中文版 | English

在结果中检索

YIC-IR

浏览/检索结果: 共5条，第1-5条 帮助

限定条件                        
已选(0)清除 条数/页：   排序方式：
江苏近岸辐射沙洲潮滩变化遥感监测研究 学位论文
, 北京: 中国科学院大学, 2019
作者:  张媛媛
Adobe PDF(5947Kb)  |  收藏  |  浏览/下载：410/1  |  提交时间：2019/06/28
潮滩  面向对象  水边线  动态变化  T_tide  Tidal Flat  T_tide  Object-based  Waterline  Dynamic Change  
我国典型潮间带沉积物中持久性毒害物的污染特征、风险评价和源汇分析 学位论文
工学硕士, 中国科学院烟台海岸带研究所: 中国科学院烟台海岸带研究所, 2019
作者:  栾晓琳
Adobe PDF(4834Kb)  |  收藏  |  浏览/下载：564/3  |  提交时间：2019/06/28
潮间带沉积物  持久性毒害物  分布特征  风险评价  源汇  
苏北浅滩海藻养殖区精细化遥感与筏架回收动态监测 学位论文
工程硕士, 北京: 中国科学院大学, 2019
作者:  魏振宁
Adobe PDF(5561Kb)  |  收藏  |  浏览/下载：619/2  |  提交时间：2019/07/01
苏北浅滩海藻养殖区，精细化提取，养殖活动特征，黄海绿潮，遥感  
滨海湿地灌丛化机制及其生态效应研究进展 期刊论文
海岸科学, 2019, 卷号: 6, 期号: 1, 页码: 58-64
作者:  毕晓丽
Adobe PDF(394Kb)  |  收藏  |  浏览/下载：290/46  |  提交时间：2021/11/11
湿地灌丛化  海岸带  盐沼湿地  生态效应  蓝碳  
食用蔬菜能吸收和积累微塑料 期刊论文
科学通报, 2019, 卷号: 64, 期号: 9, 页码: 928-934
作者:  李连祯;  周倩;  尹娜;  涂晨;  骆永明
收藏  |  浏览/下载：536/0  |  提交时间：2020/06/17
微塑料  生菜  聚苯乙烯微球  吸收  积累  健康风险  microplastics  lettuce  polystyrene microbeads  uptake  accumulation  human health risk  Microplastic (MP, 100 nm-5 mm) may present an attributable risk to ecosystem and human health, and its pollution has become a global environmental concern. Despite a wealth of information on the accumulation of MPs in aquatic species, there is no information on the uptake and accumulation of MPs by higher plants. Terrestrial edible plants are directly exposed to MPs when agricultural soil was applied with organic manure, sewage sludge as fertilizer or plastic mulching. In this paper, the uptake of two sizes of polystyrene (PS) microbeads (0.2 and 1.0 mum) and then their distribution and migration in an edible plant lettuce were firstly investigated based on laboratory experiments. We used fluorescent markers to track PS microbeads in plant tissues and found fluorescence to be a sensitive and reliable detection method. Sections from untreated control lettuce showed no autofluorescence. When roots were treated with fluorescently labeled PS microbeads, the microbeads could be identified by its fluorescence. Our main study investigated the uptake of 0.2 mum beads, as few luminescence signals were observed in lettuce roots for 1.0 mum beads in our experiment. We observed that 0.2 mum fluorescent microbeads were extracellularly trapped in the root cap mucilage (which is a highly hydrated polysaccharide) and a dark green tip (which was typical of lettuce roots exposed to label PS beads) was usually visible to the naked eye. Confocal images revealed that the PS luminescence signals were mainly located in the vascular system and on the cell walls of the cortex tissue of the roots, indicated that the beads passed through the intercellular space via the apoplastic transport system. Once inside the central cylinder, the 0.2 mum PS beads were transferred from the roots to the stems and leaves via the vascular system following the transpiration stream. We also observed that the PS beads adhered to one another and self-assembled systematically into grape-like and (chain) string-like clusters in the intercellular space of the root and stem vascular tissue of lettuce plant. In contrast to the root and stem, PS beads were dispersed in the leaf tissue. Here, for the first time we provide evidence of the adherence, uptake, accumulation, and translocation of submicrometer MPs within an edible plant. Our findings highlight the previously underappreciated human exposure pathway to MPs through the consumption of contaminated crops and emphasize the need for new management strategies to control the release of MPs waste products into the terrestrial environment. Ultimately, the potential impacts of low range sized MPs on food safety of crop plants and human health need to be urgently considered.