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湖北蕲春九棵松野生蕲艾群落基本结构 被引量:4
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作者 董元火 廖新安 +4 位作者 夏恒建 彭仕梅 付李明 袁梦琪 廖廓 《江汉大学学报(自然科学版)》 2018年第1期58-61,共4页
通过α-多样性指数研究了蕲春九棵松野生蕲艾的群落基本结构。结果表明:该蕲艾居群面积约为15~20 m^2,植株数约25株左右,盖度仅为3%,为小居群。主要有10科13属13种植物与蕲艾相伴生。蕲春九棵松野生蕲艾群落的群丛名为刺槐+尖头青竹+野... 通过α-多样性指数研究了蕲春九棵松野生蕲艾的群落基本结构。结果表明:该蕲艾居群面积约为15~20 m^2,植株数约25株左右,盖度仅为3%,为小居群。主要有10科13属13种植物与蕲艾相伴生。蕲春九棵松野生蕲艾群落的群丛名为刺槐+尖头青竹+野菊花。α-多样性指数分析表明蕲艾群落辛普森指数(D)、香农威纳指数(H′)和Pielou均匀度指数(J)分别为0.867、2.180和0.850。人为干扰和过度采集是影响该野生蕲艾居群恢复更新的重要原因。 展开更多
关键词 蕲艾 小居群 种质资源 群落结构 蕲春
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Consensus of Flocks under M-Nearest-Neighbor Rules 被引量:1
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作者 CHEN Chen CHEN Ge GUO Lei 《Journal of Systems Science & Complexity》 SCIE EI CSCD 2015年第1期1-15,共15页
This paper investigates a class of flocks with an M-nearest-neighbor rule,where each agent's neighbors are determined according to M nearest agents with M being a given integer,rather than all the agents within a ... This paper investigates a class of flocks with an M-nearest-neighbor rule,where each agent's neighbors are determined according to M nearest agents with M being a given integer,rather than all the agents within a fixed metric distance as in the well-known Vicsek's model.Such a neighbor rule has been validated by biologists through experiments and the authors will prove that,similar to the Vicsek's model,such a new neighbor rule can also achieve consensus under some conditions imposed only on the system's speed and the number M,n,without resorting to any priori connectivity assumptions on the trajectory of the system.In particular,the authors will prove that if the number M is proportional to the population size n,then for any speed v,the system will achieve consensus with large probability if the population size is large enough. 展开更多
关键词 CONSENSUS multi-agent systems M-nearest neighbor random geometric graph topological distance.
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