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Search Results: 1 - 10 of 26721 matches for " JIN Xiangcan "
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Analysis of eutrophication state and trend for lakes in China
Journal of Limnology , 2003, DOI: 10.4081/jlimnol.2003.s1.60
Abstract: The article analyzes the present state and trend of eutrophication of lakes in China and concludes that lakes throughout the country are commonly undergoing the process of eutrophication: most of urban lakes are facing hypertrophication, many mediumsized lakes are of eutrophic state, some lakes even approaching to hypertrophic level. The five large freshwater lakes are in the condition of eutrophication, especially Lake Caohu and Lake Taihu are already in the state of eutrophication, water quality is deteriorating and ecosystem is destroyed. According to domestic and foreign experiences of the successful demonstrations in eutrophication and pollution treatment, this article puts forward the theory of combining source control with ecological restoration, which as the guidance for eutrophication control of lakes in China.
The key scientific problems in lake eutrophication studies

JIN Xiangcan,

环境科学学报 , 2008,
Abstract: Eutrophication is one of the most serious environmental problems in Chinese lakes. Studies on cycling disorder of nutrient elements in watershed, occurring of blue-green algal blooms and their harmful effects on lake environments, degeneration and ecological restoration mechanisms of aquatic ecology are the main bases for lake eutrophication management and control.
Seasonal changes of P adsorption/desorption characteristics at the water-sediment interface in Meiliang Bay,Taihu Lake,China

JIN Xiangcan,

环境科学学报 , 2008,
Abstract: Seasonal changes of phosphorus adsorption/desorption were investigated by collecting overlying water and seasonal sediment samples from Meiliang Bay,Taihu Lake,China.The data were analyzed to determine the function change of sediment as "Source" and "Sink" in the different seasons.At the same time,seasonal changes of TP and Pfractions' concentration at the beginning and the end of the adsorption experiment were also carried out to find the most active Pfraction in this process.The effects of temperature on the Ptranslocation process were also measured and are discussed.The following conclusions were obtained:The sequence of concentrations of TPand phosphorus fractions in the different seasons was CSpring< CSummer
Current status and future tendency of lake eutrophication in China
Xiangcan Jin,Qiujin Xu,Changzhu Huang
Science China Life Sciences , 2005, DOI: 10.1007/BF03187133
Abstract: Lake eutrophication has become a serious environmental problem in China. Based on the domestic and foreign experiences of the eutrophic control technologies, both nutrient pollution control and lake ecological restoration should be carried out and this may be the guidance for the eutrophic control of lakes in China.
Contaminant removal from low-concentration polluted river water by the bio-rack wetlands
Ji Wang,Lanying Zhang,Shaoyong Lu,Xiangcan Jin,Shu Gan,
Ji Wang
,Lanying Zhang,Shaoyong Lu,Xiangcan Jin,Shu Gan

环境科学学报(英文版) , 2012,
Abstract: The bio-rack is a new approach for treating low-concentration polluted river water in wetland systems. A comparative study of the efficiency of contaminant removal between four plant species in bio-rack wetlands and between a bio-rack system and control system was conducted on a small-scale (500 mm length × 400 mm width × 400 mm height) to evaluate the decontamination effects of four different wetland plants. There was generally a significant difference in the removal of total nitrogen (TN), ammonia nitrogen (NH3-N) and total phosphorus (TP), but no significant difference in the removal of permanganate index (CODMn) between the bio-rack wetland and control system. Bio-rack wetland planted with Thalia dealbata had higher nutrient removal rates than wetlands planted with other species. Plant fine-root (root diameter ≤ 3 mm) biomass rather than total plant biomass was related to nutrient removal efficiency. The study suggested that the nutrient removal rates are influenced by plant species, and high fine-root biomass is an important factor in selecting highly effective wetland plants for a bio-rack system. According to the mass balance, the TN and TP removal were in the range of 61.03--73.27 g/m2 and 4.14--5.20 g/m2 in four bio-rack wetlands during the whole operational period. The N and P removal by plant uptake constituted 34.9%--43.81% of the mass N removal and 62.05%--74.81% of the mass P removal. The study showed that the nitrification/denitrification process and plant uptake process are major removal pathways for TN, while plant uptake is an effective removal pathway for TP.
Ecological restoration and reconstruction of degraded lakeside zone ecosystem

YAN Changzhou~,JIN Xiangcan,ZHAO Jingzhu,YE Chun,WANG Zhongqiong,

应用生态学报 , 2005,
Abstract: As a kind of aquatic-terrestrial ecotone,lakeside zone plays an important role in the lake basin ecosystem,and has high ecological,social and economic values.Its functions include lake buffer,conservation of biological diversities and special habitats,dike protection from soil erosion,and economic and esthetics values.The main factors inducing lakeside zone degradation are the anthropogenic activities that caused the converse succession of communities and the decline of ecological function.The theoretical basis of ecological restoration and reconstruction of degraded lakeside zone is restoration ecology; while the technologies are of three types,i.e.,habitat restoration and reconstruction,species restoration and reconstruction,and structural and functional restoration.A three-year case study on the ecosystem restoration and reconstruction of degraded lakeside zone of Erhai Lake in Yunnan Province showed that the aquatic macrophytes were restored,purifying function was distinct,algae were restrained,and the component and individuals of zooplankton were changed.In a word,the biological diversity and stability in the degraded lakeside-zone ecosystem increased after the restoration and reconstruction.
Effects of illumination on overlying water quality and on phosphate adsorption by sediment

JIANG Xia,JIN Xiangcan,YAO Yang,LI Lihe,

应用生态学报 , 2005,
Abstract: By the method of laboratory simulation,this paper studied the effects of illumination on the quality of overlying water and on the phosphate adsorption by sediment in a clean lake region.The results showed that under anaerobic condition,illumination could increase the pH value and the dissolved oxygen(DO) concentration of overlying water,while under aerobic condition,the concentration of dissolved inorganic phosphate(DIP) in overlying water declined fast at the beginning of the experiment,which indicated that DIP concentration was controlled by the DO concentration at the water-sediment interface.With the time went on,the DIP concentration in overlying water was much lower in the light than in the dark,indicating that illumination was the dominant controlling factor to the DIP concentration in overlying water.Phosphate could be adsorbed by the sediment with continuously loading,and the adsorbed amount varied with different environmental conditions.The effect of illumination on the phosphate adsorption by sediment was limited by the environment whether being aerobic or anaerobic.
Algal control by ultrasonic radiation and its risks to the aquatic environment

CHU Zhaosheng,PANG Yan,ZHENG Shuofang,JIN Xiangcan,

环境科学学报 , 2008,
Abstract: 通过恒温培养实验(250L培养基)表征了低强度 (发射功率20W) 定向发射超声波对惠氏微囊藻、孟氏浮游蓝丝藻、四尾栅藻以及菱形藻的生长影响,并通过超声波对大草履虫、大型蚤、稀有鮈鲫以及蜈蚣草的作用研究了其对水生生态的安全性.结果表明,超声波对蓝藻惠氏微囊藻的生长有较好的抑制作用,6d后生物量仅为对照组的32%;超声波对蓝藻孟氏浮游蓝丝藻、绿藻四尾栅藻以及硅藻菱形藻的生长也有一定的抑制作用,超声波作用10~13 d后,藻细胞密度比对照组低30%~33%.结果还表明,该强度的超声波对浮游动物草履虫和大型蚤、鱼类稀有鮈鲫以及沉水植物蜈蚣草的生长没有受到明显的影响.研究结果说明,低强度定向超声波可以对藻类生长产生抑制作用,而对水体中浮游动物、鱼类以及沉水植物等其它主要水生生物不产生明显影响.
Regularity of nitrogen release under low oxygen conditions from various sediments in a river network

GUO Jianning,LU Shaoyong,JIN Xiangcan,ZHANG Lihong,SHENG Li,

环境科学学报 , 2010,
Abstract: Four sediment samples affected by different human activities were collected from the Wenzhou Wenruitanghe River network, Zhejiang Province. They represented upriver water, tannery drainage, construction waste and municipal drainage. The characteristics of release of various nitrogen (N) forms from the different sediments were investigated under low dissolved oxygen (DO) conditions. The transformation of N in the sediment-water system was significantly affected by the conditions of the overlying water. It was disadvantageous for N release if the overlying water was seriously contaminated, and it was advantageous for N release when the condition of the overlying water was improved. The N in the overlying water, highly contaminated in the Yutianhe River, could be transferred into the seriously polluted sediment by diffusion, leading to an increase of TN and nitrate nitrogen (NO-3-N) in the sediments. Input control of external N could decrease the potential load of contamination. Ammonia nitrogen (NH+4-N) was released into the overlying water from all kinds of sediments while NO-3-N was transferred into them. The quantities of NH+4-N released from sediments were higher than those of NO-3-N transferred into the sediments. The risk of NO-3-N release was lower than that of NH+4-N under low oxygen conditions.
Effects of temperature on growth, photosynthesis and buoyancy regulation of the cyanobacteria Microcystis flos-aquae and Planktothrix mougeotii

JIN Xiangcan,CHU Zhaosheng,YANG Bo,ZHENG Shuofang,PANG Yan,ZENG Qingru,

环境科学学报 , 2008,
Abstract: 通过批量培养实验,测定培养过程中藻的生物量、光合放氧速率及浮力等的变化,研究了2种典型水华蓝藻-水华微囊藻及孟氏浮游蓝丝藻在不同温度下的生长和光合作用特征及浮力调控的机制结果表明,水华微囊藻在温度低于13℃时几乎不能生长,高于16℃能缓慢生长,且随着温度升高,生长速率增大;孟氏浮游蓝丝藻在温度为10℃时就能缓慢生长,当温度高于16℃时即能够较好生长;2种藻的生长速率在10~28℃范围内都随温度升高而增大.2种蓝藻在10℃以上均能进行光合作用,且在实验温度范围内(10~28℃)随温度的升高而增强当温度从28℃转至13℃以下温度培养时,2种蓝藻的浮力下降明显,细胞内伪空胞、糖及蛋白质的变化表明,糖的积累使细胞密度增大是细胞浮力下降的主要原因;在72h之内,水华微囊藻和浮游蓝丝藻细胞内糖含量分别增加了2.2倍和2.5倍,这说明温度降低至13℃以下,水华微囊藻下沉趋于休眠,而孟氏游浮蓝丝藻则趋于底栖继续生长;温度升高至13℃以上,水华微囊藻趋于复苏和上浮,而孟氏浮游蓝丝藻趋于浮游.
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