宁夏白芨滩国家级自然保护区地表甲虫群落边缘效应研究-应用昆虫学报.doc

荒漠景观地表甲虫群落边缘效应研究 王巍巍，贺达汉1，张大治2* （宁夏大学农学院，宁夏，银川 750102宁夏，银川 750021）边缘类型荒漠草原人工柠条林荒漠草原距离梯度形式边缘效应6760头，分属于19科68种，其中样地Ⅰ采集到2045头，样地Ⅱ采集到4715头。统计发现，拟步甲科昆虫占样地Ⅰ的70.46%、样地Ⅱ的81.91%，是该地区地表甲虫中的绝对优势类群。边缘类型Ⅰ中，边缘生境地表甲虫的物种数、优势度指数以及丰富度指数均高于相邻生境内部核心区域，而其均匀度指数和多样性指数则低于人工固沙柠条林核心生境。边缘类型Ⅱ中，边缘生境地表甲虫的物种数、丰富度指数以及多样性指数均高于相邻生境的内部核心区域。边缘效应强度分析表明，边缘类型Ⅰ的EH’ =0.9958，EC=1.1391，呈负的边缘效应，但负效应很弱，边缘类型Ⅱ的EH’ =1.1394，EC=0.5994，呈正的边缘效应，这一结果与边缘地带的环境复杂性和生境异质性有关。 关键词：地表甲虫；边缘效应；群落多样性；荒漠景观；白芨滩国家级自然保护区 Study on the edge effect of ground-dwelling beetles communities in desert landscape WANG Wei-wei1，HE Da-han1，ZHANG Da-zhi2* (1．Agricultural School，Ningxia University，Yinchuan 750021 China；2．Life Science School，Ningxia University，Yinchuan 750021 China) Abstract：In this paper, two typical edge types of the Ningxia Baijitan National Nature Reserve: desert steppe - artificial sand-fixation of Caragana korshinskii forest edge (edge typeⅠ) and desert steppe - fixed semi-fixed sandy edge (edge typeⅡ) are both as the research object, setting sample points in the form of a distance gradient (25 meters), and beetles were collected mainly with pitfall traps in order to explore the impact of the edge effect to their ground-dwelling beetles community diversity. A total of 6760 beetles were collected in this study, these beetles belonging to 19 families and 68 species, plot Ⅰcollected 2045 beetles and plotⅡcollected 4715 beetles. Tenebrionidae comprised 70.46% in plotⅠ and 81.91% in plotⅡ, Tenebrionidae are considered as absolute dominant group in this region. In edge typeⅠ, Species number, Dominance(C) and Richness(D) of ground-dwelling beetles live in marginal area are both higher than that live in core area of adjacent habitats, but Evenness(J) and Diversity(H′) of ground-dwelling beetles living in marginal area are both lower than that living in core area of artificial sand-fixation of Caragana korshinskii forest. In edge typeⅡ, Species number, Richness(D) and Diversity(H′) of ground-dwelling beetles living in marginal area a