检索结果-南通市图书馆

Journal of Environmental Sciences 2019年第5期31卷 239-247页

作者： Huai Li Zifang Chi baixing yan Key Laboratory of Wetland Ecology and Environment Northeast Institute of Geography and Agroecology Chinese Academy of Sciences Key Laboratory of Groundwater Resources and Environment Ministry of Education Jilin University

The increasing application of engineered nanoparticles(NPs) has posed an emerging challenge to constructed wetland wastewater treatment. The performance, microbial community and toxic mechanism of anammox-based unplanted subsurface-flow constructed wetlands(USFCWs) were investigated under the long-term exposure of different graphene oxides(GOs) and Ag NP concentrations. Results showed that the addition of GO could promote TN removal, manifesting as function anammox bacteria C. Anammoxoglobus having a relative high abundance, for GO did not cause significant damage to the cell integrity though there was an increase in ROS concentrations. TN removal would not be obviously affected under exposure of 1 mg/L Ag NPs, for the function gene related to cell biogenesis and repair was up-regulated; while the addition of 10 mg/L Ag NPs would have an inhibiting effect on TN removal in the USFCWs, for the disappearance of some species having anammox ability. Key enzymes of anammox process(NIR and HDH) decreased to some extent under GO and Ag NP exposure, and function gene of defense mechanisms had an increase trend in samples.

关键词： Anammox Ag NPs GO Microbial community Function gene Key enzymes

Effects of land use and changes in cover on the transformation and transportation of iron:A case study of the Sanjiang Plain,Northeast China

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2011年第5期54卷 686-693页

作者： PAN XiaoFeng yan baixing Yoh MUNEOKI Key Laboratory of Wetland Ecology and Environment Northeast Institute of Geography and Agroecology Chinese Academy of Sciences Changchun 130012 China Graduate University of Chinese Academy of Sciences Beijing 100049 China Tokyo University of Agriculture and Technology Tokyo 1838509 Japan

Wetland reclamation has been ongoing in the Sanjiang Plain since the mid-1950s,which has resulted in major changes in wetlands and the agriculture ecosystem in the region that have influenced the iron output to the Sea of Okhotsk and limited the primary productivity in the North Pacific *** study was conducted to investigate the chemical forms of iron in different aquatic environments(agricultural water including groundwater,paddy water,and canal water;wetland water including marsh water,marsh streams,and main streams) with the cross-flow filtration method to reveal the transportation and transformation characteristics of iron in response to major land use *** addition,the factors affecting iron behavior in different water bodies were *** marsh water and streams,the concentrations of dissolved iron were higher due to the high organic matter contents and marsh water becoming the main iron source for river *** conversion of dissolved iron into acid-labile iron occurred during the discharge of wetland water into marsh *** primarily existed in both the >0.7 and <0.01 μm size fractions,accounting for about 58.3% and 26.4% of the total dissolved iron,*** agricultural irrigation systems,ferrous ion entered the paddy fields from groundwater,and a fraction of this ferrous iron was subsequently converted into high molecular weight and medium molecular weight iron(colloid iron) in paddy and canal ***,the concentrations of total dissolved iron decreased by 62.5% from underground to the surface due to the formation of *** this,water discharge in agriculture is still an important iron source for rivers and has the potential to supplement iron due to its higher acid-labile iron *** use and cover change and agricultural irrigation increased the iron content of surface soil,but reduced the output of iron in water ***,the concentration of total dissolved iron in water systems has be

关键词： land use and cover change marsh water marsh river agricultural water iron species Sanjiang Plain

Assessment of Point and Nonpoint Sources Pollution in Songhua River Basin,Northeast China by Using Revised Water Quality Model

在线全文

学校读者我要写书评

暂无评论

Chinese Geographical Science 2010年第1期20卷 30-36页

作者： yanG Yuhong yan baixing SHEN Wanbin Key Laboratory of Wetland Ecology and Environment Northeast Institute of Geography and Agroecology Chinese Academy of Sciences Changchun 130012 China Graduate University of Chinese Academy of Sciences Beijing 100049 China College of Environment and Resources Jilin University Changchun 130012 China

Individual participation of pollutants in the pollution load should be estimated even if roughly for the appropriate environmental management of a river *** is difficult to identify the sources and to quantify the load, especially in modeling nonpoint *** this study a revised model was established by integrating point and nonpoint sources into one-dimensional Streeter-Phelps(S-P) model on the basis of real-time hydrologic data and surface water quality monitoring data in the Jilin Reach of the Songhua River *** oxygen demand(COD) and ammonia nitrogen(NH 3-N) loads were *** showed that COD loads of point source and nonpoint source were 134 958 t/yr and 86 209 t/yr, accounting for 61.02% and 38.98% of total loads, *** 3-N loads of point source and nonpoint source were 16 739 t/yr and 14 272 t/yr, accounting for 53.98% and 46.02%, *** source pollution was stronger than nonpoint source pollution in the study area at *** water quality of upstream was better than that of downstream of the rivers and *** is indispensable to treat industrial wastewater and municipal sewage out of point sources, to adopt the best management practices to control diffuse pollutants from agricultural land and urban surface runoff in improving water quality of the Songhua River *** revised S-P model can be successfully used to identify pollution source and quantify point source and nonpoint source loads by calibrating and validating.

关键词： ammonia nitrogen chemical oxygen demand nonpoint source pollution point source pollution revised water quality model Songhua River Basin

Variations of Dissolved Iron in the Amur River During an Extreme Flood Event in 2013

在线全文

学校读者我要写书评

暂无评论

Chinese Geographical Science 2016年第5期26卷 679-686页

作者： yan baixing GUAN Jiunian Vladimir SHESTERKIN ZHU Hui Key Laboratory of Wetland Ecology and Environment Northeast Institute of Geography and Agroecology Chinese Academy of Sciences School of Environment Northeast Normal University Institute of Water and Ecology Problems Far Eastern Branch Russian Academy of Sciences

As a key factor limiting primary productivity in marine ecosystem, dissolved iron(DFe) export from fluvial systems has increased recently. There is particular concern about discharges of DFe during extreme flooding, when they are thought to increase considerably. An extreme flood event that caused inundation of extensive areas of Far Eastern Russia and Northeastern China occurred in the basin of the Amur River during summer and autumn 2013. During this event, water samples were collected in the middle reaches of the Amur River and the lower reaches at Khabarovsk City and analyzed for DFe concentrations and other aquatic parameters. The results show that the average DFe concentrations in the middle reaches of the Amur River(right bank) and at Khabarovsk were 1.11 mg/L and 0.32 mg/L, respectively, during the extreme flood in 2013. The total discharge of DFe during the flood event was 6.25 × 104 t. The high discharge of DFe during the flood reflects the elevated discharge of the river, hydrologically connected riparian wetlands, vast quantities of terrestrial runoff, and flood discharges from the Zeya and Bureya reservoirs. These results show that long-term monitoring is needed to identify and assess the impacts of DFe transport on the downstream reaches, estuarine area, and coastal ecosystems of the Amur River.

关键词： dissolved iron dissolved organic matter extreme flooding event land use the Amur River wetland

Effect of Nitrogen and Phosphorus on Tissue Nutrition and Biomass of Freshwater Wetland Plant in Sanjiang Plain,Northeast China

在线全文

学校读者我要写书评

暂无评论

Chinese Geographical Science 2006年第3期16卷 270-275页

作者： XU Zhiguo yan baixing HE yan ZHAI Jinliang SONG Changchun Northeast Institute of Geography and Agroecology Chinese Academy of Sciences Changchun 130012 China Graduate University of Chinese Academy of Sciences Beijing 100049 China Chinese Academy of Sciences Beijing 100864 China

Nitrogen (4, 10, 20 and 40g/m2) and phosphorus (1.2, 4.8 and 9.6g/m2) were applied to tanks to evaluating the effects of N and P additions on plant tissue nutrition and the biomass of two freshwater wetland plants in the Sanjiang Plain of Northeast China, namely Carex lasiocarpa and Carex meyeriana. For C. lasiocarpa, the total N concentration (TN) of plant tissues under the treatment of 10g/m2 was lower compared with the other N treatments. Initially, C. lasiocarpa exhibited a significant increase of biomass as compared with the control value, reaching the maximum of 31.20±4.01g/tank under the treatment of 10g/m2, and then dropped to 18.02±1.53g/tank under the treatment of 40g/m2. For C. meyeriana, TN generally increased with increasing amount of N applied. High N applied produced more aboveground biomass than low N applied. C. meyeriana, as the accompanying species, can adapt itself to the wetland enriched by N, and it may replace C. lasiocarpa as the dominant species of wetland. The total P concentration (TP) in tissues of C. lasiocarpa increased with P addition. The aboveground biomass of C. lasiocarpa increased with P addition, and it changed from 18.77±3.29g/tank to 46.03±3.95g/tank. However, TP of tissue may accelerate the C. meyeriana development under the treatment of 1.2g/m2. P accumulation contributes to the dominance of C. lasiocarpa but limits the production of C. meyeriana, and the latter may disappear gradually from the wetland enriched by P. Increased input of N and P might have an influence on wetland plant community composition and structure, so the effects of nutrient inputs and accumulation should be considered to protect the freshwater wetland.

关键词： freshwater wetland nitrogen phosphorus Carex lasiocarpa Carex meyeriana Sanjiang Plain

Temporal variability of iron concentrations and fractions in wetland waters in Sanjiang Plain, Northeast China

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2010年第7期22卷 968-974页

作者： Xiaofeng Pan baixing yan Muneoki Yoh Lixia Wang Xiuqi Liu Key Laboratory of Wetland Ecology and Environment Northeast Institute of Geography and A groecology Chinese Academy of Sciences Changchun 130012 China Graduate University of Chinese Academy of Sciences Beijing 100049 China Tokyo University of Agriculture and Technology Tokyo 1838509 Japan

Chemical forms, reactivities and transformation of iron fractions in marshy waters were investigated with cross-flow filtration technique to study the iron environmental behavior. Iron fractions were divided into four parts： acid-labile iron （pre-acidification of unfiltered marshy water samples, 〉 0.7 μm）, high-molecular-weight iron （0.7-0.05 μm）, medium-molecular-weight iron （0.05-0.01 μm）, and low-molecular-weight iron （〈 0.01μm）. The cross-flow filtration suggested that iron primarily exist in both the 〉 0.7 μm and 〈 0.01 μm size fractions in marshy waters. Rainfall is the key for rain-fed wetland to determine fate of iron by changing the aquatic biochemical conditions. By monitoring the variation of iron concentrations and fractions over three years, it was found that dissolved iron and acid-labile iron concentrations exhibit a large variation extent under different annual rainfalls from 2006 to 2008. The seasonal variation for iron species proved that the surface temperature could control some conversion reactions of iron in marshy waters. Low- molecular-weight iron would convert to acid-labile iron gradually with temperature decreasing. The photochemical reactions of iron fractions, especially low-molecular-weight iron had occurred under solar irradiation. The relative proportion of low-molecular-weight in total dissolved iron ranging from 28.3% to 43.2% were found during the day time, which proved that the observed decreasing concentration of acid lability iron was caused by its degradation to low molecular weight iron.

关键词： iron species cross-flow filtration wetland waters photochemical behavior

An innovative wood-chip-framework substrate used as slow-release carbon source to treat high-strength nitrogen wastewater

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2017年第1期29卷 275-283页

作者： Huai Li Zifang Chi baixing yan Long Cheng Jianzheng Li Key Laboratory of Wetland Ecology and Environment Northeast Institute of Geography and AgroecologyChinese Academy of Sciences State Key Laboratory of Urban Water Resource and Environment Harbin Institute of Technology Key Lab of Groundwater Resources and Environment Ministry of EducationJilin University

Removal of nitrogen in wastewater before discharge into receiving water courses is an important consideration in treatment ***,nitrogen removal efficiency is usually limited due to the low carbon/nitrogen（C/N） ratio.A common solution is to add external carbon sources,but amount of liquid is difficult to ***,a combined wood-chip-framework substrate（with wood,slag and gravel） as a slow-release carbon source was constructed in baffled subsurface-flow constructed wetlands to overcome the *** show that the removal rate of ammonia nitrogen（NH_4~＋-N）,total nitrogen（TN） and chemical oxygen demand（COD） could reach 37.5%-85%,57.4%-86%,32.4%-78%,respectively,indicating the combined substrate could diffuse sufficient oxygen for the nitrification process（slag and gravel zone） and provide carbon source for denitrification process（wood-chip zone）.The nitrification and denitrification were determined according to the location of slag/gravel and wood-chip,*** removal was efficient at the steady phase before a shock loading using slag-wood-gravel combined substrate because of nitrification-denitrification process,while nitrogen removal was efficient under a shock loading with wood-slag-gravel combined substrate because of ANAMMOX *** study provides a new idea for wetland treatment of high-strength nitrogen wastewater.

关键词： Baffled constructed wetland Combined substrate Wood-chip Nitrogen Removal

Measurement and Analysis of Formation Conditions of Dew in Carex lasiocarpa Marsh

在线全文

学校读者我要写书评

暂无评论

湿地科学 2009年第2期7卷 155-161页

作者： XU Yingying yan baixing GUO Yuedong Key Laboratory of Wetland Ecology and Environment Science Northeast Institute of Geography and Agroecology Chinese Academy of Sciences Changchun 130012 Jilin P. R. China Graduate University of Chinese Academy of Sciences Beijing 100049 P. R. China

In order to investigate the dew amounts and analysis formation conditions of dew by examining the correlations between dew amounts and meteorological factors in Carex lasiocarpa marsh in the Sanjiang Plain,the dew amounts and several meteorological factors were monitored during the growing season from June to September in 2005 and 2008 at the Sanjiang Mire Wetland Experimental Station,Chinese Academy of *** was collected by woodstick made by poplar tree in Carex lasiocarpa marsh and the amounts were estimated by subtraction *** results indicated that average daily accumulated dew amounts reached the peak in *** highest dew amounts in Carex lasiocarpa marsh were 0.201 mm/d,and the most frequent dew volume ranged from 0.08 mm/d to 0.14 mm/*** amounts correlated positively with relative humidity,dew point temperature,and water vapor *** it correlated negatively with wind *** dew production in Carex lasiocarpa marsh more frequently occurred under the conditions of wind speed around 2.0 m/s,the water vapor pressure above 9 hPa;the relative humidity between 90% and 95% and dew point temperature above 6 ℃.

关键词：湿地水汽液体大气现象

Geochemical Characteristics of Heavy Metals in Riparian Sediment Pore Water of Songhua River, Northeast China

在线全文

学校读者我要写书评

暂无评论

Chinese Geographical Science 2011年第2期21卷 195-203页

作者： ZHU Hui yan baixing PAN Xiaofen yanG Yuhong WANG Lixia Key Laboratory of Wetland Ecology and Environment Northeast Institute of Geography and Agroecology Chinese Academy of Sciences Changchun 130012 China Graduate University of Chinese Academy of Sciences Beijing 100049 China

This study reports the geochemical characteristics of zinc (Zn), copper (Cu), lead (Pb), nickel (Ni), mercury (Hg), iron (Fe), and manganese (Mn) in the riparian sediment pore water of the Songhua River, Northeast China. In total, 36 pore water samples and 18 surface water samples from three typical sections were collected and analyzed in June 2009. Cluster analysis of heavy metals was performed to analyze the pollution sources of the metals. Results showed that Hg concentrations in the pore water were greater than those in the surface water, indicating a potential ability of Hg release from riparian sediment system to river water. However, concentrations of Fe and Mn in the surface water were greater than those in the pore water, demonstrating that the microenvironments of riparian and riverbed sediment systems were quite different. Variations of Zn, Cu, Pb and Ni between the surface and the pore water were different in each section. Most metals had similar horizontal and profile distribution characteristics in the three sections except for Zn and Ni. Hg, Fe and Mn concentrations in the pore water increased gradually with the increase in horizontal distance from water body, in contrast to this, Cu decreased, and Pb presented a fluctuating trend. With the increase in depth, Pb and Fe, Cu and Mn showed the same trends, and Hg showed a variable trend. The above distribution characteristics could mainly be attributed to the properties and the interactions of metals, pH and oxidation-reduction conditions, and the complex pollution sources and hydrologic regime in history. The probable sources of metals include the historical and ongoing discharge of industrial wastewater, mining activities, sewage irrigation for agricultural production, and atmospheric deposition from coal-fired plants.

关键词： heavy metal riparian sediment pore water water pollution Songhua River

Flux characteristics of total dissolved iron and its species during extreme rainfall event in the midstream of the Heilongjiang River

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2015年第4期27卷 74-80页

作者： Jiunian Guan baixing yan Hui Zhu Lixia Wang Duian Lu Long Cheng Key Laboratory of Wetland Ecology and Environment Northeast Institute of Geography and Agroecology Chinese Academy of Sciences University of Chinese Academy of Sciences

The occurrence of extreme rainfall events and associated flooding has been enhanced due to climate changes, and is thought to influence the flux of total dissolved iron（TDI） in rivers considerably. Since TDI is a controlling factor in primary productivity in marine ecosystems, alteration of riverine TDI input to the ocean may lead to climate change via its effect on biological productivity. During an extreme rainfall event that arose in northeastern China in 2013, water samples were collected in the midstream of the Heilongjiang River to analyze the concentration and species of TDI as well as other basic parameters. The speciation of TDI was surveyed by filtration and ultrafiltration *** with data monitored from 2007 to 2012, the concentration of TDI increased significantly during this event, with an average concentration of 1.11 mg/L, and the estimated TDI flux reached 1.2 × 10^5 tons, equaling the average annual TDI flux *** analysis revealed that low-molecular-weight complexed iron was the dominant species, and the impulse of TDI flux could probably be attributed to the hydrological connection to riparian wetlands and iron-rich terrestrial runoff. Moreover, dissolved organic matter played a key role in the flux, species and bioavailability of TDI. In addition,there is a possibility that the rising TDI flux could further influence the transport and cycling of nutrients and related ecological processes in the river, estuary coupled with the coastal ecosystems, which merits closer attention in the future.

关键词： Total dissolved iron Extreme rainfall event Midstream of the Heilongjiang River Flux