Results 41 to 50 of about 5,755 (166)
武夷山自然保护区郁闭稳定甜槠林与人为干扰甜槠林物种多样性比较 [PDF]
, 2000 研究了武夷山自然保护区郁闭稳定甜槠林与人为干扰甜槠林的物种多样性 ,分别利用物种丰富度指数、Shannon- Wiener指数、Pielou均匀度和 Simpson指数作了比较。结果表明郁闭稳定甜槠林的物种丰富度为 11.370 4,Shannon- Wiener指数为 3.940 4,均匀度为 6 3.0 5 % ,Simpson指数为 6 .3740 ;人为干扰后的甜槠林的各项物种多样性指数值远比郁闭林高 ,分别为 2 0 .0 479、5 .5 431、78.44 %、2 1.716 3 ...
何建源 +4 more
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Ecological Solutions and Evidence, Volume 6, Issue 3, July–September 2025.Over the past three decades, a large number of natural wild soybean populations have been declining inexplicably or even have disappeared and their distribution area has significantly decreased in China, and population losses continue unabated. Therefore, this study investigated 20 herbaceous communities of wild soybeans in various habitats in ...
Ke‐Jing Wang, Xiang‐Hua Li
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New Phytologist, Volume 247, Issue 2, Page 504-517, July 2025.Summary Repetitive DNA is a feature of all organisms, ranging from archaea and plants to humans. DNA repeats can be seen both in coding and in noncoding regions of the genome. Due to the recurring nature of the sequences, simple DNA repeats tend to be more prone to errors during replication and repair, resulting in variability in their unit length ...
Sridevi Sureshkumar +3 more
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干扰素治疗后病毒性肝炎病人#br# 干扰素中和抗体的检测及意义
Zhongshan Daxue xuebao. Yixue kexue ban, 1997 摘 要 使用4 种α-干扰素的98 例病毒性肝炎病人, 在治疗前、治疗期间及治疗后定期检测抗干扰素中和抗 体, 结果发现阳性率为34.7%, 该抗体的产生与病人的性别、年龄、治疗前ALT 水平、肝炎病毒感染类型、以及肝炎的 临床类型均无显著相关;低剂量干扰素较易产生中和抗体;使用不同干扰素制剂产生中和抗体存在差异, 其中以 rIFN-α2a 最高, IFN-αN1 最低;但中和抗体的出现对干扰素的抗病毒疗效影响不大, 由于病例数较少,干扰素治疗期间 ...
徐启桓 彭文伟 陆玮伦
doaj
Ellobiid molluscs of Chinese mangrove habitats [PDF]
, 2011 耳螺是一类特殊的原始有肺类软体动物,主要分布于热带、亚热带海陆交汇区的高潮带和潮上带。耳螺在红树林区广泛分布,且资源非常丰富,全世界已知的约240种耳螺中,至少有一半以上的种类在红树林区被记录。本文总结了耳螺与红树林的关系以及中国嗜盐耳螺的种类,综述了红树林区耳螺的种类组成、分布、生态功能、行为等的研究进展,报道了中国大陆红树林耳螺种类组成和分布特点,中国共有嗜盐耳螺11属59种(附录I),其中9属42种分布于红树林区,包括21个新记录种。提出了耳螺对环境变迁和人为干扰十分敏感 ...
刘毅, 卢昌义, 王文卿, 王瑁
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Wildlife Letters, Volume 3, Issue 2, Page 73-83, June 2025.Blue sheep in Dhorpatan Hunting Reserve prefer alpine grasslands at 3800–4200 m on south‐facing slopes near water resources, favoring areas with low tree cover and dense ground cover, particularly rhododendrons, junipers, and Cyperaceae grasses. Their habitat significantly overlaps with livestock.
Amit Adhikari +4 more
wiley +1 more source
Dianci bileiqi, 1982 一、绪言根据IEC有关文件,我所安装了一套用于测试高压绝缘子无线电干扰水平的装置。为什么对高压绝缘子要进行这项试验呢?因为高压绝缘子若在正常运行电压下发生局部放电,就形成一种干扰源。这种干扰源会影响无线电设备的正常运行,从而引起了国内外人们的普遍注意 ...
乔振西
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野生动物学报, 2020 麋鹿属于国家Ⅰ级保护动物，对麋鹿种群在枯水期江滩湿地的生境选择特征进行调查分析，可为麋鹿种群的保护与管理提供科学依据。2017年秋季至2019年春季，运用种群生态学、行为生态学等研究方法，调查并比较了48个利用样方与41个对照样方，分析了石首麋鹿在长江枯水期的生境选择。研究表明，对长江枯水期麋鹿生境选择起到重要作用的关键因子分别为扰动因子、水源因子和隐蔽因子。长江枯水期麋鹿生境选择资源函数为：z=-0.518+1.672×人为干扰距离-0.186×水源距离-2.463×道路距离+0.224×隐蔽度-0 ...
张怀胜 1 +4 more
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Response of Avicennia marina rhizosphere to arsenic stress and arsenic accumulation and distribution in plants [PDF]
, 2016 红树林是生长在热带、亚热带河口海湾地区的木本植物群落，具有极高的生态价值和经济价值，但红树林湿地由于其独特的生境特征及强烈的人为干扰，面临着日益严重的重金属污染问题。其中，砷（As）由于具有强烈的致癌作用且影响植物正常新陈代谢，成为近几年红树林污染生态学研究的重要内容。目前，红树林As污染的研究主要集中于As在红树林湿地系统中的空间分布、生态风险评估以及As在沉积物中的赋存状态三个方面，有关As胁迫下红树植物的响应机制及红树植物生长对沉积环境中As迁移转化的影响鲜有报道 ...
范缙
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Journal of Animal Ecology, Volume 94, Issue 4, Page 745-759, April 2025.Our study reveals how top predators influence mammalian interaction networks by increasing complexity and redistributing interactions through indirect effects. These findings imply the important role of top predators in structuring communities, offering novel insights into the conservation and management of mammal communities in northeastern China ...
Wen She +5 more
wiley +1 more source