4 research outputs found

    云南元阳哈尼梯田鸟类群落组成及季节动态分析

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    为了解哈尼梯田鸟类群落结构及多样性构成,探讨不同农田类型和不同季节中鸟类群落变化特征。2019年7月—2020年4月,采用样线法对哈尼梯田4个季节分别进行鸟类专项调查。结果显示:共记录到鸟类86种,隶属10目37科,其中包括国家二级重点保护野生动物4种,分别是褐翅鸦鹃(Centropus sinensis)、小鸦鹃(C.bengalensis)、普通鵟(Buteo japonicus)和红隼(Falco tinnunculus);中国脊椎动物红色名录近危(NT)物种1种,即银耳相思鸟(Leiothrix argentauris);数据缺乏(DD)1种,为蓝喉拟啄木鸟(Psilopogon asiatica)。雀形目(Passeriformes)鸟类最多,共计27科69种。繁殖鸟类共74种,占鸟种数的86%,东洋种43种,占繁殖鸟类的58%,其余是广布种。居留类型以留鸟为主,64种,占74%,夏候鸟和冬候鸟各记录到10种。不同农田微生境类型下,旱田的丰富度、Shannon-Wiener多样性指数、Pielou均匀度指数和G-F指数均高于水田,但Shannon-Wiener指数(F=0.206,p>0.05)和Pielou均匀度指数(F=0.211,p>0.05)差异不显著。不同季节Shannon-Wiener指数(F=1.515,p>0.05)和Pielou均匀度指数(F=0.805,p>0.05)差异也不显著,优势度春季和冬季较高,夏季和秋季较低,相似性指数夏季和冬季最高,春季和秋季较低。从鸟类优势种来看,以人类伴生鸟类和适应人为干扰活动的鸟类为主要优势种。研究结果既掌握了哈尼梯田鸟类资源现状,还为开展农业生态系统的生物多样性服务功能提供基础数据

    Measurement of integrated luminosity of data collected at 3.773 GeV by BESIII from 2021 to 2024*

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    Amplitude analysis of the decays D0π+ππ+πD^0\rightarrow\pi^+\pi^-\pi^+\pi^- and D0π+ππ0π0D^0\rightarrow\pi^+\pi^-\pi^0\pi0

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    Determination of the number of ψ(3686) events taken at BESIII

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    The number of ψ(3686) events collected by the BESIII detector during the 2021 run period is determined to be (2259.3±11.1)×106 by counting inclusive ψ(3686) hadronic events. The uncertainty is systematic and the statistical uncertainty is negligible. Meanwhile, the numbers of ψ(3686) events collected during the 2009 and 2012 run periods are updated to be (107.7±0.6)×106 and (345.4±2.6)×106, respectively. Both numbers are consistent with the previous measurements within one standard deviation. The total number of ψ(3686) events in the three data samples is (2712.4±14.3)×10^
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