中国科技核心期刊
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20 January 2020, Volume 10 Issue 1
 Wetland loss identification based on remote sensing technology and its application in Binhai New Area, Tianjin City LÜ Jinxia,JIANG Weiguo,WANG Wenjie,LI Zhuo,CHEN Zheng,CHEN Kun 2020, 10 (1):  1-8.  doi: 10.12153/j.issn.1674-991X.20190092 Abstract ( 10 )   HTML ( 4 )   PDF (31453KB) ( 2 )   The acceleration of the urbanization process and a series of unreasonable development and utilization of wetland resources have caused serious damage of the wetland, and the monitoring of the temporal and spatial changes of wetland resources plays important role in the regional development and sustainable development of wetland. Based on multi-period land use data and long-term sequence Landsat image data, the loss status of wetland types were analyzed by using Markov transfer matrix and GIS spatial analysis method. The trend analysis method was used to analyze the wetland vegetation, water body and soil moisture elements loss in long-term sequences and different stages. The remote sensing identification method of wetland loss was constructed, and the wetland loss patterns were summarized combined with wetland type and wetland element loss, with a case study in Tianjin Binhai New Area. The results showed that the damage of wetland types in Binhai New Area was mainly divided into three periods (1980s-2000, 2000-2009, 2009-2015). From 1980s to 2015, the wetland experienced the process from damage to recovery, and the wetland area increased by 41.40 km 2. Wetland elements showed a degradation trend from 1984 to 2015. The areas of significant degradation of NDVI, NDWI and SMMI were 364.66, 221.28 and 253.94 km 2, respectively. In three different periods, different dominant factors affected the damaged area of wetland. In Binhai New Area, the wetland loss was mainly caused by vegetation, water area and vegetation during the three periods.
 Methodology study on the wetland restorability evaluation and its application in Binhai New Area, Tianjin City LÜ Jinxia,WANG Wenjie,JIANG Weiguo,CHEN Zheng,LI Zhuo,DENG Yawen 2020, 10 (1):  9-16.  doi: 10.12153/j.issn.1674-991X.20190091 Abstract ( 8 )   HTML ( 8 )   PDF (11959KB) ( 3 )   The wetland recoverability assessment could obtain the difficulty of wetland restoration, and provide important theoretical support for the site selection and implementation of wetland restoration. Based on the wetland types and ecological element data, the assessment method for the recoverability of damaged wetland was constructed by using wetland element damaged area and wetland type loss area, which could evaluate the recoverability of damaged wetland quantitatively. Based on the topographical conditions, urbanization effects and ecological importance indicators in the region, and using the source-sink theory and the minimum cumulative resistance model, a method to evaluate the regional recoverability of wetland was constructed, which were used to quantitatively evaluate the wetland natural recoverability at the regional scale. The evaluation methods of wetland natural recoverability were proposed at damaged wetland and regional scale. Furthermore, a case study was conducted in Binhai New Area, Tianjin city. The results showed that: (1) In damaged wetland scale, the area of stable wet area in Binhai New Area was 640.30 km 2, the largest proportion of the recovery area, followed by the most difficult recovery area, with an area of 381.85 km 2, accounting for 22.15%. The most difficult recovery area and the more difficult recovery area were accounted for 42.36% of the entire recovery area. (2) In regional scale, under the medium and high safety level, the area of the relatively easy recovery area of Binhai New Area was1 695.65 km 2, accounting for 82.02%. The area of low recovery area were 67.55 km 2 and 129.05 km 2, accounting for 3.27% and 6.24%, respectively.
 Wetland degradation risk assessment method and its application: a case study of Tianjin City LI Zhuo,JIANG Weiguo,WANG Wenjie,LÜ Jinxia,CHEN Zheng 2020, 10 (1):  17-24.  doi: 10.12153/j.issn.1674-991X.20190100 Abstract ( 6 )   HTML ( 6 )   PDF (21985KB) ( 1 )   Due to the acceleration of the climate change and human activities, the wetlands, which are important ecosystem on the earth, are continuously appropriated, damaged and even disappearing. It is thus very urgent and necessary to establish a reliable evaluation model for the wetlands degradation. Based on the theory of regional ecological risks, a multi-index evaluation system including 22 indexes was established from the two aspects of stress degree and degradation degree, and the risks of wetland degradation in Tianjin from 1990 to 2015 was assessed. The results showed that the risk of wetland degradation in Tianjin City showed a trend of decreasing first and then increasing due to the fluctuation change of stress degree and the increase of degradation degree of the wetland itself. The value of degradation risk in 2015 increased by 10.08% compared to 1990. And the risk value of the areas with originally low risk of wetland degradation presented a phenomenon of rapid increase of risk. Therefore, it is urgent to formulate more strict policies and build up a better management system to strengthen the protection and restoration of wetlands in Tianjin City.
 Spatial optimization and configuration scheme of wetland park based on landscape ecology: a case study of Liuli River Wetland Park in Beijing LI Binglun,WANG Wenjie,HU Yuanman,LIU Miao,BU Rencang,SHI Sixue,XIONG Zaiping 2020, 10 (1):  25-31.  doi: 10.12153/j.issn.1674-991X.20190122 Abstract ( 6 )   HTML ( 4 )   PDF (16682KB) ( 2 )   Whether urban wetland park can play its ecological function mainly depends on its spatial distribution pattern. According to the optimization concept of pattern-process-function integrity, the spatial pattern of Liuli River Wetland Park was optimized by optimizing landscape structure, regulating the hydrological circulation process and hydrological cycle process, and optimizing the spatial configuration of Liuli River Wetland Park, so as to achieve the purpose of improving the function of the study area. The results showed that the study area could be divided into 2 primary functional zones and 9 secondary functional zones. Through regulation of hydrologic circulation process and hydrologic cycle process, the water areas increased by 0.68 km 2. Based on pattern optimization and hydrologic regulation, the space optimization scheme including patch configuration and corridor configuration was proposed. The number of patches might increase by 924, the wetland area increased by 146.51% and the functions of water purification, species conservation, ornamental and educational functions were greatly improved in the study area after optimal configuration.
 Reconstruction of ecological elements in urban wetland park:a case study of Liuli River Wetland Park in Beijing LI Binglun,WANG Wenjie,HU Yuanman,LIU Miao,BU Rencang,SHI Sixue,XIONG Zaiping 2020, 10 (1):  32-38.  doi: 10.12153/j.issn.1674-991X.20190164 Abstract ( 2 )   HTML ( 2 )   PDF (12071KB) ( 1 )   Wetland vegetation is one of the important indicators for evaluating the spatial structure, function and process of wetlands. In the light of the problems of few vegetation types, poor water quality, low landscape diversity and poor ornamental effect in Liuli River Wetland Park in Beijing, aiming at the realization of water purification, species conservation, ornamental and science popularization of the wetland, the main river channel was optimization and new wetland construction were studied. Based on current landuse status and restoration objectives of the study area, three functional areas of wetland restoration, i.e. water purification functional area, species conservation functional area and ornamental and science popularization functional area, as well as their overall layout were proposed. For different functional areas, the reconstruction schemes of wetland ecological elements were proposed from the aspects of base restoration and vegetation allocation. In the scheme, an area of 1.13 km 2 of wetland was optimized and constructed, and 28 vegetation communities were allocated. This scheme could improve the ornamental functions of the study area while taking into account the purification of water quality and species conservation function.
 Transport characteristics of PM2.5 of heavy pollution weather in Tianjin in summer MENG Lihong,HAO Tianyi,LI Peiyan,WU Bingui,WANG Xuelian 2020, 10 (1):  39-46.  doi: 10.12153/j.issn.1674-991X.20190058 Abstract ( 5 )   HTML ( 2 )   PDF (9842KB) ( 5 )   Based on the data of environmental monitoring, conventional meteorological observation and NCEP reanalysis, aerosol lidar and HYSPLIT model were used to analyze one PM2.5 heavy pollution process in Tianjin in summer on Aug.1 and Aug.2, 2018. The results showed that the weak pressure of surface field, temperature-inversion layer in the boundary and east warm-humid airflow accelerated the accumulation of pollutants. Aerosol lidar analysis showed that the pollution process had obvious horizontal and vertical distribution characteristics. The increasing of PM2.5 concentration in urban area was not only related to the horizontal transport, but also closely related to the accumulation of pollutants caused by temperature-inversion layer in the boundary. The backward trajectory tracking by HYSPLIT model showed that in the early stage of cumulative climb of PM2.5, air masses mainly came from south, and the air masses had obvious settlement at 200, 500 and 1 000 m altitudes during the climbing phase of PM2.5 concentration. The eastward warm airflow brought the clearer air as well as a lot of moisture, which resulted the increasing of relative humidity during the later stage pollution. The static weather situation caused the accumulation of pollutants on the early stage, while and the transportation of pollutants between the urban areas of Tianjin as well as the increasing of relative humidity caused by the eastward warm humid airflow aggravated pollution on the later stage.
 The suppression effect and safety evaluation of poly-γ-glutamic acid, a novel biological dust suppressant YUAN Dandan,CHEN Mian,LIU Junxiang,GAO Liang,LIU Fei,ZHANG Xiaoyuan,HAO Ronghua,CHEN Lei,ZHANG Yanyan 2020, 10 (1):  47-55.  doi: 10.12153/j.issn.1674-991X.20190084 Abstract ( 3 )   HTML ( 2 )   PDF (9004KB) ( 3 )   The dust suppression effect of poly-γ-glutamic acid (γ-PGA) was studied and its safety was evaluated. The dust suppression effects of γ-PGA at different molecular weight, concentration and coordinated-effects with various polysaccharides were investigated respectively by filter paper loading dust and periodic simulation of wind erosion. The effect of γ-PGA on dust removal was tested by smog simulating dust. The effects of γ-PGA on seed germination of Poa pratensis L. and corrosion of carbon steel were investigated separately. The results showed that the dust suppression rate of high molecular weight γ-PGA was higher and only decreased by 10.6% within 12 days. The dust suppression rate of 0.100%γ-PGA was higher than other groups at 1st, 3rd, 7nd and 12th day. When γ-PGA was mixed with hyaluronic acid or xanthan gum in a ratio of 2:1, the dust suppression rates were higher than γ-PGA was used alone. After spraying 0.100% γ-PGA, the sedimentation rate of particles was significantly faster than that of natural sedimentation rate, especially for particles with small particle size. γ-PGA could promote growth of seed. The corrosion rate of carbon steel treated with high concentration γ-PGA was the lowest.
 Research progress on combined biological purification technologies for black and smelly water bodies WANG Haishan,ZOU Ping,FU Xianping,DAI Ben,ZHU Fangfang,WANG Zitong 2020, 10 (1):  56-62.  doi: 10.12153/j.issn.1674-991X.20190038 Abstract ( 12 )   HTML ( 7 )   PDF (890KB) ( 5 )   At present, black and smelly water bodies appear in many cities and towns in China, so it is urgent to strengthen the control of black and smelly water bodies in cities and towns. The definition, formation process, characteristics of black and smelly water bodies and the present situation of treatment of them in China were introduced, the common methods of treatment were summarized, and the advantages and importance of biotechnology were put forward. The technical idea of combining biological technologies to treat black and smelly water bodies was expounded, which was to purify the water through several links of artificial aeration, adding bacteria agent, adding growth-promoting agent, adding fillers and planting aquatic plants. The purification principle of different links, main technical measures and research progress of combinatorial biotechnology were reviewed. The comprehensive application and effect of combinatorial biotechnology were summarized, and the future research direction of combinatorial biotechnology was prospected. It aims to provide a diversified view and reasonable control framework for the purification of black and smelly water bodies by combination technology.
 Dredging technology and its effect on the treatment of polluted water LIU Lixiang,HAN Yongwei,LIU Hui,MENG Xiaojie,GAO Xinting,HOU Chunfei,XIONG Xiangyan,KE Yan 2020, 10 (1):  63-71.  doi: 10.12153/j.issn.1674-991X.20190045 Abstract ( 3 )   HTML ( 2 )   PDF (1061KB) ( 2 )   Sludge dredging is one of the effective ways to control internal pollution sources of polluted water. In order to deeply understand the application of dredging technology and the treatment effects on water pollution, the application of sludge dredging technology, its treatment effects and the effluences on the ecosystem of polluted water were summarized by literature review. It was found that the environmental sludge dredging efficiency was the higher than the grab sludge dredging efficiency, and there were few reports on the efficiency of other sludge dredging methods. Dredging technology was widely used, but after the application of the dredging engineering, the influence of sludge dredging on polluted water quality had both obvious and unapparent sides. The time effect characteristics of dredging effectwas described, The effect of sludge dredging in polluted water could be divided into long-term, short-term and instantaneous effects, and at present, the instantaneous effect of dredging effect was common. The factors that affected the dredging effect included mechanical disturbance and dredging depth. The disturbance caused obvious release of suspended pollutants in the sediment. At present, the dredging depth range was 0-90 cm. Each dredging project had a specific optimal dredging depth with the best effect of removing nutrients. The impact of dredging on biome could be divided into short-term and long-term, with short-term impacts being reflected in biodiversity and biomass, and long-term impacts in the reconstruction of biome. Finally, the future priority areas of sludge dredging research were proposed, including the development of specialized sludge dredging equipment, precise sludge dredging technology and the impact of sludge dredging on endogenous nutrients.
 Present situation and research progress of ultrasonic algae control technology CHEN Helin,LI Yun,CHU Zhaosheng,YE Bibi,LI Guohong 2020, 10 (1):  72-78.  doi: 10.12153/j.issn.1674-991X.20190032 Abstract ( 9 )   HTML ( 3 )   PDF (897KB) ( 10 )   Ultrasonic algae control technology has great development potential and broad application prospects with the advantages of simple equipment, economical efficiency, without secondary pollution and simple management. The basic principles of ultrasonic algae control technology, the factors affecting the efficiency of algae control by ultrasound, the impact of ultrasound on water ecological environment and the algae removal efficiency of ultrasound technology combined with other technologies were reviewed. The results showed that in the case of ultrasonic algae control, the higher the intensity, the greater the energy consumption and the more the cost. Moreover, the excessive power could inhibit the growth of aquatic organisms. Considering the removal efficiency, safety and economy of algae control, the low-power ultrasonic technology was more suitable for cyanobacterial bloom control. At the same time, the combination of ultrasound and other algae control technologies could improve the efficiency of algae removal, which would be a development direction of ultrasonic control algae technology in the future.
 Impacts of vermicompost on degradation of municipal sludge GONG Zheng,WANG Hui,CHEN Xuemin,TIAN Weiping,FU Xiaoyong 2020, 10 (1):  85-90.  doi: 10.12153/j.issn.1674-991X.20190036 Abstract ( 3 )   HTML ( 4 )   PDF (773KB) ( 1 )   In order to accelerate the stabilization process of municipal sludge, the effect of vermicompost on the sludge degradation process was studied. Sludge and vermicompost were mixed with mass ration of 2:1 as the treatment group (WF), and the sludge without vermicompost was used as the control group (W). The comparison tests were conducted at (20±1)℃ for a total of 50 days. The results showed that the concentration of organic matter (OM) in the treatment group with vermicompost (WF) was 4.2% lower, the electrical conductivity (EC) and the content of N $H 4 +$ -N were elevated by 79.0% and 110.0%, respectively, and the content of N $O 3 -$ -N was declined by 83.5%. The varied range of pH value in the treatment group was lower than that in the control group during the whole experimental process. The results showed that vermicompost could promote sludge ammoniation and stabilize the pH value. Moreover, the inoculation of vermicompost could reach the purposes of a higher degree of organic matter decomposition and a faster rate of mineralization, which contributed to the rapid stabilization of municipal sludge. Vermicompost can be used as an additive to accelerate municipal sludge degradation.