摘要:
该文调查了南涧干热退化山地5种人工恢复群落恢复过程中及当地次生植被的土壤种子库的储量、分布格局、组成及其优势成分.研究表明:各样地土壤种子库的储量变化在2060～21300粒/m2之间,物种数为22～32种,各恢复群落的土壤种子库储量和物种数均比当地次生的坡柳、黄茅草灌草坡有增加.在0～10cm土层内,种子库密度垂直分布呈上层（0～2cm）＞中层（2～5cm）＞下层（5～10cm）,层间储量差异明显.从物种和生活型组成来看,各群落草本都占优势,少数植物如菊科的紫茎泽兰、胜红蓟、烟管头草、戟叶火绒草等在土壤种子库中储量丰富,但作为地上草本层的优势物种之一的黄茅草在土壤种子库中的储量却很少.
Abstract:
Through the methods of transect sampling and greenhouse germination trial,the authors examined the storage,distribution pattern,composition and dominant species of soil seed banks of the rehabilitated communities and the local secondary vegetation on degraded mountainous area of dry-hot valley in Nanjian, Southwest China's Yunnan Province.The seed densities in the top soil of 10cm varied between 2060 and 21300 grain per m2,and the number of species identified varied between 22 and 32 among 5 types of rehabilitated communities and the local secondary vegetation.The storage and the species numbers of soil seed banks of the rehabilitated communities greatly increased in comparison with the local secondary vegetation.In the soil samples of 10cm,the result of seed banks was in the order of upper layer (0-2cm) >middle layer (2-5cm) >lower layer (5-10cm),and statistical test of difference of seeds germinating from different soil layers in different community types was significant.In terms of the species composition and life form,herb species dominated the soil seed bank with a higher density and accounted for a high proportion of the soil seed bank.A few species of Asteraceae such as Eupatorium adenophorum,Ageratum conyzoides,Carpesium cernum and Leontopodum dedekensii were dominant in the soil seed bank.But Heteropogon contortus,one of dominant species of the herbaceous layer on the ground,seldom appeared in the soil seed bank.
百度学术
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