The sedimentary strata and deposition ages of the 'old red sand' distributed along the coasts of south Fujian and west Guangdong are determined by lithostratigraphy, magnetic stratigraphy and earth chemistry c...The sedimentary strata and deposition ages of the 'old red sand' distributed along the coasts of south Fujian and west Guangdong are determined by lithostratigraphy, magnetic stratigraphy and earth chemistry combined with TL, ESR and 14C-dating techniques. The research shows that the 'old red sand' was aeolian sediments deposited from 55 400 to 9 000 aBP, the last glacial period in the middle and later age of Late Pleistocene. Most of them deposited in two periods of 56-42 ka and 30-10 ka. The 'old red sand' deposited in the period of 30-10 ka, the later Wurm glacier substage (Q33), developed on the largest scale with the widest distribution.展开更多
在2011-2013年间对粤东地区进行了20余次野外大型海藻资源调查，采集了大量标本。利用形态特征，对部分标本进行了分类学研究。经鉴定，标本中包含江蓠属5个种及变种，即芋根江蓠Gracilaria blodgettii Harvey、异枝江蓠G. bailinae Cha...在2011-2013年间对粤东地区进行了20余次野外大型海藻资源调查，采集了大量标本。利用形态特征，对部分标本进行了分类学研究。经鉴定，标本中包含江蓠属5个种及变种，即芋根江蓠Gracilaria blodgettii Harvey、异枝江蓠G. bailinae Chang et Xia、细基江蓠G. tenuistipitata Chang et Xia、细基江蓠繁枝变种G. tenuistipitata var. liui Zhang et Xia、长喙江蓠G. longirostris Zhang et Wang。它们的主要鉴定特征分别为：芋根江蓠的分枝基部明显缢缩；异枝江蓠的藻体暗绿色，初级分枝围绕主轴互生、偏生或叉分；细基江蓠的藻体主轴基部纤细，分枝简单；细基江蓠繁枝变种的藻体纤细，分枝繁多；长喙江蓠的囊果具有明显的长喙状突起。其中，芋根江蓠和异枝江蓠在粤东地区属首次报道，文章对其进行了较详细的介绍。该研究结果丰富了粤东江蓠属的物种多样性，为粤东地区江蓠属物种资源的保护和利用提供了分类学依据。展开更多
文摘The sedimentary strata and deposition ages of the 'old red sand' distributed along the coasts of south Fujian and west Guangdong are determined by lithostratigraphy, magnetic stratigraphy and earth chemistry combined with TL, ESR and 14C-dating techniques. The research shows that the 'old red sand' was aeolian sediments deposited from 55 400 to 9 000 aBP, the last glacial period in the middle and later age of Late Pleistocene. Most of them deposited in two periods of 56-42 ka and 30-10 ka. The 'old red sand' deposited in the period of 30-10 ka, the later Wurm glacier substage (Q33), developed on the largest scale with the widest distribution.
文摘在2011-2013年间对粤东地区进行了20余次野外大型海藻资源调查，采集了大量标本。利用形态特征，对部分标本进行了分类学研究。经鉴定，标本中包含江蓠属5个种及变种，即芋根江蓠Gracilaria blodgettii Harvey、异枝江蓠G. bailinae Chang et Xia、细基江蓠G. tenuistipitata Chang et Xia、细基江蓠繁枝变种G. tenuistipitata var. liui Zhang et Xia、长喙江蓠G. longirostris Zhang et Wang。它们的主要鉴定特征分别为：芋根江蓠的分枝基部明显缢缩；异枝江蓠的藻体暗绿色，初级分枝围绕主轴互生、偏生或叉分；细基江蓠的藻体主轴基部纤细，分枝简单；细基江蓠繁枝变种的藻体纤细，分枝繁多；长喙江蓠的囊果具有明显的长喙状突起。其中，芋根江蓠和异枝江蓠在粤东地区属首次报道，文章对其进行了较详细的介绍。该研究结果丰富了粤东江蓠属的物种多样性，为粤东地区江蓠属物种资源的保护和利用提供了分类学依据。
