阿尔泰狗哇花占优势地位，阿尔泰针茅次之；多年生杂类草盖度和植物量高于禾本科牧草；地下植物量自表层向下依次减小，且主要集中在0～20cm土层。火绒草十阿尔泰针茅型草地，火绒草占优势地位，阿尔泰针茅次之；地下植物量变化趋势同阿尔泰狗哇花十阿尔泰针茅型草地。（2）两种退化草地群落功能型发生明显变化，表现为禾草：杂类草比例与原生植被相比明显倒置。（3）两种退化草地总盖度略高于原生植物群落，差异不显著，但地上植物量明显高于原生植物群落。
The differences between two types of degraded grassland （Heteropappus altaicus ＋ Stipa krylovii degraded grassland and Leontopotium leontopodioides＋Stipa krylovii were studied. The results showed that. （1） the function of the forbs was increased while S. krylovii decreased in each community. （2）There was no significant difference in the total underground phytomass between two degraded grasslands types, but the underground phytomass was different in each layer between the two communities; （3） There was no significant difference in total coverage,but the total aboveground phytomass was higher than the native vegetation community.
出处
《草原与草坪》
CAS
2007年第4期23-26,共4页
Grassland and Turf
关键词
石羊河上游
退化草地
植物群落特征
upper Shiyang River
degraded grassland
plant community characteristics
