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Application of a Digital Soil Mapping Method in Producing Soil Orders on Mountain Areas of Hong Kong Based on Legacy Soil Data

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Pedosphere 2011年第3期21卷 339-350页

作者： SUN Xiao-Lin ZHAO yu-Guo ZHANG Gan-Lin WU Sheng-Chun man yu-bon WONG Ming-Hung Croucher Institute for Environmental Sciences and Department of Biology Hong Kong Baptist University Hong KongSpecial Administrative Region (China) State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil Science Chinese Academy of Sciences Nanjing210008 (China) joint Open Laboratory of Soil and Environment Institute of Soil Science Chinese Academy of Sciences and Hong KongBaptist University (China)

Based on legacy soil data from a soil survey conducted recently in the traditional manner in Hong Kong of China, a digital soil mapping method was applied to produce soil order information for mountain areas of Hong Kong. Two modeling methods （decision tree analysis and linear discriminant analysis） were used, and their applications were compared. Much more effort was put on selecting soil covariates for modeling. First, analysis of variance （ANOVA） was used to test the variance of terrain attributes between soil orders. Then, a stepwise procedure was used to select soil covariates for linear discriminant analysis, and a backward removing procedure was developed to select soil covariates for tree modeling. At the same time, ANOVA results, as well as our knowledge and experience on soil mapping, were also taken into account for selecting soil covariates for tree modeling. Two linear discriminant models and four tree models were established finally, and their prediction performances were validated using a multiple jackknifing approach. Results showed that the discriminant model built on ANOVA results performed best, followed by the discriminant model built by stepwise, the tree model built by the backward removing procedure, the tree model built according to knowledge and experience on soil mapping, and the tree model built automatically. The results highlighted the importance of selecting soil covariates in modeling for soil mapping, and suggested the usefulness of methods used in this study for selecting soil covariates. The best discriminant model was finally selected to map soil orders for this area, and validation results showed that thus produced soil order map had a high accuracy.

关键词： decision tree analysis linear discriminant analysis soil covariate selection

Biochar reduces uptake and accumulation of polycyclic aromatic hydrocarbons(PAHs) in winter wheat on a PAH-contaminated soil

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Pedosphere 2023年第6期33卷 938-947页

作者： Jinfeng WANG Huanyu BAO yu bon man Jun CAI Jia LI Benhua SUN Fuyong WU College of Natural Resources and Environment Northwest A&F UniversityYangling 712100China Engineer and Technology Academy of Ecology and Environment Shanxi Province Key Laboratory of Soil Environment and Nutrient ResourcesShanxiAgricultural UniversityTaiyuan 030031China Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China Ministry of AgricultureYangling 712100China State Key Laboratory of Urban Water Resource and Environment Harbin Institute of TechnologyHarbin 150090China Consortium on Health EnvironmentEducation and ResearchDepartment of Science and Environmental StudiesThe Education University of Hong KongTai PoHong Kong 999077China

For years, biochar has been successfully used for the remediation of polycyclic aromatic hydrocarbons(PAHs) in contaminated soils, not only for improving their removal from soil but also for reducing their uptake by crops. However, the underlying mechanism of biochar application reducing PAH uptake and accumulation in winter wheat remains unclear. Pot trials were conducted on a PAH-contaminated soil amended with bamboo biochar, coconut shell biochar,and maize straw biochar(MSB) for an entire growth period of winter wheat. Compared with no biochar control(CK), application of the three types of biochar significantly(P < 0.01) reduced grain PAH concentration, total equivalent concentration(TEC), and incremental lifetime cancer risk(ILCR), indicating that biochar application, especially MSB, reduced the risk of exposure to PAHs in wheat grain. Furthermore, all three types of biochar significantly(P < 0.05)reduced PAH uptake and accumulation in wheat roots and stems, probably because biochar application enhanced the degradation of PAHs in the rhizosphere soil. Compared with CK, application of the three types of biochar significantly(P < 0.05) reduced the concentration of PAHs in the rhizosphere soil by15.9%–33.7%. It was found that the degradation rate of high-molecular-weight(HMW) PAHs(5-and 6-ring PAHs) was significantly(P < 0.05) higher than that of low-molecular-weight(LMW) PAHs(2–4-ring PAHs) regardless of the type of biochar used. Additionally, all three types of biochar significantly increased the relative abundance of the dominant bacterial phyla and genera in soil. Redundancy and correlation analyses also showed that there was a strong correlation between the removal rate of PAHs and dominant bacteria in the rhizosphere soil. This study indicated that biochar effectively reduced the health risk from dietary exposure to PAHs in wheat grains by increasing the abundance of bacteria related to PAH degradation, promoting the biodegradation of PAHs in the rhizosphere

关键词： bamboo biochar coconut shell biochar degradation incremental lifetime cancer risk maize straw biochar rhizosphere soil total equivalent concentration toxicityequivalencyfactor

Characterizing the optimal operation of photocatalytic degradation of BDE-209 by nano-sized TiO_2

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Journal of Environmental Sciences 2012年第9期24卷 1670-1678页

作者： Ka Lai Chow yu bon man Jin Shu Zheng Yan Liang Nora Fung Yee Tam Ming Hung Wong Croucher Institute for Environmental Sciences and Department of Biology Hong Kong Baptist University Hong Kong SAR China Department of Biology and Chemistry City University of Hong Kong Hong Kong SAR China

Brominated flame retardants have been widely used in industry. There is a rapid growing public concern for their availabilities in the environment. Advanced oxidation process （AOP） is a promising and efficient technology which may be used to remove emerging chemicals such as brominated flame retardants. This study aims at investigating optimal operational conditions for the removal of BDE-209 using nano-scaled titanium（IV） oxide. The residual PBDE congeners after photocatalytical degradation of BDE-209 by TiO2 were analysed by gas chromatography-mass spectrometry （GC-MS）. It was found that the degradability of BDE-209 by TiO2 was attributed to its photocatalytic activity but not the small size of the particles. The half-life of removing BDE-209 by TiO2 was 3.05 days under visible light. Tetra- and penta-BDEs were the major degraded products of BDE-209. Optimum conditions for photocatalytical degradation of BDE-209 was found to be at pH 12 （93% ± 1%）, 5, 10, 20 mg/L （93.0% ± 1.70%, 91.6% ± 3.21%, 91.9% ± 0.952%, respectively）, respectively of humic acid and in the form of anatase/rutile TiO2 （82% ± 3%）. Hence, the efficiency of removing BDE-209 can be maximized while being cost effective at the said operating conditions.

关键词： PBDEs TiO2 photocatalysis hydroxyl radicals

Synthesis of carbon quantum dots decorating Bi_(2)MoO_(6) microspherical heterostructure and its efficient photocatalytic degradation of antibiotic norfloxacin

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Chinese Chemical Letters 2024年第8期35卷 373-378页

作者： Meijuan Chen Liyun Zhao Xianjin Shi Wei Wang yu Huang Lijuan Fu Lijun Ma School of Human Settlements and Civil Engineering Xi’an Jiaotong UniversityXi’an 710049China Key Lab of Aerosol Chemistry and Physics State Key Laboratory of Loess and Quaternary Geology(SKLLQG)Institute of Earth EnvironmentChinese Academy of SciencesXi’an 710061China

In this study,three-dimensional microspherical CQDs/Bi_(2)MoO_(6)heterostructures were synthesized using a simple alcohol-thermal *** was found that the CQDs/Bi_(2)MoO_(6)had a large specific surface area of 56.0 m^(2)/g,and the introduction of CQDs extended the light absorption spectrum from 480 nm to 496 *** utilizing the synthesized CQDs/Bi_(2)MoO_(6)composite for photocatalytic degradation of antibiotic nor-floxacin in a water environment,complete decay of norfloxacin and effective removal of total organic car-bon(TOC)were achieved within 30 *** the optimization of material synthesis and experimen-tal conditions,the optimal CQDs loading amount was determined as 200μL,the optimal CQDs/Bi_(2)MoO_(6)dosage was 0.8 g/***,the CQDs/Bi_(2)MoO_(6)worked well under a wide pH range of *** co-existence of HCO_(3)−enhanced the norfloxacin decay,while the presence of Cl^(−),NO_(3)^(−),and SO_(4)^(2−)slightly retarded *** synthesized CQDs/Bi_(2)MoO_(6)had the great potential in removing and mineralizing nor-floxacin in real aquatic environments.

关键词： Bi_(2)MoO_(6) CQDs Heterojunction Norfloxacin Photocatalysis

Profiles and removal efficiency of polycyclic aromatic hydrocarbons by two different types of sewage treatment plants in Hong Kong

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Journal of Environmental Sciences 2017年第3期29卷 196-206页

作者： yu bon man Ka Lai Chow Zhang Cheng Wing Yin Mo yung Hau Chan James Chung Wah Lam Frankie Tat Kwong Lau Wing Cheong Fung Ming Hung Wong Consortium on Health EnvironmentEducation and Research(CHEER)and Department of Science and Environmental StudiesThe Education University of Hong KongTai PoHong KongChina Department of Environmental Engineering Jinan UniversityGuangzhou 510630China State Key Laboratory in Marine Pollution Croucher Institute for Environmental SciencesHong Kong Baptist University and City University of Hong KongKowloon TongHong KongChina Department of Geography Hong Kong Baptist UniversityKowloon TongHong KongChina College of Environment Sichuan Agricultural UniversityChengdu 611130China State Key Laboratory in Marine Pollution and Research Centre for the Oceans and Human Health City University of Hong KongKowioon TongHong KongChina The Drainage Services Department The Government of the Hong Kong Special Administrative RegionHong KongChina

Sewage discharge could be a major source of polycyclic aromatic hydrocarbons （PAHs） in the coastal waters. Stonecutters Island and Shatin Sewage Treatment Works （SCISTW and STSTW） in Hong Kong, adopted chemically enhanced primary treatment and biological treatment, respectively. This study aimed at （1） determining the removal efficiencies of PAHs, （2） comparing the capabilities in removing PAHs, and （3） characterizing the profile of each individual PAHs, in the two sewage treatment plants （STPs）. Quantification of 16 PAHs was conducted by a Gas Chromatography. The concentrations of total PAHs decreased gradually along the treatment processes （from 301 ± 255 and 307 ± 217 ns/L to 14.9 ± 12.1 and 63.3 ± 54.1 ng/L in STSTW and SCISTW, respectively）. It was noted that STSTW was more capable in removing total PAHs than SCISTW with average total removal effidency 94.4% ± 4.12% us. 79.2% ± 7.48% （p 〈 0.05）. The removal of PAHs was probably due to sorption in particular matter, confirmed by the higher distribution coefficient of individual and total PAHs in solid samples （dewatered sludge contained 92.5% and 74.7% of total PAHs in SCISTW and STSTW, respectively） than liquid samples （final efffluent-total contained 7.53% and 25.3% of total PAHs in STSTW and SCISTW, respectively）. Despite the impressive capability of STSTW and SCISTW in removing PAHs, there was still a considerable amount of total PAHs （1.85 and 39.3 ks/year, respectively for the two STPs） being discharged into Hone Kon coastal waters, which would be an environmental concern.

关键词： Sewage treatment plantsPAHsRemoval efficiencySludgeSewage

Can media exposure improve stock price efficiency in China and why?

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China Journal of Accounting Research 2016年第2期9卷 83-114页

作者： Jeong-bon Kim Zhongbo yu Hao Zhang School of Accounting and Finance University of Waterloo Shenzhen Stock Exchange Research Institute College of Business City University of Hong Kong

The media in China has undergone extensive commercialization to become more market-driven over the last 35 years. Based on a sample of over two million newspaper articles, this study investigates whether the media in China has an incremental impact on stock price efficiency. We find that: as media coverage of a firm increases,(1) its stock price synchronicity decreases;(2)the probability of informed trading of its stock increases; and(3) the extent to which its stock price deviates from random walk decreases. Our interregional analysis over thirty-one provinces/regions within China reveals that the effects of the media on decreasing stock price synchronicity, increasing the probability of informed trading, and reducing stock price deviation from random walk are stronger in regions of weaker institutional *** findings suggest that a market-driven media can play the role of compensating for the underdeveloped governance institutions in transitional economies such as China.

关键词： Media exposure Stock price efficiency China

Arbuscular mycorrhizal fungi reduced the ratios of inorganic/organic arsenic in rice grains

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Arbuscular mycorrhizal fungi reduced the ratios of inorganic...

第八次全国土壤生物与生物化学学术研讨会暨第三次全国土壤健康学术研讨会

作者： Hui Li Xun Wen Chen yu bon man Chuan Wu Ming Hung Wong School of Environment Jinan University Consortium on Environment HealthEducation and Research(CHEER)and Department of Science and Environmental StudiesHong Kong Institute of Education

Rice is the staple food for three billion people,most of who reside predominantly in *** has been reported that rice grown in severely As contaminated areas can accumulate up to 0.48 mg kginorganic As in grains,which substantially exceeds the maximum contaminant level for arsenic in rice grains(0.15 mg kg inorganic As,GB2762-2005).The strategy of development for growing rice safely in the presence of As contamination may help to counteract the detrimental effects of *** this study,arbuscular mycorrhizal fungi(AMF)- Rhizophagus intraradices was inoculated to rice to investigate its effects on arsenic(As) uptake,grain As speciation,and rhizospheric As concentration of six rice cultivars grown in As-amended soil(60 mg As kg soil).The AMF inoculation induced either positive,neutral or negative responses in rice grown in As contaminated soil,suggesting that functional diversity may exist in AMF symbiosis when As is taken up and ***,both AMF and rice cultivars had significant effects(P < 0.05) on the following:grain yield;straw and root biomass;concentrations of As(Ⅲ),As(Ⅴ),DMA and total As,and the ratios of inorganic/organic As concentrations in rice grains;and As concentrations in the soil solution of rhizosphere on day 90 and 150;and of non-rhizosphere on day 90,120 and 150 in 60 mg As kg *** ratios of inorganic/organic As concentrations in rice grains of all cultivars were significantly reduced by AMF,that involved the transformation of inorganic As into less toxic organic form dimethylarsinic acid(DMA) in *** decreased significantly total As and inorganic As concentrations in rice grains of Handao *** correlations between As in the rhizospheric soil solution and As in rice grain at different periods were *** inferred that the As survey of soil solution can be an effective measure for evaluating As in grains.

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西藏打造地球第三极绿色高地的路径探析

西藏大学学报（社会科学版） 2024年第1期39卷 197-206页

作者：高宝军余成群西藏大学经济与管理学院西藏拉萨850000 中国科学院地理科学与资源研究所北京100101

西藏是我国乃至亚洲和全球最重要生态安全屏障区,生态战略地位显著。但其生态环境相当脆弱,具有不稳定性和敏感性等特点,极易受气候变化和人类活动影响。党的十八大以来,习近平生态文明思想的确立为我国新时代生态文明建设提供了新的发... 详细信息

西藏是我国乃至亚洲和全球最重要生态安全屏障区,生态战略地位显著。但其生态环境相当脆弱,具有不稳定性和敏感性等特点,极易受气候变化和人类活动影响。党的十八大以来,习近平生态文明思想的确立为我国新时代生态文明建设提供了新的发展路径,也为西藏生态文明建设提供了根本遵循、注入了强大动力。文章从建设生态兴文明兴的美丽西藏、促进西藏人与自然和谐共生、推进西藏生态生产双赢促进绿色发展、科学探索西藏“两山”理论的转化路径、全面统筹西藏山水林田湖草沙冰一体化保护、增进西藏各族人民民生福祉、依法依规治理西藏生态环境、构建符合西藏资源禀赋和历史传承的大食物观以及走出一条符合西藏实际的“双碳”之路九个方面探析实现西藏生态文明高地建设的主要路径,为践行习近平生态文明思想,打造地球第三极绿色高地提供理论依据。

关键词：习近平生态文明思想生态环境保护地球第三极生态文明高地西藏

碳排放权交易价格保险产品设计探索——基于“保险+期货”模式

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金融理论与实践 2024年第5期 69-82页

作者：姚定俊张雨朱赛博南京财经大学金融学院江苏南京210023

国际上碳保险产品随着碳交易的兴起而兴起,已有近十年历史。我国碳保险产品目前还处于起步阶段,但前景广阔。借鉴农产品“保险+期货”模式创新碳期货保险产品,以其中4种保险产品为例在蒙特卡洛方法下进行定价及敏感性分析,最后对A企业... 详细信息

国际上碳保险产品随着碳交易的兴起而兴起,已有近十年历史。我国碳保险产品目前还处于起步阶段,但前景广阔。借鉴农产品“保险+期货”模式创新碳期货保险产品,以其中4种保险产品为例在蒙特卡洛方法下进行定价及敏感性分析,最后对A企业进行个案分析。研究发现:保险产品的避险效果明显,其中我国碳交易市场保险费率最低,欧盟碳交易市场保险费率最高。目标价格和市场波动率对4种保险费率影响明显;无风险利率的影响较小;障碍期权“触碰式”敲出价格和价差期权托底赔付价对保险费率影响明显,而封顶结算价影响较小。

关键词：碳保险 “保险+期货” 碳排放费率定价

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