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Participatory Land Rehabilitation Strategies in Angacha District, Kembata Zone, Central Ethiopia Region

Journal of Geoscience and Environment Protection 2024年第2期12卷 71-94页

作者： Endale Weldeamanuel shuiping cheng UNEP-TONGJ Institute of Environment for Sustainable Development (IESD) College of Environmental Science and Engineering Tongji University Shanghai China

Community participation has become widely incorporated into policies of many soil and water conservation organizations. The purpose of this study was to assess the community participation in the rehabilitation of degraded land. In order to achieve the objective of the study, both primary and secondary data were generated by employing qualitative and quantitative data. Purposive sampling was employed to select three study kebeles (the smallest administrative structure of the country) from 16 rural kebeles in Angecha District. Simple random sampling technique was used to select 183 household heads from the lists of farmers in the selected kebeles for detailed household survey. In addition to household survey, field observation and key informant interview were also conducted to collect the necessary data. The data were presented using descriptive statistic such as percentage, frequency, tables and figure. The data collected through the use of household survey questionnaires were analyzed using logit regression while data collected through field observation and key informant interview were analyzed and interpreted using qualitative description. The findings of the present study revealed that population pressure, soil erosion, deforestation, overgrazing, and over cultivation were the major causes for land degradation. Moreover, the results of this study indicated that the main causes of the low productivity of farmland were farmers’ involvement in off-farm activities, increase in size of human population, lack of full cooperation of family members to involve in land rehabilitation practices. Households participated in rehabilitation practices at different levels, with 43.7% respondents showing intermediate participation. However, 22.4% of the farm households clarified that there is low experience sharing and motivation to participate in the process of implementation of rehabilitation programs. It is recommended that, continuous training and experience sharing program, im

关键词： Community Participation Rehabilitation and Degradation

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Microbial community variation in phytoremediation of triazophos by Canna indica Linn. in a hydroponic system

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Journal of Environmental Sciences 2010年第8期22卷 1225-1231页

作者： Huiping Xiao shuiping cheng Zhenbin Wu State Key Laboratory of Freshwater Ecology and Biotechnology Institute of Hydrobiology the Chinese Academy of Sciences Wuhan 430072 China Graduate University of Chinese Academy of Sciences Beijing 100039 China

Phytoremediation of triazophos （O,O-diethyl-O-（1-phenyl-1,2,4-triazole-3-base） sulfur phosphate, TAP） pollution by Canna indica Linn. in a hydroponic system has been well studied, whereas the microbial mechanism on TAP degradation is still unknown. The variation in microbial community compositions was investigated by analyzing phospholipid fatty acids （PLFAs） profiles in microbes under TAP exposure. The TAP exposure resulted in an increase in proportions of fatty acid 16：0 and decrease in fatty acid 18：2ω9,12c, indicating that TAP may stimulate the reproduction of microorganisms and inhibit the growth of fungi to some degree. Significant correlation was found between the ratio of fungi to bacteria and TAP removal （r 2 = 0.840, p 0.01）. In addition, the microbial community in the phytoremediation system with C. indica was dominated by Gram negative bacteria, which possibly contributed to the degradation of TAP. These results indicated that TAP might induce the colonization of bacteria in the hydroponic system planted with C. indica, and lead to a discrimination of microbial community, which might be one of the mechanisms on TAP dissipation in phytoremediation system.

关键词： microbial community phospholipid fatty acids triazophos phytoremediation Canna indica Linn.

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Effects of Cd^(2+) and Pb^(2+) on the substrate biofilms in the integrated vertical-flow constructed wetland

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Journal of Environmental Sciences 2008年第8期20卷 900-906页

作者： Zhang Jinlian cheng shuiping He Feng Liang Wei Wu Zhenbin Chinese Acad Sci Inst Hydrobiol State Key Lab Freshwater Ecol & Biotechnol Wuhan 430072 Peoples R China Chinese Acad Sci Grad Univ Beijing 100049 Peoples R China

The effects of single Cd^(2+)and Pb^(2+),and combined Cd^(2+)and Pb^(2+)on dehydrogenase activity and polysaccharide content of the substrate biofilms in the integrated vertical-flow constructed wetland(IVCW)were *** activities decreased linearly with the increasing concentrations of Cd^(2+)and Pb^(2+)at different times(6,24,72,and 120 h).The activities at both 6 and 24 h were significantly higher than that at 72 and 120 h in the case of single and combined *** single Cd^(2+)and...

关键词： Cd^(2+) pb^(2+) biofilms dehydrogenase activity polysaccharide content integrated vertical-flow constructed wetland(IVCW)

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Bacterial diversity in activated sludge from a consecutively aerated submerged membrane bioreactor treating domestic wastewater

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Journal of Environmental Sciences 2008年第10期20卷 1210-1217页

作者： DU, cheng WU, Zhenbin XIAO, Enrong ZHOU, Qiaohong cheng, shuiping LIANG, Wei HE, Feng State Key Laboratory of Freshwater Ecology and Biotechnology Institute of Hydrobiology Chinese Academy of Sciences Wuhan 430072 China Graduate University Chinese Academy of Sciences Beijing 100039 China

The bacterial diversity of activated sludge from submerged membrane bioreactor (SMBR) was investigated. A 16S rDNA clone library was generated, and 150 clones were screened using restriction fragment length polymorphism (RFLP). Of the screened clones, almost full-length 16S rDNA sequences of 64 clones were sequenced. Phylogenetic tree was constructed with a database containing clone sequences from this study and bacterial rDNA sequences from NCBI for identification purposes. The 90.6% of the clones were a?l...

关键词： bacterial diversity restriction fragment length polymorphism (RFLP) submerged membrane bioreactor (SMBR) 16S rDNA clone library

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Short-term effects of drawing water for connectivity of rivers and lakes on zooplankton community structure

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Journal of Environmental Sciences 2008年第4期20卷 419-423页

作者： WU Zhenbin LIU Aifen ZHANG Shiyang cheng shuiping WU Xiaohui State Key Laboratory of Freshwater Ecology and Biotechnology Institute of Hydrobiology Chinese Academy of Sciences Wuhan 430072 China Graduate School of the Chinese Academy of Sciences Beijing 100039 China

During 28-29, September 2005, water was drawn from Hanjiang River and Houguan Lake to the Yangzi River via Sanjiao Lake and Nantaizi Lake in Wuhan in order to provide favorable conditions for ecosystem restoration. To evaluate the feasibility and validity of drawing water as a means of ecosystem restoration, zooplankton populations were studied 3 times （before, immediately after finishing and a month after drawing water） at seven locations from 27 Sept. 2005 to 2 Nov. 2005. Water quality in the lakes was mostly improved and zooplankton species richness decreased as soon as drawing water had finished but increased a month after drawing water. Zooplankton density and biomass was reduced in the lakes by drawing water but was increased at the entrance to Sanjiao Lake because of landform geometry change. Before drawing water, most species in Sanjiao Lake e.g., Brachionus sp. and Keratella sp. were tolerant of contamination. After drawing water oligotrophic-prone species such as Lecane ludwigii and Gastropus stylifer emerged. We conclude that drawing water could be important for improving water quality and favour ecosystem restoration. Dilution of nutrient concentrations may be an important role in the effect.

关键词： drawing water connectivity zooplankton species richness

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A comparison on the phytoremediation ability of triazophos by different macrophytes

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Journal of Environmental Sciences 2014年第2期26卷 315-322页

作者： Zhu Li Huiping Xiao shuiping cheng Liping Zhang Xiaolong Xie Zhenbin Wu State Key Laboratory of Freshwater Ecology and Biotechnology Institute of Hydrobiology Chinese Academy of Sciences University of the Chinese Academy of Sciences Wuhan Yangtze Business University Key Laboratory of Yangtze River Water Environment Ministry of Education Tongji University

The strategy of choosing suitable plants should receive great performance in phytoremediation of surface water polluted by triazophos （O,O-diethyl-O-（1-phenyl- 1,2,4-triazol-3-base） sulfur phosphate, TAP）, which is an organophosphorus pesticide widespread applied for agriculture in China and moderately toxic to higher animal and fish. The tolerance, uptake, transformation and removal of TAP by twelve species of macrophytes were examined in a hydroponic system and a comprehensive score （CS） of five parameters （relative growth rate （RGR）, biomass, root/shoot ratio, removal capacity （RC）, and bio-concentration factor （BCF）） by factor analysis was employed to screen the potential macrophyte species for TAP phytoremediation. The results showed that Thalia dealbata, Cyperus alternifolius, Canna indica and Acorus calamus had higher RGR values, indicating these four species having stronger growth capacity under TAP stress. The higher RC loading in Iris pseudacorus and Cyperus rotundus were 42.11 and 24.63μg/（g ***）, respectively. The highest values of BCF occurred in A. calamus （1.17）, and TF occurred in Eichhornia crassipes （2.14）. Biomass and root/shoot ratio of plant showed significant positive correlation with first-order kinetic constant of TAP removal in the hydroponic system, indicating that plant biomass and root system play important roles in remediation of TAP. Five plant species including C. alternifolius, A. calamus, T. dealbata, C. indica and Typha orientalis, which owned higher CS, would be potential species for TAP phytoremediation of contaminated water bodies.

关键词： pesticide removal capacity relative growth rate bio-concentration factor transfer factor root/shoot ratio factor analysis

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Effects of sediment dredging on water quality and zooplankton community structure in a shallow of eutrophic lake

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Journal of Environmental Sciences 2010年第2期22卷 218-224页

作者： Shiyang Zhang Qiaohong Zhou Dong Xu Jidong Lin shuiping cheng Zhenbin Wu State Key Laboratory of Freshwater Ecology and Biotechnology Institute of Hydrobiology Chinese Academy of Sciences Wuhan 430072 China Graduate School of Chinese Academy of Sciences Beijing 100049 China Wuhan Water Authority Wuhan 430014 China

Effects of suction dredging on water quality and zooplankton community structure in a shallow of eutrophic lake, were evaluated. The results showed that a decreasing trend for levels of phosphorus, organic matter, total suspended solids, Chlorophyll a and Secchi transparency in the water column was found, while levels of water depth, electrical conductivity, total dissolved solids and NO3^--N concentration increased markedly post-dredging. The effects of dredging on dissolved oxygen, pH value and temperature were almost negligible. The zooplankton community structure responded rapidly to the environmental changes caused mainly by dredging. As a result, the abundance of rotifers decreased, while the density of zooplanktonic crustaceans increased markedly. The representative taxa were Brachionus angularis, B. budapestinensis, B. diversicornis, Synchaeta spp. and Neodiaptomus schmackeri. A distinct relationship between zooplankton taxa composition and their environment, unraveled by a redundancy analysis, indicating that the measured environment contributed to the variations in the zooplankton community structure to some extent. The first four synthetic environmental variables explained 51.7% of the taxonomic structure. Therefore, with the reduction of internal nutrient load and a shift in dominance by less eutrophic species, it inferred that dredging might be one of effective measures for environmental improvements of such lakes.

关键词： zooplankton community structure redundancy analysis internal nutrient load

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南宁市南湖水质改善与水生态修复策略研究

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园林 2024年第6期41卷 33-40页

作者：尚文成水平叶烽夏博宇同济大学建筑设计研究院(集团)有限公司上海200092 同济大学环境科学与工程学院上海200092 南京中科水治理股份有限公司南京516001

城市湖泊是生态系统的重要组成部分,由于受人类活动干扰及外源、内源污染物输入等影响,其水生态系统退化,水环境质量恶化。通过对典型城市湖泊——南宁市南湖进行溢流口强化处理与生态净化、污水口设施改造、补水口水质优化、底泥清淤... 详细信息

城市湖泊是生态系统的重要组成部分,由于受人类活动干扰及外源、内源污染物输入等影响,其水生态系统退化,水环境质量恶化。通过对典型城市湖泊——南宁市南湖进行溢流口强化处理与生态净化、污水口设施改造、补水口水质优化、底泥清淤疏浚及水生态系统构建等,使湖区水质提升至地表水Ⅳ类标准,水体透明度提高到1.80m以上。水生态系统构建是南湖水质改善与水生态修复的核心,通过湖底生境营造,沉水植物群落构建,浮游动物、底栖动物及鱼类投放等,使“藻型”浑水态湖泊生态系统转变为以沉水植物为主的“草型”清水态湖泊生态系统,恢复了水生态系统完整性,水体营养状态由中度富营养转变为中营养,这对国内其他城市湖泊水质改善与水生态修复具有重要借鉴意义。

关键词：城市湖泊水质改善水生态修复生境营造生物操纵工程实践

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Freshwater algae chemotaxonomy by high-performance liquid chromatographic(HPLC)analysis

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Frontiers of Environmental Science & Engineering 2011年第1期5卷 84-91页

作者： Yansong HOU Wei LIANG Liping ZHANG shuiping cheng Feng HE Zhenbin WU State Key Laboratory of Freshwater Ecology and Biotechnology Institute of HydrobiologyChinese Academy of SciencesWuhan 430072China Graduate University of the Chinese Academy of Sciences Beijing 100049China

The study of community composition of algae is essential for understanding the structure and dynamics of the aquatic ecosystem and for evaluating the eutrophic level of the water body.A high-performance liquid chromatographic(HPLC)method based on a reversephase C_(18) nonpolar column was developed for the main algal taxa,which includes cyanophytes,bacillariophytes,euglenophytes,dinophytes,and *** on the elution order using HPLC,19 pigments were identified,and they were chlorophyllide a,19′-butanoyloxyfucoxanthin,chlorophyll c_(1)+c_(2),phephorbides a,peridinin,methyl-chlorophyllide a,fucoxanthin,neoxanthin,violaxanthin,myxoxanthophyll,diadinoxanthin,diatoxanthin,lutein,zeaxanthin,chlorophyll b allomer,chlorophyll b,chlorophyll a allomer,chlorophyll a,andβ,β-carotene.A comparison study of cell microscopic counts and accessory pigment analysis indicated that HPLC analysis could be a useful tool for monitoring phytoplankton communities and their abundance.

关键词： high-performance liquid chromatographic(HPLC) algae pigment chemotaxonomy

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基于RSEI与FAI模型的浙江千岛湖乡村岸水协同修复与生态功能区划研究

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园林 2024年第6期41卷 23-32页

作者：王敏王佳奇李俊尚文成水平同济大学建筑与城市规划学院上海200092 高密度人居环境生态与节能教育部重点实验室水绿生态智能分实验中心上海200092 上海城市困难立地绿化工程技术研究中心上海201499 杭州市生态环境局淳安分局杭州311717 同济大学建筑设计研究院(集团)有限公司上海200092 同济大学环境科学与工程学院上海200092

千岛湖是截蓄新安江水流而成的山地型人工湖泊,陆域水土流失与水域富营养化问题是导致库区整体生态环境质量下降的两大关键性因素。选取千岛湖人类活动最为频繁的40个河口村镇作为研究对象,聚焦98~118m高程的岸水交接地带,基于水陆耦合... 详细信息

千岛湖是截蓄新安江水流而成的山地型人工湖泊,陆域水土流失与水域富营养化问题是导致库区整体生态环境质量下降的两大关键性因素。选取千岛湖人类活动最为频繁的40个河口村镇作为研究对象,聚焦98~118m高程的岸水交接地带,基于水陆耦合协调的视角,探究该地带在生态过程中水土流失与水体富营养化问题的岸水协同生态修复治理方案,旨在解决“岸水空间生态功能区划如何兼顾应对陆域水土流失与水域富营养化两方面生态风险”的关键性水生态修复问题,建立水体治理的长效机制。根据千岛湖正常高水位,以108~118m高程为陆域范围,以98~108m高程为水域范围,基于研究区域的landsat8卫星遥感数据,运用RSEI模型评价陆域水土流失状况,运用FAI模型评价水域富营养化状况,二者耦合协调分析获得水陆生态环境质量的耦合协调发展水平,据此研判关键性水生态问题并分区提出岸水协同生态修复治理措施。结果表明,中度失调河口2个,轻度失调河口2个,濒临失调河口1个,勉强协调河口5个,初级协调河口10个,中级协调河口9个,良好协调河口11个;根据耦合协调发展水平将40个河口村镇划分为三级生态功能区,其中一级生态功能区重点强化治污措施、二级生态功能区重点提高生态韧性、三级生态功能区重点促进价值转换。

关键词：水生态修复消落带耦合协调生态功能区划千岛湖

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