宁夏贺兰山斑子麻黄荒漠群落特征

斑子麻黄(Ephedra rhytidosperma)群落是贺兰山山麓特有荒漠植物群落。该研究于2019年调查了16个斑子麻黄典型群落, 分析了物种组成的区系特征, 运用TWINSPAN软件对16个斑子麻黄群落进行了分类。结果表明: 1)斑子麻黄群落物种组成以禾本科、菊科、豆科和蒺藜科植物为主, 隶属13科24属27种。2)斑子麻黄荒漠群落生活型以多年生草本(44.44%)和灌木(29.63%)为主; 区系以古地中海成分(44.44%)和东亚成分(33.33%)为主; 水分生态类型以旱生(40.74%)和强旱生(37.04%)为主。3)根据生活型和优势度, 斑子麻黄群落可分为斑子麻黄-半灌木荒漠(Ephedra rhytidosperma - Semi-Shrub Desert)和斑子麻黄-草本荒漠(Ephedra rhytidosperma - Herb Desert) 2个群丛组, 进一步划分为3个群丛: 斑子麻黄-刺旋花-兴安胡枝子 半灌木与草本荒漠(Ephedra rhytidosperma - Convolvulus tragacanthoides - Lespedeza davurica Semi-Shrub and Herb Desert)、斑子麻黄-刺旋花-中亚细柄茅 半灌木与草本荒漠(Ephedra rhytidosperma - Convolvulus tragacanthoides - Ptilagrostis pelliotii Semi-Shrub and Herb Desert)和斑子麻黄-中亚细柄茅 半灌木与草本荒漠(Ephedra rhytidosperma - Ptilagrostis pelliotii Semi-Shrub and Herb Desert)。

Community characteristics of Ephedra rhytidosperma in Helan Mountain of Ningxia,China

Ephedra rhytidosperma is an endemic and endangered plant in East Alxa, and its community is one of the unique desert plant communities in the Helan Mountain. In this paper, we investigated 16 plots of the E. rhytidosperma community in 2019 and analyzed its flora characteristics, applied TWINSPAN to classify community types. Results showed that: 1) The species composition of E. rhytidosperma community was dominated by Gramineae, Compositae, Leguminosae and Zygophyllaceae, belonging to 13 families, 24 genera and 27 species. 2) The main life forms of E. rhytidosperma community were perennial herbs (44.44%) and shrubs (29.63%); the main floristic geographic elements were Palaeo-Mediterranean element (44.44%) and East Asia element (33.33%); the main ecological types of water were xerophyes (40.74%) and super-xerophytes (37.04%). 3) Based on the life forms and species composition, the E. rhytidosperma communities were divided into two major Association Groups. Ephedra rhytidosperma - Semi-Shrub Desert and Ephedra rhytidosperma - Herb Desert, which were further divided into 3 Associations: Ephedra rhytidosperma - Convolvulus tragacanthoides - Lespedeza davurica Semi-Shrub and Herb Desert, Ephedra rhytidosperma - Convolvulus tragacanthoides - Ptilagrostis pelliotii Semi-Shrub and Herb Desert and Ephedra rhytidosperma - Ptilagrostis pelliotii Semi-Shrub and Herb Desert.