借助广义线性模型（generalized linear models，GLM），拟合了混沟森林植被乔、灌、草各层及群落总体的Shannon-Wiener指数与环境因子问的关系，并通过SФrenson指数研究了海拔梯度上相邻森林群落类型物种组成的相似性，结果显示：（1...借助广义线性模型（generalized linear models，GLM），拟合了混沟森林植被乔、灌、草各层及群落总体的Shannon-Wiener指数与环境因子问的关系，并通过SФrenson指数研究了海拔梯度上相邻森林群落类型物种组成的相似性，结果显示：（1）土壤pH值和海拔高度是对物种Shannon-Wiener指数影响最广泛的环境因子，湿度指数对混沟地区物种多样性影响不大。坡向对乔木层Shannon-Wiener指数的影响比较大，对灌木层和草本层a多样性无明显作用，在中等pH值和半阴／半阳坡乔木层Shannon-Wiener指数最小；灌木层Shannon—Wiener指数随海拔的升高呈下降趋势；草本层Shannon—Wiener指数没有表现出特定的变化规律；群落总体Shannon—Wiener指数主要受土壤pH值影响，随着pH值的增加呈上升趋势；（2）乔、灌、草各层以及群落总体的SФrenson指数在海拔梯度上的变化规律大致相同，都是在中等海拔处较低，低海拔和高海拔处各有一个峰值，海拔1000～1500m段可能是混沟主要植被类型的过渡带。展开更多
The species richness of herb layer was investigated among 43 plots of forest vegetation in the eastern Zhongtiao Mountain, in southern Shanxi Province, China. The forest vegetation was divided into two major vegetatio...The species richness of herb layer was investigated among 43 plots of forest vegetation in the eastern Zhongtiao Mountain, in southern Shanxi Province, China. The forest vegetation was divided into two major vegetation types such as the deciduous forest and the coniferous forest by the two-way indicator species analysis （TWINSPAN）. The species richness of herb layer was fitted in the topographic and soil feature factors, as well as the topographic relative moisture index （TRMI） by the generalized linear models （GLM）. The results showed that canopy cover and altitude were the most significant environmental factors. Soil pH value and soil nutrients index such as total N, organic matter content had no significant influence. The effect of environment factors on species richness of herb layer had significant difference in vegetation types. For the broad-leaved forest, litter depth and TRMI were the important environment factors. For the coniferous forest, soil clay content was another important environment factor. The range of environmental gradient such as altitude may contribute to the difference.展开更多
茎柔鱼是世界上重要的经济头足类,也是我国大陆鱿钓渔业最重要的捕捞对象之一。根据中国大陆鱿钓船2003-2004年、2006-2012年9年的渔业生产统计数据和卫星遥感获得的海洋环境数据,利用广义线性模型(generalized linear model,GLM)和广...茎柔鱼是世界上重要的经济头足类,也是我国大陆鱿钓渔业最重要的捕捞对象之一。根据中国大陆鱿钓船2003-2004年、2006-2012年9年的渔业生产统计数据和卫星遥感获得的海洋环境数据,利用广义线性模型(generalized linear model,GLM)和广义加性模型(generalized additive model,GAM)对秘鲁外海茎柔鱼的资源丰度进行CPUE标准化,分析秘鲁外海茎柔鱼资源丰度年际变化。经显著性检验,得到最终选择加入模型的自变量有年、月、纬度、经度、叶绿素浓度、年与经度交互项、年与纬度交互项、月与经度交互项、月与纬度交互项共9个自变量。GAM结果表明,模型自变量对因变量的决定系数高达42.3%。标准化后CPUE与名义CPUE变化趋势相同,年平均值略低于名义CPUE,2003-2012年秘鲁外海茎柔鱼资源丰度年间变化较大,资源丰度最高的年份为2004年,GLM标准化后的平均CPUE为7.94 t/d;资源丰度最低的年份为2007年,GLM标准化后的平均CPUE为3.28 t/d。展开更多
The generalized linear model （GLM） and generalized additive model （GAM） were applied to the standardization of catch per unit effort （CPUE） for Chilean jack mackerel from Chinese factory trawl fishing fleets in ...The generalized linear model （GLM） and generalized additive model （GAM） were applied to the standardization of catch per unit effort （CPUE） for Chilean jack mackerel from Chinese factory trawl fishing fleets in the Southeast Pacific Ocean from 2001 to 2010 by removing the operational, environmental, spatial and temporal impacts. A total of 9 factors were selected to build the GLM and GAM, i.e., Year, Month, Vessel, La Nifia and E1 Nifio events （ELE）, Latitude, Longitude, Sea surface temperature （SST）, SST anomaly （SSTA）, Nino3.4 index and an interaction term between Longitude and Latitude. The first 5 factors were significant components in the GLM, which in combination explained 27.34% of the total variance in nominal CPUE. In the stepwise GAM, all factors explained 30.78% of the total variance, with Month, Year and Vessel as the main factors influencing CPUE. The higher CPUE occurred during the period April to July at a SST range of 12-15℃ and a SSTA range of 0.2-1.0℃. The CPUE was significantly higher in normal years compared with that in La Nifia and E1 Nifio years. The abundance of Chilean jack mackerel declined during 2001 and 2010, with an increase in 2007. This work provided the relative abundance index of Chilean jack mackerel for stock as- sessment by standardizing catch and effort data of Chinese trawl fisheries and examined the influence of temporal, spatial, environ- mental and fisheries operational factors on Chilean jack mackerel CPUE.展开更多
【目的】分析185份陆地棉品种(系)的开花期株高(PH-ST_(1))和吐絮期株高(PH-ST_(2))关联度,发掘动态株高的优异等位变异,为进一步棉花高产分子辅助育种提供参考。【方法】利用185份陆地棉品种(系)的基因型,将137对简单重复序列(simple s...【目的】分析185份陆地棉品种(系)的开花期株高(PH-ST_(1))和吐絮期株高(PH-ST_(2))关联度,发掘动态株高的优异等位变异,为进一步棉花高产分子辅助育种提供参考。【方法】利用185份陆地棉品种(系)的基因型,将137对简单重复序列(simple sequence repeat,SSR)多态性引物开发出的355个多态性位点,并结合5个环境下两个时期的株高表型数据,采用一般线性模型(general linear model,GLM)和混合线性模型(mixed linear model,MLM)进行关联分析。【结果】使用GLM模型和MLM模型,分别检测到54、12个与PH-ST_(1)显著相关的位点和62、12个与PH-ST_(2)显著相关的位点;其中,31个位点在3个或3个以上的环境都与株高显著相关。【结论】挖掘了多个可重复检测到的与陆地棉株高相关联的分子标记位点。定位到与株高性状相关的位点有24个。展开更多
目的:系统评价肉芽肿性小叶性乳腺炎(GLM)的复发情况。方法:计算机检索中国知网(CNKI)、万方数据库(WanFang Database)、中国生物医学文献数据库(CBM)、维普数据库(VIP)、PubMed、Web of Science、EMbase,搜集有关GLM复发因素相关的研究...目的:系统评价肉芽肿性小叶性乳腺炎(GLM)的复发情况。方法:计算机检索中国知网(CNKI)、万方数据库(WanFang Database)、中国生物医学文献数据库(CBM)、维普数据库(VIP)、PubMed、Web of Science、EMbase,搜集有关GLM复发因素相关的研究,检索时限为建库至2023年5月16日。结果:最终纳入9篇文献,涉及1741例GLM病人。Meta分析结果显示:GLM复发率为16%[95%CI(12%,21%)],影响因素分析显示,棒状杆菌感染[OR=4.80,95%CI(1.76,13.09),P<0.01]、吸烟[OR=11.01,95%CI(1.14,106.78),P<0.05]等是GLM复发的独立危险因素。结论:现有证据表明,GLM复发率较高,且受棒状杆菌感染和吸烟等因素的影响,受纳入研究数量的限制,研究结果尚待更多高质量研究予以验证。展开更多
文摘借助广义线性模型（generalized linear models，GLM），拟合了混沟森林植被乔、灌、草各层及群落总体的Shannon-Wiener指数与环境因子问的关系，并通过SФrenson指数研究了海拔梯度上相邻森林群落类型物种组成的相似性，结果显示：（1）土壤pH值和海拔高度是对物种Shannon-Wiener指数影响最广泛的环境因子，湿度指数对混沟地区物种多样性影响不大。坡向对乔木层Shannon-Wiener指数的影响比较大，对灌木层和草本层a多样性无明显作用，在中等pH值和半阴／半阳坡乔木层Shannon-Wiener指数最小；灌木层Shannon—Wiener指数随海拔的升高呈下降趋势；草本层Shannon—Wiener指数没有表现出特定的变化规律；群落总体Shannon—Wiener指数主要受土壤pH值影响，随着pH值的增加呈上升趋势；（2）乔、灌、草各层以及群落总体的SФrenson指数在海拔梯度上的变化规律大致相同，都是在中等海拔处较低，低海拔和高海拔处各有一个峰值，海拔1000～1500m段可能是混沟主要植被类型的过渡带。
基金This study was supported by the National Natural Science Foundation of China （No. 40271047）.
文摘The species richness of herb layer was investigated among 43 plots of forest vegetation in the eastern Zhongtiao Mountain, in southern Shanxi Province, China. The forest vegetation was divided into two major vegetation types such as the deciduous forest and the coniferous forest by the two-way indicator species analysis （TWINSPAN）. The species richness of herb layer was fitted in the topographic and soil feature factors, as well as the topographic relative moisture index （TRMI） by the generalized linear models （GLM）. The results showed that canopy cover and altitude were the most significant environmental factors. Soil pH value and soil nutrients index such as total N, organic matter content had no significant influence. The effect of environment factors on species richness of herb layer had significant difference in vegetation types. For the broad-leaved forest, litter depth and TRMI were the important environment factors. For the coniferous forest, soil clay content was another important environment factor. The range of environmental gradient such as altitude may contribute to the difference.
基金co-funded by the National High Technology Research and Development program of China(No.2012AA092301)the Agriculture Science Technology Achievement Transformation Fund(No.2010C00001)the Project of Fishery Exploration in High Seas of the Ministry of Agriculture of China(2010–2011)
文摘The generalized linear model （GLM） and generalized additive model （GAM） were applied to the standardization of catch per unit effort （CPUE） for Chilean jack mackerel from Chinese factory trawl fishing fleets in the Southeast Pacific Ocean from 2001 to 2010 by removing the operational, environmental, spatial and temporal impacts. A total of 9 factors were selected to build the GLM and GAM, i.e., Year, Month, Vessel, La Nifia and E1 Nifio events （ELE）, Latitude, Longitude, Sea surface temperature （SST）, SST anomaly （SSTA）, Nino3.4 index and an interaction term between Longitude and Latitude. The first 5 factors were significant components in the GLM, which in combination explained 27.34% of the total variance in nominal CPUE. In the stepwise GAM, all factors explained 30.78% of the total variance, with Month, Year and Vessel as the main factors influencing CPUE. The higher CPUE occurred during the period April to July at a SST range of 12-15℃ and a SSTA range of 0.2-1.0℃. The CPUE was significantly higher in normal years compared with that in La Nifia and E1 Nifio years. The abundance of Chilean jack mackerel declined during 2001 and 2010, with an increase in 2007. This work provided the relative abundance index of Chilean jack mackerel for stock as- sessment by standardizing catch and effort data of Chinese trawl fisheries and examined the influence of temporal, spatial, environ- mental and fisheries operational factors on Chilean jack mackerel CPUE.
文摘【目的】分析185份陆地棉品种(系)的开花期株高(PH-ST_(1))和吐絮期株高(PH-ST_(2))关联度,发掘动态株高的优异等位变异,为进一步棉花高产分子辅助育种提供参考。【方法】利用185份陆地棉品种(系)的基因型,将137对简单重复序列(simple sequence repeat,SSR)多态性引物开发出的355个多态性位点,并结合5个环境下两个时期的株高表型数据,采用一般线性模型(general linear model,GLM)和混合线性模型(mixed linear model,MLM)进行关联分析。【结果】使用GLM模型和MLM模型,分别检测到54、12个与PH-ST_(1)显著相关的位点和62、12个与PH-ST_(2)显著相关的位点;其中,31个位点在3个或3个以上的环境都与株高显著相关。【结论】挖掘了多个可重复检测到的与陆地棉株高相关联的分子标记位点。定位到与株高性状相关的位点有24个。
文摘目的:系统评价肉芽肿性小叶性乳腺炎(GLM)的复发情况。方法:计算机检索中国知网(CNKI)、万方数据库(WanFang Database)、中国生物医学文献数据库(CBM)、维普数据库(VIP)、PubMed、Web of Science、EMbase,搜集有关GLM复发因素相关的研究,检索时限为建库至2023年5月16日。结果:最终纳入9篇文献,涉及1741例GLM病人。Meta分析结果显示:GLM复发率为16%[95%CI(12%,21%)],影响因素分析显示,棒状杆菌感染[OR=4.80,95%CI(1.76,13.09),P<0.01]、吸烟[OR=11.01,95%CI(1.14,106.78),P<0.05]等是GLM复发的独立危险因素。结论:现有证据表明,GLM复发率较高,且受棒状杆菌感染和吸烟等因素的影响,受纳入研究数量的限制,研究结果尚待更多高质量研究予以验证。
