【摘要】 以中国和蒙古小针茅荒漠草原为研究对象,对植物功能群群落平均高度、盖度、重要值、物种数、多样性及生态位进行研究。结果表明:定居放牧方式下多年生群落平均盖度和重要值低于蒙古四季游牧,1年生群落平均盖度和重要值高于四季游牧;定居放牧1年生草本植物、灌木比例均显著高于四季游牧。2种放牧方式下旱生植物比例均占主要地位,且四季游牧旱生植物比例(77.1%)低于定居放牧(78.6%)。四季游牧生活型和水分生态型功能群Shannon指数和Simpson指数均高于定居放牧,而Pielou指数低于定居放牧。Shannon指数和Simpson指数之间均存在显著正相关;Pielou指数与Shannon指数、Simpson指数间存在负相关。一年生草本植物和多年生草本植物生态位宽度较高,生态位重叠值为0.965;旱生和中旱生植物生态位宽度分别为0.999、0.987,生态位重叠值为0.985。更多还原

【Abstract】 In this paper,we studied the characteristics of plant functional groups in Stipa klemenzii desert steppe in China and Mongolia,including community average height,coverage,importance value,species number,diversity and ecological niche. Results showed that the average coverage and importance value of perennial community were lower under the settled grazing than under four-season nomadic grazing,while the average coverage and importance value of annual community were opposite. The proportions of annual plant and shrub were significantly higher under the settled grazing than under four-season nomadic grazing. Moreover,xerophytes dominated in the community and the proportion of xerophytes was lower under the four-season nomadic grazing( 77. 1%) than under the settled grazing( 78. 6%). However,compared with the settled grazing,both Shannon and Simpson indexes were higher while Pielou index was lower in life form and ecological functional groups under the four-season nomadic grazing. There was a significant positive correlation between Shannon and Simpson indexes,and Pielou index had a negative correlation with Shannon and Simpson indexes,respectively. Niche breaths of annual and perennial plants were higher,with a niche overlap of 0. 965; niche breaths of xerophytes and mesoxerophytes were 0. 999 and 0. 987,respectively,with a niche overlap of 0. 985.更多还原