【目的】研究神农架地区次生林主要原生树种与引进树种树干附生地衣多样性的差异,为该地区的地衣多样性保护和次生林管理提供理论支持。【方法】采用样线法调查神农架地区次生林7个原生树种和3个引进树种的树干附生地衣,运用Estimate S ...【目的】研究神农架地区次生林主要原生树种与引进树种树干附生地衣多样性的差异,为该地区的地衣多样性保护和次生林管理提供理论支持。【方法】采用样线法调查神农架地区次生林7个原生树种和3个引进树种的树干附生地衣,运用Estimate S 9.1.0软件包计算各树种预期地衣丰富度,统计各树种地衣群落的物种组成和生长型组成,计算Shannon-Wiener指数(H)、Simpson指数(D)和均匀度指数(E)并评估单株、树种和种组水平的群落多样性特征,最后采用系统聚类法对10个树种的地衣群落进行聚类。【结果】10个树种树干地衣预期丰富度存在较大差异,且引进树种的预期地衣丰富度均值高于原生树种;10个树种的树种内地衣丰富度和树种间地衣丰富度变异均较大,但原生树种组和引进树种组间无差异;引进树种和原生树种树干地衣的优势种类存在明显差异,表现为小刺褐松萝、大哑铃孢、流苏茶渍和日本珊瑚枝4种地衣在原生树种上成为优势种,橄榄斑叶梅和裂树花则只在引进树种上成为优势种,引进树种中新出现了美国树花、裂树花和侯氏树花等地衣;不同生长型地衣在树种间的分布也存在一定差异;原生树种地衣群落的多样性指数具有锐齿槲栎最低而川鄂柳最高的特点,而引进树种组具有华山松>马尾松>日本落叶松树的趋势;原生树种地衣群落的多样性指数略高于引进树种组;10个树种的地衣群落可以聚成与优势地衣组成相关的3类,而3个引进树种分属其中一类。【结论】神农架地区次生林拥有较高的地衣丰富度;10个树种的树干附生地衣群落在物种丰富度、多样性、优势种组成、部分地衣的宿主偏好方面存在差异,说明该地区森林生态系统的树种多样性对于地衣多样性维持具有重要意义;华山松等用材树种的引进及其种群动态对该地区地衣多样性的潜在影响值得关注。展开更多
[Objective] This study aimed to investigate the characteristics of Pb and Cd uptake and accumulation in Osmanthus fragrans（Thunb.） Lour.under single and combined stress of Pb and Cd.[Method] Pot experiment was adopt...[Objective] This study aimed to investigate the characteristics of Pb and Cd uptake and accumulation in Osmanthus fragrans（Thunb.） Lour.under single and combined stress of Pb and Cd.[Method] Pot experiment was adopted with O.fragrans seedlings as experimental materials to investigate the effect of single and combined stresses of Pb and Cd on the growth of O.fragrans seedlings under 0,50,100,500,1 000 and 2 000 mg/kg of Pb and 0,1,10,50,100 and 200 mg/kg of Cd.[Result] Under the experimental conditions,the growth of O.fragrans seedlings was significantly inhibited under moderate Pb stress（500 mg/kg） and high Cd stress（100 mg/kg）;the decreasing order of Pb uptake rate of different O.fragrans tissues was root stem leaf;the decreasing order of Cd content of different O.fragrans tissues was root stem leaf,while the decreasing order of Cd uptake rate of different O.fragrans tissues was stem root leaf.[Conclusion] Under combined stress,low concentrations of Pb and Cd can mutually promote the uptake and accumulation,while high concentrations of Pb and Cd can mutually inhibit the uptake and accumulation.展开更多
文摘【目的】研究神农架地区次生林主要原生树种与引进树种树干附生地衣多样性的差异,为该地区的地衣多样性保护和次生林管理提供理论支持。【方法】采用样线法调查神农架地区次生林7个原生树种和3个引进树种的树干附生地衣,运用Estimate S 9.1.0软件包计算各树种预期地衣丰富度,统计各树种地衣群落的物种组成和生长型组成,计算Shannon-Wiener指数(H)、Simpson指数(D)和均匀度指数(E)并评估单株、树种和种组水平的群落多样性特征,最后采用系统聚类法对10个树种的地衣群落进行聚类。【结果】10个树种树干地衣预期丰富度存在较大差异,且引进树种的预期地衣丰富度均值高于原生树种;10个树种的树种内地衣丰富度和树种间地衣丰富度变异均较大,但原生树种组和引进树种组间无差异;引进树种和原生树种树干地衣的优势种类存在明显差异,表现为小刺褐松萝、大哑铃孢、流苏茶渍和日本珊瑚枝4种地衣在原生树种上成为优势种,橄榄斑叶梅和裂树花则只在引进树种上成为优势种,引进树种中新出现了美国树花、裂树花和侯氏树花等地衣;不同生长型地衣在树种间的分布也存在一定差异;原生树种地衣群落的多样性指数具有锐齿槲栎最低而川鄂柳最高的特点,而引进树种组具有华山松>马尾松>日本落叶松树的趋势;原生树种地衣群落的多样性指数略高于引进树种组;10个树种的地衣群落可以聚成与优势地衣组成相关的3类,而3个引进树种分属其中一类。【结论】神农架地区次生林拥有较高的地衣丰富度;10个树种的树干附生地衣群落在物种丰富度、多样性、优势种组成、部分地衣的宿主偏好方面存在差异,说明该地区森林生态系统的树种多样性对于地衣多样性维持具有重要意义;华山松等用材树种的引进及其种群动态对该地区地衣多样性的潜在影响值得关注。
基金Supported by Major Science and Technology Program for Water Pollution Control and Treatment in the National Eleventh Five-Year Plan(2009ZX07104-003)Major Science and Technology Program for Water Pollution Control and Treatment in the National Twelfth Five-Year Plan(2012ZX07104-002-04)the Outstanding Youth Innovative Team Plan Project of Hubei Province(No:T200703)~~
文摘[Objective] This study aimed to investigate the characteristics of Pb and Cd uptake and accumulation in Osmanthus fragrans（Thunb.） Lour.under single and combined stress of Pb and Cd.[Method] Pot experiment was adopted with O.fragrans seedlings as experimental materials to investigate the effect of single and combined stresses of Pb and Cd on the growth of O.fragrans seedlings under 0,50,100,500,1 000 and 2 000 mg/kg of Pb and 0,1,10,50,100 and 200 mg/kg of Cd.[Result] Under the experimental conditions,the growth of O.fragrans seedlings was significantly inhibited under moderate Pb stress（500 mg/kg） and high Cd stress（100 mg/kg）;the decreasing order of Pb uptake rate of different O.fragrans tissues was root stem leaf;the decreasing order of Cd content of different O.fragrans tissues was root stem leaf,while the decreasing order of Cd uptake rate of different O.fragrans tissues was stem root leaf.[Conclusion] Under combined stress,low concentrations of Pb and Cd can mutually promote the uptake and accumulation,while high concentrations of Pb and Cd can mutually inhibit the uptake and accumulation.
