金沙江干热河谷自然恢复区植物种群生态位特征

金沙江干热河谷自然恢复区植物种群生态位特征 Niche Characteristics of Plant Populations on Natural Restoration Region in Dry-Hot Valley of Jinshajiang River 方海东 FANG Haidong1 1 2 3 4 first-author 段昌群 DUAN Changqun1 1 2 3 4 纪中华 JI Zhonghua2 1 2 3 4 沙毓沧 SHA Yucang2 1 2 3 4 和寿甲 HE Shoujia2 1 2 3 4 杨艳鲜 YANG Yanxian2 1 2 3 4 云南大学生命科学学院 云南大学生命科学学院 School of Life Sciences,Yunnan University School of Life Sciences,Yunnan University 云南省农业科学院热区生态农业研究所 云南省农业科学院热区生态农业研究所 Institute of Tropical Eco-Agriculture Sciences,Yunnan Academy of Agricultural Sciences,Yuanmou Institute of Tropical Eco-Agriculture Sciences,Yunnan Academy of Agricultural Sciences,Yuanmou 云南省农业科学院热区生态农业研究所,云南,昆明,650091 云南省农业科学院热区生态农业研究所,云南,昆明,650091 云南元谋,651300 云南元谋,651300 通过实地调查对金沙江干热河谷自然恢复区植物种群的生态位特征进行了分析研究.结果表明:①18个物种在12个资源位中的重要值变化从75.00% 1 95.83%,其中扭黄茅的重要值平均值为62.79%,车桑子、独穗飘拂草、虱子草等其他13种植物的重要值都少于4.0%.扭黄茅成为该区的优势种群;②扭黄茅生物生态位宽度最大（0.924）,叶下珠、刺芒野古草和孔颖草分别占生态位宽度的17.82%,7.67%和7.40%,其他物种的生态位宽度在0.04 0 .29之间,重要值较大的种群,其生态位宽度不一定大;③生态位重叠值大于0.3的有19对物种,占总物种数的12.42%,种群相互之间的生态位重叠程度不高,种群间利用性竞争不强,群落处于演替状态.生态位宽度较大的物种与其他种群间的生态位重叠的机会较大,反之亦小.生态位重叠值为0的物种对较多,说明物种适应生境的方式完全不同. We analyzed the niche characteristics of plant populations on natural restoration area in dry-hot valley of Jinshajiang River via field survey,the results demonstrate that: ① the important values of 18 species in 12 resource positions vary from 75.00% to 195.83%,among which the mean important value of Heteropogon contortus is 62.79%,mean important values of Dodonaea viscose,Fimbristylis ovata,Tragus berteronianus,and other 13 species are below 4.0%,Heteropogon contortus is the dominate species in this area;② Heteropogon contortus owns the most niche breadth（0.924）,Phyllanthus urinaria,Arundinella setosa,and Bothriochloa pertusa occupies the corresponding niche breadth of 17.82%,7.67%,and 7.40%,niche breadths of other species vary between 0.04 and 0.29,important value does not reflect niche breadths absolutely;③ Niche overlapping values of 19 pairs of species are over 0.3,comprised 12.42% of total species numbers,niche overplaying and competition among populations are not significant,and the communities are on succession courses.Species with significant niche breadths show greater chances of niche overlapping,and vice versa.Most of surveyed species show a zero niche overlapping,implying that the adapting mechanisms among species are different.Utilization of human disturbance on corresponding communities in dry-hot valley area of Jinshajiang River can accelerate the succession process, and reduce the restoration course. 干热河谷 植物种群 生态位特征 dry-hot valley plant populations niche characteristics Q948 “十一五”国家科技支撑计划项目（2006BAC01A11）;云南省自然科学基金（2006D0092M,2007C235M）资助项目 2008-02-01 2021-04-01 2