Results 31 to 40 of about 8,189 (162)
New Phytologist, Volume 247, Issue 6, Page 2616-2629, September 2025.Summary Seagrasses are important contributors to environmental nutrient cycling in marine ecosystems and can improve water quality by absorbing excess nitrogen (N). However, these ecosystems are vulnerable to human‐mediated pressures, including marine heatwaves (MHWs), particularly those of longer duration. We performed an experiment simulating a 30‐d,
Alissa V. Bass +5 more
wiley +1 more source
Shuitu Baochi Xuebao, 2005 通过对排污口附近及对照点的潮滩沉积物中重金属Zn ,Cu ,Cr和Pb的含量分析发现:各采样点沉积物中的重金属含量均高于环境背景值,平均含量约为环境背景值的2～3倍,排污口附近潮滩沉积物中重金属的含量明显高于对照点潮滩沉积物中的含量;各采样点的柱状沉积物中重金属的含量随深度的变化呈现出一定的变化规律;在垃圾填埋场附近高中低潮滩由于距离排污口的远近不同,表层沉积物中重金属的含量依次降低;对各采样点沉积物中重金属含量的相关性分析发现各点沉积物中累积的重金属的来源有所不同 ...
邓焕广 陈振楼 张菊 许世远 姚春霞
doaj
Spatial-temporal Distribution and Ecological Risk Assessment of Quaternary Ammonium Compounds in Urban Estuarine Sediments [PDF]
, 2016 四季铵盐化合物（QACs）是一类主要的阳离子表面活性剂，广泛使用于衣物柔顺剂、消毒剂、个人护理品等产品中。QACs易吸附于沉积物上且不易降解，欧美国家于上世纪八十年代已经禁止部分难降解QACs的使用，而亚洲国家仍在大量使用QACs作为商业产品的主要有效成分。在城市化河口环境中关于QACs的分布特征和环境行为的研究还很少。本研究进一步优化了QACs在沉积物的痕量分析方法，选取珠江口这一典型城市化河口区域，研究其表层沉积物中QACs的分布特征和环境行为，并对比分析珠江口沉积物中其他污染物（207种 ...
王翠翠
core
Joint Extraction Method for Spatial Relations in Chinese Geological Texts
Earth and Space Science, Volume 12, Issue 8, August 2025.Abstract Extracting spatial relations of geological entities is an important prerequisite for achieving natural language processing tasks such as geological knowledge question answering and semantic search, and is an important means to achieve structural reconstruction of unstructured geological data.
Chuan Chen +9 more
wiley +1 more source
Shuitu Baochi Xuebao, 2017 应用SMT连续提取法对连环湖敖包泡北部（AB1）和南部（AB2）柱状沉积岩芯中磷形态的含量和垂向分布特征进行对比分析，结合沉积岩芯年代测定，探讨了该湖区沉积物中磷的演化特征与人为污染历史以及内源磷的释放风险。结果表明，AB1、AB2沉积物中磷形态的含量和垂向变化不同，AB1沉积物中各形态磷含量均高于AB2，且随深度变化波动较大。20世纪40年代中期至1981年，AB1沉积物各形态磷和OM含量波动较大；AB2沉积物中Ca-P、IP、TP含量呈先增加后减少之势，Fe/Al-P、OP、OM含量变化较稳定 ...
曹微微, 肖海丰, 臧淑英
doaj
, 2007 采用多种测试方法分析了长江主要支流和干流的悬浮物和细粒河漫滩沉积物的Sr-Nd 同位素组成, 进而讨论其对河流沉积物物源的示踪意义. 悬浮物从上游到下游「Epsilon」Nd(0)逐渐减小, 上游平均为−10.8, 中下游为−12.3; 87Sr/86Sr 逐渐增大, 上游和中下游分别为0.721899 和0.725826. 这一变化规律反映了长江水系不同流域的源岩类型、化学组成特征和风化作用强弱等多因素的制 约.
Jiang, S +5 more
core
Conservation Biology, Volume 39, Issue 4, August 2025.Abstract Marine protected and conserved areas (MPCAs) are promoted as an ecosystem‐based adaptation (EbA) approach to increase community and ecosystem resilience to climate change. However, traditional approaches to MPCA design typically do not consider climate risk or habitat condition under a climate threat.
Alyssa L. Giffin +6 more
wiley +1 more source
Comparasion study on the effects of mangrove wetland sediments on the sequestration of typical sulfonamides from the estuarine water [PDF]
, 2015 作为陆地污染物进入海洋的屏障，红树林已然成为众多典型污染物汇聚的场所之一。近年来，海产养殖业的大肆兴起更是加重了抗生素在红树林区的直接污染。锁定态是控制土壤抗生素归宿的主要因素，具有环境存在时间长，危害大等特点，可通过再释放重回到环境中，对环境造成长期危害。对典型磺胺类在红树林群落沉积物中锁定能力的研究对于探索抗生素在红树林区的环境行为和红树林湿地抗生素污染控制及修复功能评估具有现实意义。本文选取了12种水产、禽畜及人用较为频繁的典型磺胺类药物，分别为磺胺甲噻二唑(sulfamethizole,SMT)、
张宇
core
Claw growth rates in a subset of adult, indoor, domestic cats (Felis catus)
Veterinary Dermatology, Volume 36, Issue 3, Page 362-367, June 2025.Background – Keratinised tissues, such as nails and claws, accumulate hormones over time; the claws' hormone concentrations are being explored as potential biomarkers. Timelines for hormone deposition can be established if claw growth rates are known. Hormone concentration within cat claws has been recently evaluated, yet the growth rates of cat claws ...
Elena T. Contreras +3 more
wiley +1 more source
Shuitu Baochi Xuebao, 2004 土壤侵蚀沉积是地球物质循环的重要环节，但人为因素使之加剧并引起许多生态环境问题。以四川紫色丘陵区小流域为例，根据地形部位及土壤性状划分出侵蚀沉积纵横断面，分析其侵蚀沉积特征，并采集土壤样品研究其颗粒组成和分形维数特征。结果表明：侵蚀沉积纵横断面不同地形部位侵蚀沉积特征明显不同，可分冲刷剥蚀、搬运扩散和沉积掩埋3种类型并连为侵蚀沉积链；侵蚀沉积纵横断面的划分对土壤侵蚀与沉积的认识更全面，整体性更强。研究区颗粒组成特别是粘粒含量明显地体现出侵蚀沉积的差异，分形维数综合体现出明显地随高度降低粗粒物质减少 ...
张保华 何毓蓉 徐佩 廖超林 朱波
doaj +2 more sources