山西南部地木耳群落特征及其资源分布的研究

STUDIES ON THE COMMUNITY FEATURE AND RESOURCE DISTRIBUTION OF NOSTOC COMMUNE IN THE SOUTHERN SHANXI PROVINCE

采用样方法对不同生境中地木耳分布规律进行了研究；分析了地木耳的群落特征及其生物量，结果表明：①群落种类组成，共有３８种，３４属，２１科，单科单种１４种；②群落垂直结构简单，只有灌木层、草本层和地被层；③地木耳平均生物量为１０ｋｇ／ｈｍ２，干重７．３ｋｇ／ｈｍ２，湿重１４０ｋｇ／ｈｍ２；④地木耳的自然含水量４２％，持水量１８．６％，在海拔６００～８００ｍ之间，地木耳生物量最大；⑤地木耳与白羊草、针茅的分布具有一致性。

The distrbution regularity of Nostoc commune in different living environments was studied by using the plot method.The community feature and biomass of the Nostoc commune community were analyzed.The results showed:(1) the specific composition of Nostoc commune community is 38 species,34 genera,21 families and 14 mon family mon species;(2) the vertical structure of the community is the shrub layer and grass layer and cover plant layer;(3) average biomass of it is 10 kg/hm 2,and dry weight 7 3 kg/hm 2 and wet weight 140 kg/hm 2;(4) natural water content of it is 42% and water holding capacity 18 6%.The biomass is the largest in altitude 600￣800 m;and (5) Nostoc commune consists with Bochriobloa ischaemum and Stipa in the distribution.