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Methylmercury and sulfate-reducing bacteria in mangrove sediments from Jiulong River Estuary,China

Journal of Environmental Sciences 2011年第1期23卷 14-21页

作者： Hao Wu Zhenhua Ding Yang Liu Jinling Liu Haiyu Yan Jiayong Pan Liuqiang Li Huina lin guanghui lin Haoliang Lu Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems and School of Life Sciences Xiamen University Xiamen 361005 China State Key Laboratory of Environmental Geochemistry Institute of Geochemistr) Chinese Aeademy of Sciences Guiyang 550002 China Key Laboratory of Nuclear Resources and Environment East China Institute of Technology Minist~ of Education Nanchang 330013 China

Estuaries are important sites for mercury （Hg） methylation, with sulfate-reducing bacteria （SRB） thought to be the main Hg methylators. Distributions of total mercury （THg） and methylmercury （MeHg） in mangrove sediment and sediment core from Jiulong River Estuary Provincial Mangrove Reserve, China were determined and the possible mechanisms of Hg methylation and their controlling factors in mangrove sediments were investigated. Microbiological and geochemical parameters were also determined. Results showed that SRB constitute a small fraction of total bacteria （TB） in both surface sediments and the profile of sediments. The content of THg, MeHg, TB, and SRB were （350 ± 150） ng/g, （0.47 ± 0.11） ng/g, （1.4× 10^011 ± 4.1 × 10^9） cfu/g dry weight （dw）, and （5.0× 10^6 d： 2.7 × 10^6） cfu/g dw in surficial sediments, respectively, and （240 ± 24） ng/g, （0.30 ± 0.15） ng/g, （1.9 × 10^11 ± 4.2 × 10^9） cfu/g dw, and （1.3 × 10^6 ± 2.0 × 10^6） cfu/g dw in sediment core, respectively. Results showed that THg, MeHg, TB, MeHg/THg, salinity and total sulfur （TS） increased with depth, but total organic matter （TOM）, SRB, and pH decreased with depth. Concentrations of MeHg in sediments showed significant positive correlation with THg, salinity, TS, and MeHg/THg, and significant negative correlation with SRB, TOM, and pH. It was concluded that other microbes, rather than SRB, may also act as main Hg methylators in mangrove sediments.

关键词： mercury methylmercury sediment mangrove sulfate-reducing bacteria

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Recent progresses in mangrove conservation,restoration and research in China

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Journal of Plant Ecology 2009年第2期2卷 45-54页

作者： Luzhen Chen Wenqing Wang Yihui Zhang guanghui lin Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems School of Life SciencesXiamen UniversityXiamen 361005China Department of Biology School of Life SciencesXiamen UniversityXiamen 361005China State Key Laboratory of Marine Environmental Science Xiamen UniversityXiamen 361005China

Aims In this paper,we highlighted some key progresses in mangrove conservation,restoration and research in China during last two decades.Methods Based on intensive literature review,we compared the distribution and areas of existing mangroves among selected provinces of China,discussed the issues associated with mangrove conservation and restoration and highlighted major progresses on mangrove research conducted by key institutions or universities in China's Mainland,Hong Kong,Taiwan and Macao.Important findings The population boom and rapid economic developments have greatly reduced mangrove areas in China since 1980s,leaving only 22700 ha mangroves in China's Mainland in 2001.Chinese government has launched a series of programs to protect mangroves since 1980s and has established mangrove ecosystems as high-priority areas for improving environmental and living resource management.During last three decades,a total of 34 natural mangrove conservation areas have been established,which accounts for 80%of the total existing mangroves areas in China.Mangrove restoration areas in China' Mainland accounted for<7%of the total mangroves areas in 2002.A great deal of research papers on Chinese mangroves has been published in international journals.However,more systematic protection strategies and active restoration measurements are still urgently needed in order to preserve these valuable resources in China.

关键词： China conservation mangrove research restoration

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Coastal blue carbon in China as a nature-based solution toward carbon neutrality

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The Innovation 2023年第5期4卷 109-123页

作者： Faming Wang Jihua Liu Guoming Qin Jingfan Zhang Jinge Zhou Jingtao Wu Lulu Zhang Poonam Thapa Christian J.Sanders Isaac R.Santos Xiuzhen Li guanghui lin Qihao Weng Jianwu Tang Nianzhi Jiao Hai Ren Xiaoliang Research Station of Tropical Coastal Ecosystems Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystemsand the CAS Engineering Laboratory for Ecological Restoration of lsland and Coastal EcosystemsSouth China Botanical GardenChinese Academy of SciencesGuangzhou 510650China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 510650China Marine Research Institute Shandong UniversityQingdao 266237China University of Chinese Academy of Sciences Beijing 100049China National Marine Science Centre Faculty of Science and EngineeringSouther Cross UniversityCoffs HarbourNSW 2450Australia Department of Marine Sciences University of Gothenburg41319 GothenburgSweden State Key Laboratory of Estuarine and Coastal Research and Instiute of Eco-Chongming East China Normal UniversityShanghai 201100China Key Laboratory for Earth System Modeling Ministry of EducationDepartment of Earth System ScienceTsinghua UniversityBejing 100084China Laboratory of Stable Isotope and Gulf Ecology Institute of Ocean EngineeringTsinghua's Shenzhen International Graduate SchoolShenzhen 518055China Department of Land Surveying and Geo-nformatics The Hong Kong Polytechnic UniversiyHongkong 99077China Innovative Research Center for Carbon Neutralization Global ONCE ProgramXiamen 361005China

To achieve the Paris Agreement,China pledged to become“Carbon Neutral”by the 2060s.In addition to massive decarbonization,this would require significant changes in ecosystems toward negative CO_(2)emissions.The ability of coastal blue carbon ecosystems(BCEs),including mangrove,salt marsh,and seagrass meadows,to sequester large amounts of CO_(2)makes their conservation and restoration an important“nature-based solution(NbS)”for climate adaptation and mitigation.In this review,we examine how BCEs in China can contribute to climate mitigation.On the national scale,the BCEs in China store up to 118 Tg C across a total area of 1,440,377 ha,including over 75%as unvegetated tidal flats.The annual sedimental C burial of these BCEs reaches up to 2.06 Tg C year^(−1),of which most occurs in salt marshes and tidal flats.The lateral C flux of mangroves and salt marshes contributes to 1.17 Tg C year^(−1)along the Chinese coastline.Conservation and restoration of BCEs benefit climate change mitigation and provide other ecological services with a value of$32,000 ha^(−1)year^(−1).The potential practices and technologies that can be implemented in China to improve BCE C sequestration,including their constraints and feasibility,are also outlined.Future directions are suggested to improve blue carbon estimates on aerial extent,carbon stocks,sequestration,and mitigation potential.Restoring and preserving BCEs would be a cost-effective step to achieve Carbon Neutral by 2060 in China despite various barriers that should be removed.

关键词： tidal coastal carbon

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Responses of soil respiration to simulated precipitation pulses in semiarid steppe under different grazing regimes

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Journal of Plant Ecology 2008年第4期1卷 237-246页

作者： Shiping Chen guanghui lin Jianhui Huang Mao He State Key Laboratory of Vegetation and Environmental Change Institute of BotanyChinese Academy of SciencesBeijing 100093China

Aims Precipitation pulses and different land use practices(such as grazing)play important roles in regulating soil respiration and carbon balance of semiarid steppe ecosystems in Inner Mongolia.However,the interactive effects of grazing and rain event magnitude on soil respiration of steppe ecosystems are still unknown.We conducted a manipulative experiment with simulated precipitation pulses in Inner Mongolia steppe to study the possible responses of soil respiration to different precipitation pulse sizes and to examine how grazing may affect the responses of soil respiration to precipitation pulses.Methods Six water treatments with different precipitation pulse sizes(0,5,10,25,50 and 100 mm)were conducted in the ungrazed and grazed sites,respectively.Variation patterns of soil respiration of each treatment were determined continuously after the water addition treatments.Important Findings Rapid and substantial increases in soil respiration occurred 1 day after the water treatments in both sites,and the magnitude and duration of the increase in soil respiration depended on pulse size.Significantly positive relationships between the soil respiration and soil moisture in both sites suggested that soil moisture was the most important factor responsible for soil respiration rate during rain pulse events.The ungrazed site maintained significantly higher soil moisture for a longer time,which was the reason that the soil respiration in the ungrazed site was maintained relatively higher rate and longer period than that in the grazed site after a rain event.The significant exponential relationship between soil temperature and soil respiration was found only in the plots with the high water addition treatments(50 and 100 mm).Lower capacity of soil water holding and lower temperature sensitivity of soil respiration in the grazed site indicated that degraded steppe due to grazing might release less CO_(2) to the atmosphere through soil respiration under future precipitation and temperature scenarios.

关键词： soil CO_(2)efflux degraded steppe precipitation pulse size Q10 value

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印染行业水资源论证节水评价分析

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染整技术 2024年第5期46卷 49-52页

作者：林光辉李琳上海纺织建筑设计研究院有限公司上海200060

开展建设项目节水评价是保证建设项目科学合理取用水的有效手段,而印染行业是我国高耗水行业,故而提升行业用水效率对节水型社会的建设具有重要作用。基于印染技术改造项目水资源论证报告中的节水评价内容,对该项目用水概况进行分析,通... 详细信息

开展建设项目节水评价是保证建设项目科学合理取用水的有效手段,而印染行业是我国高耗水行业,故而提升行业用水效率对节水型社会的建设具有重要作用。基于印染技术改造项目水资源论证报告中的节水评价内容,对该项目用水概况进行分析,通过节水政策合理性及用水水平先进性进行节水符合性评价,对已开展的节水措施进行评价,并分析存在的节水潜力。

关键词：印染节水评价用水效率水资源论证

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Biophysical regulations of NEE light response in a steppe and a cropland in Inner Mongolia

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Journal of Plant Ecology 2012年第2期5卷 238-248页

作者： Ping Zhang Shiping Chen Wenli Zhang Haixia Miao Jiquan Chen Xingguo Han guanghui lin Institute of Botany The Chinese Academy of SciencesState Key Laboratory of Vegetation and Environmental ChangeBeijing 100093People’s Republic of China Graduate University of Chinese Academy of Sciences Beijing 100049People’s Republic of China College of Chemistry and Life Science China Three Gorges UniversityYi ChangHubei 443002People’s Republic of China Department of Environmental Sciences University of ToledoToledoOH 43606USA Research Center for Earth System Science Tsinghua UniversityBeijing 100084People’s Republic of China

Aims Ecosystem carbon models often require accurate net ecosystem exchange of CO_(2)(NEE)light-response parameters,which can be derived from the Michaelis–Menten equation.These parameters include maximum net ecosystem exchange(NEE_(max)),apparent quantum use efficiency(a)and daytime ecosystem respiration rate(R_(e)).However,little is known about the effects of land conversion between steppe and cropland on these parameters,especially in semi-arid regions.To understand how these parameters vary in responses to biotic and abiotic factors under land conversions,seasonal variation of light-response parameters were evaluated for a steppe and a cropland of Inner Mongolia,China,during three consecutive years(2006–08)with different precipitation amounts.Methods NEE was measured over a steppe and a cropland in Duolun,Inner Mongolia,China,using the eddy covariance technique,and NEE light-response parameters(NEE_(max),α and R_(e))were derived using the Michaelis–Menten model.Biophysical regulations of these parameters were evaluated using a stepwise regression analysis.Important Findings The maximum absolute values of NEE_(max) occurred in the meteorological regimes of 15℃

关键词： climate change ecosystem respiration land-use conversion net ecosystem exchange quantum use efficiency

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嵩明县花卉示范园区花卉旅游发展探究

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广东蚕业 2024年第3期58卷 132-134页

作者：陶程鹏林光辉西南林业大学经济管理学院云南昆明650000 云南林业职业技术学院云南昆明650000

云南省嵩明县花卉示范园区作为云南省花卉产业的重点产业园之一,是全省云花产业创新源头和高品质鲜花主产区,也是全国重要的种苗研发和推广示范中心。文章基于康养的视角,对比该花卉示范园区与周边地区的花卉旅游现状,通过实地调研分析... 详细信息

云南省嵩明县花卉示范园区作为云南省花卉产业的重点产业园之一,是全省云花产业创新源头和高品质鲜花主产区,也是全国重要的种苗研发和推广示范中心。文章基于康养的视角,对比该花卉示范园区与周边地区的花卉旅游现状,通过实地调研分析其花卉旅游中存在的优势及劣势,提出了优化对策建议,以期助力花卉旅游成为“新”的经济增长点,推进嵩明县的花卉产业和旅游产业高质量融合发展。

关键词：花卉产业花卉旅游经济增长融合发展高质量发展嵩明县

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Effect of rain enrichment on soil respiration of Nitraria sphaerocarpa community in a hyperarid area

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Research in Cold and Arid Regions 2013年第6期5卷 722-732页

作者： DianJun Liu Bo Wu YongHua Li guanghui lin ShiPing Chen YaJuan Zhu Qi Lu Bin Yao Institute of Desertification Studies Key Laboratory of Tree Breading and Cultivation of State Forestry AdministrationChinese Academy of Forestry Inner Mongolia Hydraulic Research Institute Center for Earth System Science Tsinghua University State Key Laboratory of Vegetation and Environmental Change Institute of Botany Chinese Academy of Sciences

In order to analyze the effect of rain enrichment on soil respiration rate of a Nitraria sphaerocarpa community, we measured soil respiration rate in bare and vegetated areas in a hyperarid area （Dunhuang） during the growing season. Results show that rain enrichment can increase bare and vegetated soil respiration rates. The more rainfall enrichment, the greater the increment and the longer duration time effect for soil respiration rate. 200% （16 mm） and 300% （24 mm） of rain enrichment can significantly increase bare soil respiration rates by 90% and 106% （P〈0.01）, respectively. By contrast, areas with 100% （8 mm）, 200% （16 mm） and 300% （24 mm） of rain enrichment can significantly increase shrub area respiration rates by 68%, 157% and 205% （P〈0.01）, respectively. The response time of bare and vegetated soil respiration to rainfall enrichment is asynchronous. Response variable of soil respiration in vegetated soil is higher （118%） than in bare soil. There was significant positive correlation between soil respiration rate and soil water content during the growing season （P〈0.01）. For every 1 mm increment of precipitation, soil respiration rate increased by 0.01 and 0.04 pmol/（m2.s）, respectively in vegetated and bare soils.

关键词： soil respiration rain enrichment Nitraria sphaerocarpa soil water content

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Adaptively Enhancing Facial Expression Crucial Regions via a Local Non-local Joint Network

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Machine Intelligence Research 2024年第2期21卷 331-348页

作者： guanghui Shi Shasha Mao Shuiping Gou Dandan Yan Licheng Jiao lin Xiong School of Artificial Intelligence Xidian UniversityXi'an 710000China Applied Research Laboratory Sense TimeXi'an 710000China

Facial expression recognition(FER)is still challenging due to the small interclass discrepancy in facial expression data.In view of the significance of facial crucial regions for FER,many existing studies utilize the prior information from some annotated crucial points to improve the performance of FER.However,it is complicated and time-consuming to manually annotate facial crucial points,especially for vast wild expression images.Based on this,a local non-local joint network is proposed to adaptively enhance the facial crucial regions in feature learning of FER in this paper.In the proposed method,two parts are constructed based on facial local and non-local information,where an ensemble of multiple local networks is proposed to extract local features corresponding to multiple facial local regions and a non-local attention network is addressed to explore the significance of each local region.In particular,the attention weights obtained by the non-local network are fed into the local part to achieve interactive feedback between the facial global and local information.Interestingly,the non-local weights corresponding to local regions are gradually updated and higher weights are given to more crucial regions.Moreover,U-Net is employed to extract the integrated features of deep semantic information and low hierarchical detail information of expression images.Finally,experimental results illustrate that the proposed method achieves more competitive performance than several state-of-the-art methods on five benchmark datasets.

关键词： Facial expression recognition deep neural network multiple network ensemble attention network facial crucial regions

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Lamellar Spacing Selection in Regular Eutectic Solidification at Low Velocity

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Journal of Materials Science & Technology 2007年第6期23卷 851-854页

作者： guanghui MENG Xin lin Weidong HUANG State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi＇an 710072 China

Based on the Jackson and Hunt＇s analysis, the selection of lamellar spacing in regular eutectics was reexamined at low velocity. The isothermal assumption was released and the effective interface undercooling was determined by the weighted average of the eutectic phases. It is found that the lamellar spacing minimized the effective interface undercooling depends only on the intrinsic characteristics of a given system at a fixed velocity. In addition, the selection of lamellar spacing is related to the relationship between the average interracial undercoolings of the eutectic phases and the lamellar spacing. The selected lamellar spacing obviously deviated from that predicted by the Jackson and Hunt＇s analysis if the variation of the average interracial undercoolings of the solid phases with the lamellar spacing was markedly different at a constant growth rate.

关键词： Solidification Eutectic Lamellar spacing Undercooling

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