检索结果-南通市图书馆

Evidence of temperature-controlled dissolved inorganic nitrogen distribution in a shallow lake

Journal of Environmental Sciences 2022年第12期34卷 105-114页

作者： Yan Wen Wenqiang Zhang Baoqing Shan Jie Qu Research Center for Eco-Environmental Sciences Chinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China

dissolved inorganic nitrogen(DIN) plays an important role in aquatic ecosystems as an available source of nitrogen(N). Despite recent advances in our understanding of the effects of climate change on DIN in coastal waters, shallow high-latitude lakes exposed to large seasonal temperature differences have received limited research attention. Therefore,in the present study, Baiyangdian Lake(BYDL) was selected as the study area, as a typical high latitude shallow lake in North China. Based on water and sediment samples collected in spring, summer and winter seasons, DIN accumulation in sedimentary pore water and DIN diffusion fluxes at the sediment-water interface were quantified under different temperature conditions. Correlation analysis was used to establish the effects of temperature on DIN concentration and diffusion in different media. Results show that the diffusion of DIN at the lake sediment-water interface exhibited a strongly positive relationship with temperature, suggesting that high temperature conditions lead to greater DIN release from sediments. Cold temperatures cause DIN accumulation in sedimentary pore water, providing sufficient substrate for N-related bacteria in the sediment under cold temperature conditions. Temperature controls the vertical distribution of DIN by affecting its migratory diffusion and transformation at the sediment-water interface. These findings are valuable for understanding the impact of climate change on the distribution of N in inland shallow lakes,especially in high latitude shallow lakes subjected to large seasonal temperature differences throughout the year.

关键词： Shallow lake Temperature dissolved inorganic nitrogen Vertical distribution Diffusion flux

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Tracing the sources of nutrients through the Tsushima/Korea Strait

引用

Acta Oceanologica Sinica 2024年第6期43卷 142-152页

作者： Jing Zhang Xinyu Guo Lei Zhu Jianlong Feng Liang Zhao Key Laboratory of Marine Resource Chemistry and Food Technology Ministry of EducationTianjin 300457China College of Marine and Environmental Science Tianjin University of Science and TechnologyTianjin 300457China Center for Marine Environmental Studies Ehime UniversityMatsuyama 790-8577Japan

The nutrients from the East China Sea(ECS) through the Tsushima/Korea Strait(TS) strongly impact the eco system of the Japan Sea(JS).The complex origins of the Tsushima Warm Current and the various nutrient sources in the ECS result in complex spatial-temporal variations in nutrients in the *** a physical-biological model with a tracking technique,we studied the effects of nutrient sources from the ECS on the *** all the nutrient sources,the Kuroshio has the highest nutrient concentrations in the *** maximum concentration occurs at the bottom,while those of rivers and atmospheric depo sition occur at the surface,and that of the Taiwan Strait occurs in the middle *** nutrient transport through the TS exhibits similar seasonal variations,as does the volume *** transport of nutrients from the Kuroshio accounts for more than 85% of the *** transport of nutrients from the Taiwan Strait is greater during autumn and *** transport of dissolved inorganic nitrogen(DIN) from both rivers and atmospheric deposition through the TS peak in *** transport cannot be equated with volume *** DIN in the less saline zone originates not only from rivers but also from atmospheric deposition and the *** transport of nutrients from the Taiwan Strait is not as significant as its volume transport in the TS.

关键词： dissolved inorganic nitrogen dissolved inorganic phosphate East China Sea Japan Sea nutrient transport

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

dissolved Organic nitrogen in Mediterranean Ecosystems

引用

Pedosphere 2011年第3期21卷 309-318页

作者： M.DELGADO-BAQUERIZO F.COVELO A.GALLARDO Department of Physical Chemical and Natural Systems University Pablo de Olavide Ctra. de Utrera km.1Seville 41013 (Spain)

dissolved organic nitrogen （DON） in soils has recently gained increasing interest because it may be both a direct N source for plants and the dominant available N form in nutrient-poor soils, however, its prevalence in Mediterranean ecosystems remains unclear. The aims of this study were to i） estimate soil DON in a wide set of Mediterranean ecosystems and compare this levels with those for other ecosystems; ii） describe temporal changes in DON and dissolved inorganic nitrogen （DIN） forms （NH＋ and NO3）, and characterize spatial heterogeneity within plant communities; and iii） study the relative proportion of soil DON and DIN forms as a test of Schimel and Bennett＇s hypothesis that the prevalence of different N forms follows a gradient of nutrient availability. The study was carried out in eleven plant communities chosen to represent a wide spectrum of Mediterranean vegetation types, ranging from early to late successional status. DON concentrations in the studied Mediterranean plant communities （0-18.2 mg N kg-1） were consistently lower than those found in the literature for other ecosystems. We found high temporal and spatial variability in soil DON for all plant communities. As predicted by the Schimel and Bennett model for nutrient-poor ecosystems, DON dominance over ammonium and nitrate was observed for most plant communities in winter and spring soil samples. However, mineral-N dominated over DON in summer and autumn. Thus, soil water content may have an important effect on DON versus mineral N dominance in Mediterranean ecosystems

关键词： dissolved inorganic nitrogen nitrogen cycle soil ammonium soil N availability soil nitrate

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Environmental control of mesozooplankton community structure in the Hangzhou Bay, China

引用

Acta Oceanologica Sinica 2016年第10期35卷 96-106页

作者： SUN Dong LIU Zhensheng ZHANG Jing WANG Chunsheng SHAO Qianwen Laboratory of Marine Ecosystem and Biogeochemistry Second Institute of OceanographyState Oceanic Administration State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of OceanographyState Oceanic Administration

A quarterly study of mesozooplankton community structure and environmental variables in the Hangzhou Bay was conducted to examine the response of mesozooplankton community to the variation of water mass and environmental condition. The southeast coast of China is a typical region under the intensive influence of Asia monsoon and freshwater discharge from rivers. The water mass and environmental condition of the Hangzhou Bay, which were influenced by the interaction of currents, freshwater discharge of the Qiantang River and Changjiang River Plume, showed significant seasonal variation. Our results showed that both biomass and abundance were significantly higher in summer（（247.7±148.8） mg/m^3 and（350.9±215.6） ind./m^3, respectively）than those in other seasons. Four eco-geographical regions were divided based on the cluster analysis of zooplankton community of the Hangzhou Bay throughout the year, except for winter. Monsoon and the dissolved inorganic nitrogen（DIN） input from freshwater discharge of the Qiantang River and Changjiang River resulted in temporal and spatial variations of environmental gradient in the Hangzhou Bay, which significantly influenced the structure of mesozooplankton community. Redundancy analysis（RDA） indicated that the mesozooplankton community structure was strictly correlated with the DIN gradient, while salinity gradient showed a weak influence in the Hangzhou Bay.

关键词： zooplankton monsoons dissolved inorganic nitrogen Changjiang River Plume community composition East China Sea

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

The Characteristics of Nutrients Removal and Inhibitory Effect of Ulva clathrata on Vibrio anguillarum 65

The Characteristics of Nutrients Removal and Inhibitory Effe...

引用

中国海洋湖沼学会藻类学分会第七届会员大会暨第十四次学术讨论会

作者： Keguo LU~(a,b) Wei Lin~a Jianguo Liu~(a,*) a Indtitute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,P.R.China b Graduate University of Chinese Academy of Sciences,Beijing 100039,P.R.China

To investigate the ecological effect of macroalgae on de-eutrophication and deputation of mariculture seawater,the variation of dissolved inorganic nitrogen(DIN)and phosphate(DIP),the amount of Vibrio anguillarum and total heterotrophic bacteria in Ulva clathrata culture as well as on the algal surface were investigated by artificially adding nutrients and *** strain 65 from February to April in 2006. The results indicated that *** not only had a strong DIN and DIP removal capacities,but also showed a significant inhibitory effect on *** although without reducing the total heterotrophic bacteria.V. anguillarum 65 dropped from 5～8×10 cfu/ml to 10 cfu/ml in 10 g/L of fresh *** culture within 2 days *** all of the vibrios were efficiently eradicated from the algal culture *** results also showed that the inhibitory effect of *** on *** strain 65 was both DIN-and DIP-dependent *** of DIN and DIP could enhance the algal repressive effects on the *** did not reduce the total heterotrophic bacteria which kept at their high constant level in the culture *** studies showed that the culture suspension,in which *** was pre-cultured for 24 hours,also had inhibitory effect on *** strain 65,suggesting some unknown chemical substances which were either released from *** or produced by algal concomitant microorganisms might inhibit the proliferation of *** 65.

关键词： Ulva clathrata Inhibitory effect dissolved inorganic nitrogen Vibrio anguillarum 65

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：