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Ecoregional variations of aboveground biomass and stand structure in evergreen broadleaved forests

Journal of Forestry Research 2020年第5期31卷 1713-1722页

作者： Tran Van Do Mamoru Yamamoto Osamu Kozan Vo Dai Hai Phung Dinh Trung Nguyen Toan Thang Lai thanh Hai Vu thanh Nam Trieu Thai Hung Hoang Van Thang Tran Duc Manh cao Chi Khiem Vu Tien Lam Nguyen Quang Hung Tran Hoang Quy Pham Quang Tuyen Trinh ngoc Bon Nguyen Thi Thu Phuong Ninh Viet Khuong Nguyen Van Tuan Dang Thi Hai Ha Tran Hai Long Dang Van Thuyet Dang Thinh Trieu Nguyen Van Thinh Tran Anh Hai Duong Quang Trung Nguyen Van Bich Dinh Hai Dang Pham Tien Dung Nguyen Huy Hoang Le Thi Hanh Phan Minh Quang Nguyen Thi Thuy Huong Hoang thanh Son Nguyen thanh Son Nguyen Thi Van Anh Nguyen Thi Hoai Anh Pham Dinh Sam Hoang Thi Nhung Hoang Van thanh Nguyen Huu Thinh Tran Hong Van Ho Trung Luong Bui Kieu Hung Research Institute for Sustainable Humanosphere Kyoto UniversityUjiKyotoJapan Silviculture Research Institute Vietnamese Academy of Forest SciencesNorth Tu LiemHanoiVietnam Center for Southeast Asian Studies Kyoto UniversityKyotoJapan Vietnamese Academy of Forest Sciences North Tu LiemHanoiVietnam Vietnam Administration of Forestry No.2 Ngoc HaBa DinhHanoiVietnam

Biotic and abiotic factors control aboveground biomass(AGB)and the structure of forest *** study analyses the variation of AGB and stand structure of evergreen broadleaved forests among six ecoregions of Vietnam.A data set of 1731-ha plots from 52 locations in undisturbed old-growth forests was *** results indicate that basal area and AGB are closely correlated with annual precipitation,but not with annual temperature,evaporation or hours of *** area and AGB are positively correlated with trees>30 cm *** areas surveyed(52.6%)in these old-growth forests had AGB of 100–200 Mg ha^-1;5.2%had AGB of 400–500 Mg ha^-1,and 0.6%had AGB of>800 Mg ha^-*** percent of the areas surveyed had stand densities of 300–600 ***^-1,and 64%had basal areas of 20–40 m^2 ha^-*** is an important factor influencing the AGB of old-growth,evergreen broadleaved forests in *** causing the loss of large-diameter trees(e.g.,>100 cm DBH)affects AGB but may not seriously affect stand density.

关键词： Aboveground biomass Carbon storage Climatic variables Ecoregion Edaphic variables Oldgrowth forest

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Induction of Anthracnose Disease Resistance on Chili Fruit by Treatment of Oligochitosan—Nanosilica Hybrid Material

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Agricultural Sciences 2017年第10期8卷 1105-1113页

作者： Pham Dinh Dzung Le thanh Hung Le Si ngoc Hoang Dac Hiet Bui Van Le Nguyen Tien Thang Dang Van Phu Nguyen ngoc Duy Nguyen Quoc Hien Research and Development Center for Hi-Tech Agriculture Ho Chi Minh City Vietnam Graduate University of Science and Technology Vietnam Academy of Science and Technology Hanoi Vietnam University of Science Vietnam National University Ho Chi Minh City Vietnam Research and Development Center for Radiation Technology Vietnam Atomic Energy Institute Ho Chi Minh City Vietnam

Oligochitosan (OC) with molecular weight Mw of 5000 g/mol was prepared by gamma Co-60 ray irradiation of chitosan solution. Nanosilica (nSiO2) with the size of 10 - 30 nm was synthesized by calcination of acid treated rice husk. The mixture of 1% OC - 1% nSiO2 was prepared by dispersion of nSiO2 in OC solution. The morphology of nSiO2 in the mixture of OC-nSiO2 was measured from images of transmission electron microscopy (TEM). The effect of foliar application of the mixture of OC-nSiO2 on the induction of resistance against anthracnose disease caused by Colletotrichum gloeosporioides fungus on chili fruits was investigated. Results indicated that foliar application of OC-nSiO2 with the concentration of 60 mg/l - 60 mg/l was found to be as the optimal treatment that reduced the disease severity on chili fruits to 22.2% compared with 90.0% of the control. Thus, OC-nSiO2 hybrid material could be considered as an effective biotic elicitor to prevent anthracnose disease infection for chili fruits. Furthermore, the prepared OC-nSiO2 hybrid material can also be used as an environmentally friendly agrochemical product for sustainable development of agriculture.

关键词： Oligochitosan Nanosilica Chili Fruit Colletotrichum gloeosporioides Anthracnose

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Estimation of Land Use Changes in Tan Rai Bauxite Mine by Multi-Variants Change Vector Analysis (MCVA) on Multi-Temporal Remote Sensing Data

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Journal of Geoscience and Environment Protection 2020年第3期8卷 70-84页

作者： Nguyen thanh Hoan Hoa Thuy Quynh Le Minh Hang Nguyen Manh Ha Hoang Thi Huyen ngoc Dang Xuan Phong Institute of Geography Vietnam Academy of Science and Technology Hanoi Vietnam Graduate University of Science and Technology Vietnam Academy of Science and Technology Hanoi Vietnam Le Quy Don Technical University Hanoi Vietnam

The Tan Rai Bauxite Project, which exploits a large bauxite mine in Lam Dong province, Vietnam has been in operation since 2012. In addition to the economic efficiency of the project, bauxite mining and processing uses a large area arable land and affect the regional environment. Remote sensing technology is increasingly widely used in many purposes in monitoring the changes of environment and resources, including land use change with high accuracy, giving managers more information to monitor the exploitation and use process of land resource. This study used a Change Vector Analysis (CVA) method of analysis on various remote sensing data sources to monitor the process of land exploitation and restoration of the Tan Rai Bauxite project. High-resolution remote sensing images were used as diverse as SPOT-5, VNREDSat-1, Google Earth from 2013 to 2019 to demonstrate the ability of the MCVA method to combine many other types of remote sensing images together. The results of fluctuation analysis were validated by 200 random points in the study area, and the accuracy of result is more than 90%. The results of land use change statistics were also compared with the annual data of Tan Rai Bauxite Factory. From this study, it can be concluded that the MCVA analysis method can quickly detect land use change areas and can combine many different image sources with a high accuracy. In addition, it also provides statistics of mining areas and restored areas, thereby assisting managers in monitoring the operation of the mine.

关键词： Bauxite Tan Rai MCVA Land Use Change Monitoring Multi-Sensors

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Surface Mapping of Resistive Switching CrO_x Thin Films

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Advances in Materials Physics and Chemistry 2016年第3期6卷 21-27页

作者： Kim ngoc Pham Kieu Hanh Thi Ta Lien Thuong Thi Nguyen Vinh cao Tran Bach Thang Phan Faculty of Materials Science University of Science Vietnam National University Ho Chi Minh City Vietnam Faculty of Resources and Environment Thu Dau Mot University Binh Duong City Vietnam Laboratory of Advanced Materials University of Science Vietnam National University Ho Chi Minh City Vietnam

In this work, we investigated resistive switching behavior of CrOx thin films grown by using sputtering technique. Conventional I-V measurements obtained from Ag/CrOx/Pt/Ti/SiO2/Si structures depict the bipolar switching behavior, which is controlled by formation/dissolution processes of Ag conducting filaments through electrochemical redox reaction under external electric field driven. Conductive atomic force microscopy (C-AFM) technique provides the valuable mapping images of existing Ag filaments at low resistance state as well as the characteristics of filament distributions and diameters. This study also reveals that where the higher amplitude of topography is, the easier possibility of forming conducting filament paths is on CrOx surface films.

关键词： Resistive Switching Chromium Oxide C-AFM Surface Mapping Metal Filament

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越中农产品贸易发展对策研究

越中农产品贸易发展对策研究

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作者：高国青（cao Quoc thanh）东北农业大学

学位级别：硕士

中国和越南是农产品贸易伙伴。两国在消费文化方面有许多相似之处。因此,中国一直是越南农产品重要出口国。据越南海关总署公布的资料,在2010-2014年越南出口到中国的农产品份额约占出口农产品的总价值的40%。近年来,两国农产品贸易不... 详细信息

中国和越南是农产品贸易伙伴。两国在消费文化方面有许多相似之处。因此,中国一直是越南农产品重要出口国。据越南海关总署公布的资料,在2010-2014年越南出口到中国的农产品份额约占出口农产品的总价值的40%。近年来,两国农产品贸易不断加深,随之也产生了一些潜在的问题,包括:越南通过非官方渠道或跨境贸易农产品出口到中国的比例占很大比,容易引起两国的纠纷;两国的进出口标准存在差异;两国之间的政治关系变动会影响贸易关系。研究内容具体如下:首先是界定了农产品和农产品国际贸易的概念,运用了绝对优势理论、比较优势理论、要素禀赋理论、新贸易理论、竞争优势理论等农产品国际贸易相关理论;第二是通过介绍越中农业发展现状、中越农产品出口及贸易比较和越南出口到中国的主要农产品分品种贸易等三方面内容来总结越中农产品贸易现状;第三是从政府和企业、农产品质量以及边境贸易等归纳越中农产品贸易存在的问题以及具体分析制约越中农产品贸易的因素;第四是借鉴了菲律宾、泰国、印度等国家在农产品贸易方面的发展经验,在中国与东盟建设自由贸易区的大环境下,越南应该实施农产品贸易的品牌战略以区别于东盟其它国家农产品,另外,通过鼓励高质量的绿色产品和标准化的绿色加工生产,提高农产品在国际贸易领域上的竞争力;第五是结合越中农产品在贸易中存在的问题,从政府和企业、农产品质量以及边境贸易等四个方面给出了使中越农产品贸易良好发展的建议。针对研究结果,得出如下结论:(1)中越农产品贸易的总体发展状态比较好,双边农产品贸易额呈现波动增长的趋势。大米、木薯切片、水果、橡胶等具体农产品都是越南出口中国的优势产品。(2)中越农产品贸易主要存在以下问题:农产品质量方面,越南是因为技术方面的局限性导致种子的培育与生产方式不恰当,最终生产出的农产品在中国市场也不适销。越南生产的农产品标准化程度也较低;中国也存在相似的标准化生产问题,农民为了盈利更注重产量,管理也不够规范到位。农产品企业方面,越南的农产品企业信息搜集能力较弱,难以掌握市场;中国企业的竞争手段往往是以低价打价格战,所以容易引致反倾销的控诉;政府方面,越南政府部门的职责权能混乱,变化调动频繁,部门之间相互推脱责任;中国由于加入世界贸易组织,政府制定的有关贸易的法律法规需要符合世贸组织的规定,这样就需要调整和修改,程序上更加繁琐麻烦。(3)解决上述问题的对策包括:在产品方面,越方应提高农产品培育技术,优化培育与生产方式,生产在中国市场上适销的农产品;提高农产品的标准化程度,按照统一的规格生产农产品;优化设计农产品包装。中方需要提高标准化生产水平,改进农产品生产技术,规范管理和完善农产品的生产流程;在农产品企业的经营上,越方需要提高市场信息搜集的积极性,减少对政府的依赖,增强信息搜集能力,更好地把握市场变动,提高企业管理水平,注重长期的贸易合作,长远发展。中国农产品进出口企业提高食品质量安全意识,消费者权益保护意识、环境保护意识、社会责任意识,树立正面的企业形象,提高企业信誉。合理应用低价战略进入市场,避免引起反倾销控诉;在政府方面,越南政府明确各部门的职责权能,减少由责任不明确导致的贸易效率低下的情况。中国政府要精简贸易法律法规的修改流程。

关键词：越南农产品贸易发展现状制约因素

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Environmental and External Costs of Yali Hydropower Plant and Policy Recommendations in Vietnam

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Journal of Environmental Protection 2020年第4期11卷 344-358页

作者： Nguyen Van Song Vu ngoc Huyen Nguyen Van Hanh Nguyen Xuan Diep Nguyen Xuan Huu Pham thanh Lan Ho ngoc Cuong Do Thi Diep Tran Thi Thu Trang Nguyen Thi Minh Phuong Faculty of Economics and Rural Development (FERD) Vietnam National University of Agriculture (VNUA) Trauquy Gialam Hanoi Vietnam Viet Nam Institute of Energy (IEN) Hanoi Vietnam Thainguyen University of Economics & Business Administration (TNUEBA) Thainguyen Vietnam Vietnamese Academy of Forest Sciences (VAFS) Hanoi Vietnam Vinh University Vinh Vietnam

The purpose of this study is to estimate the monetary value of the main environmental and external costs of Yali Hydropower Plant (YHPP) and to incorporate them into the financial viability indices of the plant, namely its net present value and electricity price. The results were found that if the electricity price is kept at its original level of 5.2 US cents/kWh to cover direct costs only, the net present value of the plant would be reduced to about 27% by incorporating environmental and external costs. Alternatively, the electricity price would have to be increased to 5.68 US cents/kWh in order to cover the full costs of YHPP and to maintain the original net present value. The main policy recommendations are: Government regulations should require that the financial analysis and appraisal of all future electricity sources include the full cost of these schemes, including not only direct costs but also environmental and external costs related to preventing or mitigating the environmental impact caused by them. An appropriate financial mechanism should be established to allocate the revenue from full cost electricity pricing to a fund to cover the environmental protection and compensation costs.

关键词： Environmental and External Costs Hydro-Electricity Electricity Price Yali Hydropower

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固态发酵酶制剂充分释放水产饲料中潜在的营养物质

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饲料广角 2009年第1期 46-48页

作者： Le thanh Huang Tran ngoc Thien Kim Alison Leary 越南Nong Lam大学水产系奥特奇亚太生物技术研究中心

1 前言亚太地区的水产养殖业面临许多挑战．饲料是人们关注的重点之一。饲料原料价格上涨．某些原料供应短缺以及质量降低已导致饲料原料市场的动荡和变化不定：植物蛋白原料已不再是笃定的饲料蛋白来源：生物燃料的乙醇工业与动物养殖... 详细信息

1 前言亚太地区的水产养殖业面临许多挑战．饲料是人们关注的重点之一。饲料原料价格上涨．某些原料供应短缺以及质量降低已导致饲料原料市场的动荡和变化不定：植物蛋白原料已不再是笃定的饲料蛋白来源：生物燃料的乙醇工业与动物养殖业竞争原料．已大大改变了饲料原料的成本结构。寻求可替代的饲料原料．饲料利用最佳化和动物生产最佳化的技术．以及减少营养物质排泄和减少饲料浪费的技术在当今的水产养殖和水产饲料配方中起着越来越重要的作用。

关键词：水产饲料营养物质固态发酵酶制剂水产养殖业饲料原料动物养殖业亚太地区

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Some Results of Quantitative Analysis of Fracture Orientation Distribution along the Segment Tien Yen-Mui Chua of cao Bang-Tien Yen Fault Zone, Quang Ninh Province, Viet Nam

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Journal of Geological Resource and Engineering 2016年第2期4卷 81-88页

作者： Truong thanh Phi Institute of Marine Geology and Geophysics Viet Nam Academy of Science and Technology 18 Hoang Quoc Viet Street Cay GiayDistrict Ha NoL Viet Nam

The results of quantitative analysis of fracture orientation distribution according to the pair of stereonet windows among 05 different survey sites along the segment Tien Yen-Mui Chua, belong to cao Bang-Tien Yen fault zone, Quang Ninh province, Viet Nam showed that, the correlation values are over 0.80 corresponding to 50%, over 0.75 corresponding to 30% and over 0.65 corresponding to 20%. These values are quite consistent with over 60% of the fracture number in the direction of NW-SE. Especially, the compatibility is clearly reflected in the determination of the frequency of fracture measurements within the division intervals of 20 degrees for dip direction and 10 degrees for dip angle at 05 different survey sites.

关键词： Correlation coefficient fracture orientation stcrconet windows dip direction dip angle.

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锦鲤咖啡馆

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现代装饰 2018年第4期 68-75页

作者： An Viet Dung An thanh Nhan Pham ngoc Linh Nguyen Thai Thach 彭佳 Farming Architects

项目旨在建造一个与锦鲤池相结合的咖啡馆空间。建筑共有三层,加上前院,面积约88平方米。业主希望设计师设计一个易于安装和移除的钢结构,此外,从天花板到家具,整个室内空间都由业主提供的回收的木板制作而成。咖啡馆使用了传统的Batran... 详细信息

项目旨在建造一个与锦鲤池相结合的咖啡馆空间。建筑共有三层,加上前院,面积约88平方米。业主希望设计师设计一个易于安装和移除的钢结构,此外,从天花板到家具,整个室内空间都由业主提供的回收的木板制作而成。咖啡馆使用了传统的Batrang双层瓦片作为建筑立面材料,给来客留下独特的第一印象。屋顶则像一层薄膜覆盖整个立面,使其在周围的建筑中显得格外醒目。

关键词：咖啡馆锦鲤建筑立面室内空间薄膜覆盖设计师钢结构天花板

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太滆运河污染源调查与分析

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安徽农学通报 2017年第20期23卷 66-68页

作者： Tran ngoc Binh Tang Van Tai Tang Thi thanh Sang 华中科技大学同济医学院湖北武汉430074 越南荣市医学大学公共卫生学院东南大学土木工程学院江苏南京211189 越南荣市大学

太滆运河是主要入太湖河流之一,在沟通太湖和滆湖方面起到了极为重要的作用。要治理太滆运河,就必须摸清运河周边污染源的存在情况,搞清楚一些主要点源污染的位置及具体污染情况,因此对太滆运河沿岸污染源进行彻底的调查就十分有必要。... 详细信息

太滆运河是主要入太湖河流之一,在沟通太湖和滆湖方面起到了极为重要的作用。要治理太滆运河,就必须摸清运河周边污染源的存在情况,搞清楚一些主要点源污染的位置及具体污染情况,因此对太滆运河沿岸污染源进行彻底的调查就十分有必要。通过调研与观察,该研究总结了太滆运河主要污染来源,包括:工业点源污染,农业源污染及其他污染源,同时分析了污染对坏境生态的潜隐危害。

关键词：太湖流域太滆运河污染源河道水体污染

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