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Improvement of ecological geographic regionalization based on remote sensing and canonical correspondence analysis： A case study in China

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Science China Earth Sciences 2016年第9期59卷 1745-1753页

作者： JIN JiaXin WANG Ying JIANG Hong KONG Yan LU XueHe ZHANG XiuYing Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology Nanjing University Nanjing 210023 China International Institute for Earth System Science Nanjing University Nanjing 210023 China Information Center of Urban Planning Wuxi 214072 China

Ecological geographic regions, also called eco-regions, can be used to divide a remotely sensed image, which is helpful for reducing the complexity of land cover types within eco-regions and for improving the classification accuracy of land cover. In this case study in China, we improved a method of ecological geographic regionalization that is more suitable for remote sensing mapping of regional land cover, and we obtained new eco-regions. The canonical correspondence analysis(CCA) and k-means clustering were adopted in the ecological geographic regionalization using both seasonal remotely-sensed vegetation information and environmental data including climate, elevation and soil features. Our results show that the combination of seasonal vegetation information and the CCA performed well in the selection of the dominant environmental factor of the biogeographic pattern, and it can be used as regionalization indicators of eco-regions. We found that thermal factors are the most important driving forces of the biogeographic pattern in China, which followed by moisture factors. Two global land cover products(MODIS MCD12C1 and Glob Cover) were used to assess our eco-regions. The results show that our eco-regions performed better than that of a previous study regarding the complexity of land cover types, such as in the number of types and the proportional area of the major/secondary type. These results indicate that the method of ecological geographic regionalization, which is based on environmental factors associated with seasonal vegetation features, is effective for reducing the regional complexity of land cover.

关键词： Ecological geographic regionalization Remote sensing canonical correspondence analysis k-means clustering Land cover

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canonical correspondence analysis of Phytoplankton Community and Environmental Factors in Genhe River

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Asian Agricultural Research 2017年第9期9卷 24-27页

作者： Zhenjiang WANG Hongxian YU College of Wildlife Resources Northeast Forestry University

To understand the status of phytoplankton community of the Genhe River in the summer of 2015,we investigated the phytoplankton in Genhe River. We identified 5 phyla and 36 species,among which Bacillariophyta(23) were the most,followed by Chlorophyta(10),Cyanophyta(1),Chrysophyta(1),Pyrrophyta(1). The phytoplankton abundance was(15. 6-810) × 104 ind·L^(-1); the biomass was(0. 07-2. 876) mg·L-1; Shannon-wiener index was 1. 05-3. 24; Pielou evenness index was 0. 27-0. 96. Using Shannon-wiener index and Pielou index,the water quality of Genhe River was assessed,and the results showed that the water quality was the best at 5# sampling point,the water quality was good in 3#,4#,7#,8#,9# sampling points,and there was a state of pollution at other sampling points. canonical correspondence analysis and Pearson correlation analysis showed that iron ion,transparency,p H value,water depth and water temperature were important environmental factors that affect the distribution of phytoplankton,and copper ion,nitrite ion and COD also significantly affected the distribution of phytoplankton.

关键词： Phytoplankton canonical correspondence analysis Community structure

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Seasonal variation of Microcystis in Lake Taihu and its relationships with environmental factors

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Journal of Environmental Sciences 2009年第7期21卷 892-899页

作者： TAN Xiao KONG Fanxiang ZENG Qingfei CAO Huansheng QIAN Shanqin ZHANG Min State Key Laboratory of Lake Science and Environment Nanjing Institute of Geography and Limnology Chinese Academy of Sciences Nanjing 210008 China Graduate School of Chinese Academy of Sciences Beijing 100049 China Department of Biological Sciences Fordham University New York 10458 USA

In order to monitor the changes of Microcystis along with temporal and spatial variations, seasonal variation of Microcystis in Lake Taihu was investigated by 16S-23S rRNA internal transcribed spacer denaturing gradient gel electrophoresis （16S-23S rRNA-ITS DGGE） and microscopic evaluation. Samples were collected quarterly at four sites （River Mouth, Meiliang Bay, Cross Area, and Lake Center） from August 2006 to April 2007. Results showed that Microcystis dominated total phytoplankton abundance at the four sites in all seasons except winter. The average annual abundance of Microcystis was relatively high at River Mouth and Meiliang Bay, reaching 81.22×10^6 and 61.32×10^6 cells/L, respectively. For temporal variations, Shannon-Wiener diversity index （H＇） according to DGGE profile revealed the richness of Microcystis in summer （H＇ = 1.375±0.034） and winter （H＇ = 1.650 ±0.032） was lower than that in spring （H＇ = 2.078 ±0.031） and autumn （H＇ = 2.365 ±0.032）（P 〈 0.05）. While for spatial variations, the richness of Microcystis at River Mouth （H＇ = 2.015± 0.074） was higher than at other sites during four seasons （P 〈 0.01）. Very few differences of Microcystis diversity in the same season were observed among the other three sites （P 〉 0.05）. canonical correspondence analysis （CCA） was performed to elucidate the relationships between Microcystis operational taxonomic units （OTUs） composition and the environmental factors. Results of CCA revealed that temperature was strongly positively correlated with the first axis （r = 0.963）, while TSS was negative correlated with the second axis （r = -0.716）. Phylogenetic tree based on the sequencing results of target bands on DGGE gel indicated that samples collected in summer and winter constituted two separated clusters.

关键词： Lake Taihu blooms Microcystis rRNA-ITS DGGE canonical correspondence analysis

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Distribution of Chironomidae (Insecta: Diptera) in polluted rivers of the Juru River Basin, Penang, Malaysia

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Journal of Environmental Sciences 2010年第11期22卷 1718-1727页

作者： Salman A. Al-Shami Che Salmah Md Rawi Abu HassanAhmad Siti Azizah Mohd Nor School of Biological Sciences Universiti Sains Malaysia Centre for Marine and Coastal Studies Universiti Sains Malaysia

The influence of physical and chemical parameters on the abundance and diversity of chironomids was studied in six rivers with moderate to highly polluted water in the Juru River Basin. The rivers： Ceruk Tok Kun （CTKR） as reference site, and polluted rivers of Pasir （PR）, Juru （JR）, Permatang Rawa （PRR）, Ara （AR） and Kilang Ubi （KUR） were sampled over a period of five months （November 2007–March 2008）. Nine chirnomid species： Chironimus kiiensis, C. javanus, Polypedilum trigonus, Microchironomus sp., Dicrotendipes sp., Tanytarsus formosanus, Clinotanypus sp., Tanypus punctipennis and Fittkauimyia sp. were identified. Assessment of their relationships with several environmental parameters was performed using the canonical correspondence analysis （CCA）. Tanytarsus formosanus was the most dominant in the relatively clean CTKR and moderately polluted JR with mean densities of 19.66 and 25.32 m 2 , respectively while C. kiiensis was abundant in more polluted rivers. Tanytarsus formosanus, Dicrotendipes sp. and Microchironomus sp. were grouped under moderate to high water temperature, total organic matter （TOM）, total suspended solids （TSS）, velocity, pH, phosphates and sulphates. However, Tanypus punctipennis, Fittkauimyia sp., and Clinotanypus sp. were associated with high contents of river sediment such as TOM, Zn and Mn and water ammonium-N and nitrate-N and they were associated with higher dissolved oxygen （DO） content in the water. Chironomus kiiensis, C. javanus and P. trigonus showed positive relationships with TOM, ammonium-N and nitrate-N as well as trace metals of Zn, Cu and Mn. These three species could be considered as tolerant species since they have the ability to survive in extreme environmental conditions with low DO and high concentrations of pollutants. Based on the water parameter scores in all rivers, the highest diversity of chironomid larvae was reported in CTKR. With higher concentrations of organic and/or inorganic pollutants as reported in PPR, K

关键词： chironomid larvae Juru River physicochemical parameters canonical correspondence analysis

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Nano-and microphytoplankton community characteristics in brown tide bloom-prone waters of the Qinhuangdao coast,Bohai Sea, China

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Science China Earth Sciences 2017年第6期60卷 1189-1200页

作者： XU Xin YU ZhiMing HE LiYan CHENG FangJin CAO XiHua SONG XiuXian Key Laboratory of Marine Ecology and Environmental Sciences Institute of Oceanology Chinese Academy of Sciences Qingdao 266071 China University of Chinese Academy of Sciences Beijing 100049 China Laboratory for Marine Ecology and Environmental Science Qingdao National Laboratory for Marine Science and Technology Qingdao 266071 China

Since 2009, the newly recorded species Aureococcus anophagefferens has successively induced brown tides in the Qinhuangdao coastal waters of the Bohai Sea. Here, we focus on the phytoplankton community structure in this region and try to point out the biological background characteristics of the outbreaks of successive brown tides. We analyzed species composition,cell abundance, diversity indices and size-fractionated chlorophyll a(Chl-a) concentration monthly from March 2013 to January2014. The phytoplankton community, as observed by microscopy, underwent succession from nano-celled chained diatoms to dinoflagellates in the spring and summer, and then to micro-celled diatoms and nano-celled chained diatoms as the most prominent groups in the subsequent autumn and winter. canonical correspondence analysis revealed that changes in the abundance of diatoms were related to nutrient availability, especially of nitrogen, while water temperature was the crucial factor influencing the abundance of dinoflagellates and A. anophagefferens. Considering the contribution of nano-celled chained species to the micro-sized Chl-a,small phytoplankton(<20 μm) composed the majority of total Chl-a and were generally abundant during our study. Abundant and diverse small phytoplankton seemed to serve as a background or seedbank for the formation of blooms of A. anophagefferens and other small-celled algae.

关键词： Phytoplankton community Qinhuangdao coast Species composition Cell abundance Size fractions canonical correspondence analysis Aureococcus anophagefferens

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Effect of river plume on phytoplankton community structure in Zhujiang River estuary

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Journal of Oceanology and Limnology 2021年第2期39卷 550-565页

作者： Qi ZHONG Bing XUE Md Abu NOMAN Yuqiu WEI Haijiao LIU Hongbin LIU Liping ZHENG Hongmei JING Jun SUN Institute of Marine Science and Technology Shandong UniversityQingdao 266200China Research Centre for Indian Ocean Ecosystem Tianjin University of Science and TechnologyTianjin 300457China Tianjin Key Laboratory of Marine Resources and Chemistry Tianjin University of Science and TechnologyTianjin 300457China Department of Ocean Science and Division of Life Science Hong Kong University of Science and TechnologyHong Kong 999077China Institute of Deep-sea Science and Engineering Chinese Academy of SciencesSanya 572000China

To examine the phytoplankton assemblages and the effect of diluted waters on them,a research cruise was conducted from July 19 to August 7,2015 in the Zhujiang(Pearl)River estuary in the northern South China Sea(21°N–23.5°N,111°E–117°E).Samples were collected from 65 stations including one for time-series sampling.A total of 212 phytoplankton taxa were identified from 61 genera belonging to 4 *** them,122 species identified from 42 genera of Bacillariophyta and 83 species from 15 genera of ***-forming diatoms dominated the phytoplankton community where Pseudonitzschia delicatissima,Guinardia striata,Thalassionema nitzschioides,and *** comprised about 52%of the total ***,higher cell abundances concentrated on both sides of the estuary,because of low salinity and high nutrients brought by diluted *** addition,canonical correspondence analysis revealed that salinity and dissolved inorganic nitrogen shaped the species composition in the study ***,the Jaccard similarity index showed prevailing high similarity in the distribution of species in low-salinity diluted waters,and the Bray-Curtis similarity depicted distinguished grouping for phytoplankton assemblages along the salinity ***,phytoplankton diel vertical cycles showed maximum abundance occurred at 2:00 am,which was mainly contributed by benthic phytoplankton species Pseudo-nitzschia *** ***.

关键词： phytoplankton canonical correspondence analysis diel cycle Zhujiang(Pearl)River estuary

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Variation of Soil Nutrition in a Fagus engleriana Seem.-Cyclobalanopsis oxyodon Oerst, Community Over a Small Scale in the Shennongjia Area, China

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Journal of Integrative Plant Biology 2006年第7期48卷 767-777页

作者： MiZhang Zong-Qiang Xie Gao-Ming Xiong Jin-Tun Zhang Laboratory of Quantitative Vegetation Ecology Institute of Botany the Chinese Academy of Sciences Beijing 100093 China School of Graduate the Chinese Academy of Sciences Beijing 100039 China College of Life Sciences Beijing Normal University Beijing 100875 China

Soil nutrition is a key factor influencing species composition in a community, but it has clearly scaledependent heterogeneity. In the present study, geostatistics methods and canonical correspondence analysis （CCA） were used to detect：（i） the variation range of soil spatial heterogeneity; （ii） the influence of topographic factors on the distribution of soil nutrition; and （iii） the relationships between soil chemical properties and species in the community. In all, 23 soil variables were measured, including total N and organic C, AI, Ba, Ca, Cr, Cu, Fe, Ga, Li, Mg, Mn, Na, NH4-N, Ni, NO3-N, Pb, pH, P, Sr, Ti, V, and Zn. Semi-variograms of these variables were calculated and mapped. All indices showed autocorrelatlons, with ranges between 29 and 200 m. When the sample method was larger than these distances, spatial autocorrelations were avoided. The distribution patterns of Ca, Cr, Ga, K, Mg, organic C, P, Pb, and pH, and total N were related to the microtopography and the distribution of these compounds was clumped in water catchments area. The CCA method was used to investigate the relationship between plant species and soil properties in this community. Fagus engleriana Seem., Lindera obtusiloba BI. Mus., and Acer griseum （Franch.） Pax were correlated with organic C, available N, and P.

关键词： biodiversity beech canonical correspondence analysis soil chemical properties topographic factors.

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Seasonal microbial community shift in a saline sewage treatment plant

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Frontiers of Environmental Science & Engineering 2011年第1期5卷 40-47页

作者： Qingmei YAN Xuxiang ZHANG Tong ZHANG Herbert H P FANG Environmental Biotechnology Lab Department of Civil EngineeringThe University of Hong KongHong KongChina

Activated sludge was monthly sampled from a saline sewage treatment plant of Hong Kong(China)during June 2007 to May 2008 to analyze the microbial community shift along with environmental variations using denaturing gradient gel electrophoresis of polymerase chain reaction amplified 16S rDNA *** changes resulted into a seasonal microbial community shift characterized by alterations in species number and abundance in the sewage treatment *** analysis and cluster analysis on community structure profile showed that the 12 monthly samples fell into four groups,which is in accordance with season changing in Hong *** correspondence analysis revealed that PO_(4)^(3-)-P and NH_(4)^(+)-N posed more significant effects on community structure than total phosphorus and total nitrogen,*** with sludge retention time,influent total phosphorus had an inverse effect on the community structure shift,and chemical oxygen demand and NH_(4)^(+)-N showed a similar *** of this study may contribute to the development of new knowledge involving the microbial community shift in sewage treatment plants.

关键词： sewage treatment plants polymerase chain reaction(PCR) denaturing gradient gel electrophoresis(DGGE) canonical correspondence analysis correspondence analysis

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Relationship between phytoplankton composition and environmental factors in the surface waters of southern South China Sea in early summer of 2009

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Acta Oceanologica Sinica 2012年第3期31卷 109-119页

作者： KE Zhixin TAN Yehui HUANG Liangmin ZHANG Jianlin LIAN Shumin Key Laboratory of Marine Bio-resources Sustainable Utilization South China Sea Institute of OceanologyChinese Academy of ScienceGuangdong 510301China

Horizontal distributions of phytoplankton abundance,species composition as well as environmental factors were investigated in the surface waters of southern South China Sea (SCS) in early summer (May 16 to June 7) of *** most areas of southern SCS,the concentrations of nitrogen and phosphorus were very low and DIN/DIP ratios usually were lower than the Redfield N/P Ratio of 16∶*** nutrients were significant lower in the upwelling region off Vietnam.A total of 144 taxa of phytoplankton were identified in the study *** dominant genera were Prorocentrum,Gonyaulax,Gyrodinium,Scrippsiella and Chaetoceros,*** patterns of early-summer phytoplankton abundance and species composition should be mainly controlled by the upwelling off Vietnam and the discharge of Mekong River in the southern *** dominated in the nutritious Mekong River Estuary or upwelling region off Vietnam; while dinoflagellates dominated in the oligotrophic pelagic *** canonical correspondence analysis (CCA) indicates that most of diatoms favor higher levels of silicate and phosphorus,as well as lower temperature; while most of dinoflagellates favor the lower silicate and phosphorous and higher *** and CCA results indicate that silicate,nitrate and temperature were the most relevant environmental factors to regulate the horizontal pattern of early-summer phytoplankton in the surface waters of southern SCS.

关键词： phytoplankton species composition nutrient canonical correspondence analysis South China Sea

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Effects of Soil Depth and Season Variation on Community Structure of Arbuscular Mycorrhizal Fungi in Greenhouse Soils Planted with Watermelon

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Pedosphere 2013年第3期23卷 350-358页

作者： LIU Run-Jin LI Yan DIAO Zhi-Kai LI Min LIN Xian-Gui Institute of Mycorrhizal Biotechnology Qingdao Agricultural University State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil Science Chinese Academy of Sciences

The characteristics of arbuscular mycorrhizal fungal (AMF) community structure in various soil depths and growing seasons of watermelon (Citrullus vulgaris) grown in commercial greenhouses in Daxing of Beijing and Weifang and Laiyang of Shandong, China were investigated using both morphological identification and denaturing gradient gel electrophoresis. The sampled soils had been used for continuous greenhouse production of watermelon for 0, 5, 10, 15, or 20 years. Glomus claroideum was the dominant species in the greenhouse soils planted for 5, 10, and 15 years in Laiyang, while Glomus mosseae and Glomus etunicatum were dominant in the nearby open farmland soil. Sorenson's similarity index of AMF community composition ranged from 0.67 to 0.84 in the soils planted for 5 years, and from 0.29 to 0.33 for 20 years among the three locations. Spore abundance, species richness, and the Shannon index were highest near the soil surface (0-10 cm) and decreased with soil depth, and higher in June and October than in August and December. canonical correspondence analysis showed that available P and the number of years that soil had been used for greenhouse production were the main factors contributing to the variance of AMF community composition. It was concluded that the community structure of AMF was mainly influenced by soil available P and planting time of watermelon as well as by soil depth and seasonal variation in the commercial greenhouse.

关键词： canonical correspondence analysis Shannon index Sorenson's similarity index species richness spore abundance

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