The influence of environmental factors on species composition and distribution in a community forest in Northern Thailand

Understanding the environmental factors that influence tree species composition is essential for successful management of biodiversity and sustainable use of community forest resources.This study aims to assess tree species composition and distribution in the deciduous Ban Mae Chiang Rai Lum Community Forest in Northern Thailand and to analyze the influence of environmental factors on tree biodiversity in the forest.We conducted a stratified systematic sampling of the forest’s total area of 3925 ha,and twenty-five 0.16 ha survey plots were established in three different stands of the deciduous forests to estimate and characterize the difference in biological diversity among the stands.Canonical correspondence analysis(CCA)was used to investigate the environment factors affecting such differences in biodiversity of the stands.The results showed a high diversity of trees in the forest as 197 species,144 genera,and 62 plant families were recorded.The CCA ordination identified the environmental factors—the most important of which were elevation,distance to streams,soil moisture,organic matter,and distance to communities—that signifi-cantly influenced the diversity and distribution of tree species(p<0.05)in the community forest.Our findings indicate that the implementation of drought reduction measures such as building check dams,fire protection,and monitoring community forest-product usage would be recommended to further biodiversity conservation and the sustainable use of community forest resources.

Endogamous marriage and the prevalence of hemoglobin E in ethnic groups of northern Thailand

Objective:To investigate the impact of the endogamous marriage culture on the prevalence of the hemoglobin E(HbE) recessive variant.Methods:The prevalence of the hemoglobin E(HbE)recessive variant was determined by dot-blot hybridization in 4 endogamous villages(1 Mlabri and 3 Htin ethnic groups) in comparison with 9 other nearby non-endogamous populations.Results:Although the overall HbE prevalence in the population studied(8.44%,33/391)was not significantly different from that of the general southeast Asian population,a high prevalence and individuals with homozygous HbE were observed in two villages,the Mlabri from Wiang Sa district and the Htin from Thung Chang district of Nan province(26.3%and26.9%,respectively).The low HbE allelic frequency noticed in some endogamous populations suggests that not only endogamy but also other evolutionary forces,such as founder effect and HbE/β-thalassemia negative selection may have an effect on the distribution of the HbE trait.Conclusion:Our study strongly documents that cultural impact has to be considered in the extensive prevalence studies for genetic disorders in the ethnic groups of northern Thailand.

Differential seed removal,germination and seedling growth as determinants of species suitability for forest restoration by direct seeding–A case study from northern Thailand

Background Direct seeding is potentially a more cost-effective alternative to conventional tree planting for restoring tropical forest ecosystems.However,seed loss,due to removal and damage by animals,can substantially reduce seedling establishment.Therefore,this study examined the impact of seed predation on seedling establishment of five tree species,native to upland evergreen forests of northern Thailand:Hovenia dulcis,Alangium kurzii,Prunus cerasoides,Choerospondias axillaris and Horsfieldia amygdalina.We tested the hypothesis that excluding animals would significantly reduce seed removal,and increase both germination and seedling survival.The objective was to calculate a composite index of the relative suitability of the species studied for direct seeding.Methods Seeds were placed on the ground in a deforested site and subjected to five predator-exclusion treatments:wire cage,insecticide,cage+insecticide,open cage and no exclusion(control).Results Seed loss was highest for H.amygdalina(the largest seed tested).Across species,wire cages significantly reduced seed loss by 12.4%compared with controls(P<0.001)suggesting that vertebrates were the major seed predators.Seed germination ranged from 0 to 77%among the species tested.Based on relative species-performance scores(combining measures of survival and seedling growth),P.cerasoides was the most suitable species for direct seeding,followed by A.kurzii and C.axillaris,whilst H.dulcis and H.amygdalina were unsuitable.H.dulcis had small seeds with low seed germination,whereas H.amygdalina was subjected to high seed removal.Conclusion Exclusion of seed predators and the selection of suitable species may substantially increase the success of direct seeding,as a technique for restoring upland evergreen forest ecosystems.Testing more species for their suitability is needed,to provide more diverse options for forest restoration.

The 2014 Northern Thailand Mw 6.1 Earthquake and its Seismogenic Tectonics

On May 5, 2014, an earthquake with a magnitude of Mw 6.1(the largest earthquake in Thailand so far) occurred in Chiang Rai of the Golden Triangle area in northern Thailand. We had an opportunity to conduct field survey immediately after the earthquake. Serious damage to buildings and casualties of lives were observed, and the estimated Maximum Mercalli Intensity(MMI) of the earthquake is Ⅷ(evaluated according to the MMI scale of the Chinese Standard). No long continuous ground ruptures were produced during the earthquake, but in the epicenter(commonly within MMI Ⅷ extent), massive small linear ruptures(usually several tens of meters long) developed and displayed intriguing structural features, offsetting many roads several centimeters left laterally on NE trending cracks or offsetting right laterally on NW trending ones. The focal mechanism solution of earthquake shows that this is a pure strike-slip event, and two nodal planes in NW and NE directions had the same motion senses respectively as those of breakage associated with the earthquake. The long axis of the isoseismals and aftershock distributions are in NE direction,which is consistent with the strike of Luang Namtha fault. The 230-km-long Luang Namtha fault which starts from the border of China and Laos, runs through northern Laos, and terminates at Chiang Rai of Thailand is predominated by left-lateral strike-slip and active in late Quaternary, and two earthquakes over Ms 6.0 occurred along the fault in 1925 and 2007 respectively. This Mw 6.1 earthquake occurred at the southwestern end of the fault. All related features such as evident structural rupturing, elongated orientation of MMI and aftershock distribution,as well as the location of the epicenter,suggest that the Luang Namtha fault may be responsible for the 2014 Northern Thailand earthquake.

Failure analysis on a heavy rainfall-induced landslide in Huay Khab Mountain in Northern Thailand

On 28 th July 2018,a massive landslide occurred in a mountainous area in Northern Thailand.The landslide after ten days of heavy rainfall generated the movement of uphill mountain soil into the populated village.This study presents a comprehensive failure analysis of local rainfallinduced landslides based on topographical and geological information.Rainfall measurement data were gathered from two rainfall stations close to the study area.The rainfall records show that the total monthly rainfalls in 2018 were significantly higher than the average monthly rainfalls over the past decade.Site investigation started with an unmanned aerial photogrammetric survey to generate a digital elevation model.Then,dynamic probing test,microtremor survey,and electrical resistivity survey were carried out along undisturbed soils beside the failed slope to evaluate the thickness of the soft soil cover on top of the rock basement.During the site survey,residual soil samples were collected to determine engineering properties in the laboratory.Finally,a slope stability analysis was performed to assess the landslide hazard based on the results of aerial photogrammetric survey,field exploration,and laboratory tests.The slope stability analysis and rainfall records revealed that the Huay Khab landslide was mainly caused by an increase in the water content of residual soils due to the prolonged rainfall which led to a sharp decrease in the shear strength.This leads to the conclusion that the proposed landslide investigation program could be used to assess the potential of landslide failure due to prolonged rainfall on a local scale.

Prediction of Dry Dipterocarp Forest Distribution Using Ecological Niche Model in Ping Basin of Northern Thailand

DDF （dry dipterocarp forest） is importantly deciduous forest type in Thailand since it consists of important tree species for timber products and non-timber products. So, people would like to come to use these products for daily uses in this forest type. The main aim of this study is to evaluate significant biophysical factors for DDF distribution using factor analysis and to model DDF distribution using ENFA （ecological niche factor analysis）. In this study, 13 watersheds of Ping Basin in northern Thailand were selected as the study site based on availability of forest inventory data in 2007 from DNP （Department of National Parks, Wildlife and Plant Conservation）. Basic biophysical data for data analysis included forest inventory data （179 DDF plots）, 10 climatic data, three topographic data, and one soil data. For identification and evaluation of biophysical factors for DDF distribution using factor analysis, the first three factors, namely DDF-1, DDF-2 and DDF-3, had been extracted with 95.35% of total variance. These three components were used to predict DDF distribution based on HS （habitat suitability） with ENFA. In practice, the results were validated with AVI （absolute validation index） and CVI （contrast validation index） with validated forest inventory dataset. This evaluation shows that DDF-2 model is the best HS data consisting of four physical factors （mean annually temperature, mean monthly maximum temperature, mean monthly minimum temperature, and elevation）, which is able to effectively used for habitat suitability for DDF distribution prediction. It was found that habitat suitability for DDF distribution can be classified into four classes including high suitable habitat, moderate suitable habitat, low suitable habitat, and unsuitable habitat. As a result, DDF distributions with high suitable habitat are highly related with DDF forest inventory plots of DNP. Thus, the obtained output can be further used for DDF rehabilitation according to climate and topographic factors.

Monitoring Hotspots Using Thermal Sensors on MODIS Aqua/Terra Satellite System: A Case Study of National Park Areas in Northern Thailand

This research presents the remote sensing data on hotspots in four national parks located in Chiang Mai province, Thailand: Sri Lanna National Park, Huai Nam Dang National Park, Doi Pahom Pok National Park, and Doi Inthanon National Park. To mitigate the devastating impacts of these wildfires, effective monitoring and management strategies are necessary. Remote sensing technology provides a promising approach for mapping burnt areas and understanding fire regimes at a regional scale. The primary focus of this research is to employ the MODIS Aqua/Terra satellite system for obtaining historical remote sensing data on hotspots. The advantages of remote sensing include accurate identification and mapping of burnt areas, regular monitoring, rapid data acquisition, and historical data analysis. The MODIS sensor, specifically designed for fire monitoring, offers enhanced fire detection and diagnosis, multiple channels for qualitative and quantitative analysis, and precision positioning capabilities. The research results presented in the analysis contribute to the understanding of fire incidents and hotspot occurrences within the four national parks studied. This paper suggests the optimization of early detection of forest and land fires through the utilization of Artificial Intelligence (AI), presenting it as a recommendation for future endeavors. The research emphasizes the significance of implementing efficient policies and management strategies to effectively tackle the challenges associated with fires in these ecologically significant areas.

Study on the geochemical characteristics of arc-volcanic rocks in the Chiang Rai-Lampang belt of northern Thailand

On the basis of the petrographic characteristics, rock assemblages, petrochemistry, REEs, trace elements and geotectonic settings, the authors described the characteristics of continental marginal arc-volcanic rocks in the Late Permian-Early Triassic (P2-T1) volcanic rocks distributed on the eastern side of the ocean-ridge/oceanic island basalts in the Chiang Mai belt. The volcanic rock assemblage is basaltic andesite-andesite-rhyolite. The volcanic series is dominated by the calc-alkaline series, with the tholeitic series coming next. The chemical composition of the volcanic rocks is characterized by high Al2O3; the REE distribution patterns are of the LREE-enrichment rightward incline type; the large cation elements are highly enriched, and the volcanic rocks are generally enriched in U and Th and depleted in Ti, Cr and P. The petrochemical plot falls within the field of island-arc volcanic rocks, in consistency with the projected points of continental marginal arc-volcanic rocks in the Lancangjiang belt. These continental mar-ginal arc-volcanic rocks, together with ocean-ridge/oceanic island-type volcanic rocks in the Chiang Mai belt, con-stitute the ocean-ridge volcanic rock-arc magmatic rock belts distributed in pairs, indicative of eastward subduction of the oceanic crust in the Chiang Mai belt. This result is of great importance in exploring the evolution of the paleo-Tethys in the Chiang Mai belt.

Geochemical characteristics of island-arc volcanic rocks in the Nan-Nam Pat-Phetchabun zone,northern Thailand

Late Permian-Early Triassic(P2-T1) volcanic rocks distributed on the eastern side of ocean-ridge and oceanic-island basalts in the Nan-Uttaradit zone were analyzed from aspects of petrographic characteristics,rock assemblage,REE,trace elements,geotectonic setting,etc.,indicating that those volcanic rocks possess the characteristic features of island-arc volcanic rocks.The volcanic rock assemblage is basalt-basaltic andesite-andesite.The volcanic rocks are sub-alkaline,dominated by calc-alkaline series,with tholeiite series coming next.The chemical composition of the volcanic rocks is characterized by low TiO2 and K2O and high Al2O3 and Na2O.Their REE patterns are of the flat,weak LREE-enrichment right-inclined type.The trace elements are characterized by the enrichment of large cation elements such as K,Rb and Ba,common enrichment of U and Th,and depletion of Nb,Ta,Zr and Hf.The petrochemical plot falls within the field of volcanic rocks,in consistency with the plot of island-arc volcanic rocks in the Jinsha River zone of China.This island-arc volcanic zone,together with the ocean-ridge/oceanic island type volcanic rocks in the Nan-Uttaradit zone,constitutes the ocean-ridge volcanic rock-island-arc magmatic rock zones which are distributed in pairs,indicating that the oceanic crust of the Nan-Uttaradit zone once was of eastward subduction.This work is of great significance in exploring the evolution of paleo-Tethys in the Nan-Uttaradit zone.

Geochemistry of Middle Triassic Radiolarian Cherts from Northern Thailand:Implication for Depositional Environment

Geochemical analysis reveals that Middle Triassic radiolarian cherts from northern Thailand,including Chiang Dao,Lamphun and Den Chai,are of biogenic origin.These cherts present slightly high SiO2 content which was possibly modified by diagenetic alteration and migration processes as indicated by negative correlation between SiO2 and most of the other major elements.The relatively high content of Cr,Zr,Hf,Rb and Th and high positive correlation of these elements with Al and Ti from the majority of cherts suggest a close relation to terrigenous component.The Ce anomaly（Ce/Ce＊） with geometric means ranging from 0.85 to 0.93 is compatible with that of continental margin composi-tion（0.67-1.52） from Murray et al.（1990） which is also consistent with low Eu anomalies（Eu/Eu＊,0.91-0.94）.Moreover,the slightly low ratios of La and Ce NASC normalized（Lan/Cen,0.91-0.94） and the low LREE and HREE ratios in most of our samples（Lan/Ybn,0.62-0.85） are in agreement with the continental margin.The result from Lan/Cen vs.Al2O3/（Al2O3＋Fe2O3） discrimination diagrams also supports the continental margin（residual basin,s.str.） interpretation.These geochemical results are compatible with geological evidence,which suggest that during the Middle Triassic,radio-larian cherts were deposited within a deeper part of a residual basin in which an accommoda-tion space was possibly controlled by faults un-der extensional regime subsequent to Late Variscan（Permian） orogeny.Paleogeographi-cally,the main Paleotethys which closed during Late Triassic should be located further to the west of these study localities.This scenario is in agreement with the current view of the Tethys in this part of the world.

Biology and control of the fruit borer, Conopomorpha sinensis Bradley on litchi （Litchi chinensis Sonn.） in northern Thailand

Fruit and leaf shoot of litchi （Litchi chinensis） infestation by naturally occurring populations of the fruit bprer, Conopomorpha sinensis larvae and C. sinensis parasitization rates were determined in litchi orchards in northern Thailand at high （ca. 1 400 m ASL） and low （ca. 800 m ASL） elevations with different, non-overlapping fruiting seasons. In addition, spray applications of Bacillus thuringiensis var. aizawai, the natural compound spinosad and the chemical pesticide imidacloprid were conducted in the field to test the effects of these agents on C. sinensis fruit infestation rate. Fruit infestation rate and fruit growth, studied in a low elevation orchard, were sigmoidal and showed a highly significant positive correlation （P ≤ 0.01）. Leaf shoot infestation rate in the low elevation orchard decreased in the course of the fruiting season （March until May）, but increased in the high elevation orchard, where no fruits were present within the same period of time. Together, these results indicate that females of C. sinensis clearly prefer fruits over shoots for oviposition. If no fruits are available, which was the case in the high elevation orchard during that time, they are constrained to lay their eggs on shoots. The parasitization rate of C. sinensis larvae in untreated fruits was 54.3%. The parasitoid species were Chelonus chailini （90.8%） and Phanerotoma sp. （9.2%）. In the leaf shoots, C. sinensis was found to be parasitized by Phanerotoma sp. and Apanteles briareus. The applications of the different active agents had no significant effect on C. sinensis fruit infestation compared to the untreated control. Besides the cryptic life of the larvae, this is most probably explained by the fact that C. sinensis has several generations during the fruiting season. Because of the high parasitization rates recorded, an alternative and more effective control measure than the application of pesticides might be the augmentative release of parasitoids.

Zircon U-Pb Geochronological Evidence for the Evolution of the Nan-Uttaradit Suture in Northern Thailand

The Nan-Uttaradit suture is marked by a narrow N-S trending and discontinuous ophiolite belt in northern Thailand. This suture zone is a mélange composed of gabbro, tholeiitic meta- basalt, andesite and radiolarian chert. Samples of gabbro and meta-basalt in the Nan-Uttaradit suture yield zircon U-Pb ages of 311±10 and 316±3 Ma, respectively, interpreted as the crystallization ages of the rocks, suggesting the Nan-Uttaradit Ocean existed in the Late Carboniferous. Our results indicate that the Nan-Uttaradit Ocean co-existed with the Ailaoshan-Jinshajiang Ocean to the north and was probably an along-strike extension of the latter.

Tourist Industry Promotion： Aim to Introduce Thai Local Foods Matching With Northern Program＇s Tours to Serve Sustainable Tourism

Tourist industry had been promoted and become one of the important strategies of Thai government for socioeconomic development for years and become successful by ranking--Thailand becomes well-known as top ranking to visit from tourists around the world. When people travel, foods are always needed to fulfill human needs and the satisfaction of the travelers. The objectives of the research were to： （1） survey and determine the local food image and identity of Northern region of Thailand to support tourist industry; （2） survey program＇s tourism in Thailand and study the promotion of local food that had added in the programs＇ tours as tourist destination; （3） find out the possibility of local food and culture for promotion in tourist industry of Northern region in Thailand; （4） develop gastronomy tourism＇s routing. The population were the subject persons who are experts in tourist industry, Northern foods restaurant owner, and program＇s tour. Mixed method was used for data collection and analysis. The result of the research is revealed into four parts： Phase 1： （1） Thai Northern region had been divided into two part： upper Northern and lower Northern region. There are eight provinces in upper Northern region： Chingmai, Chingrai, Lampoon, Lampang, Prayao, Phare, Nan, and Mae-Hongsorn. Chingmai was the capital of ＂Lanna territory （1558-1774）＂ rich with culture; （2） Upper Northern local foods related to the legend, have their own characters and are still available to get to eat; （3） Northern local food contained with Northern ingredient and indicated as geographical indications; （4） The lower Northern region related with ＂Sukhothai territory （1157-1370）＂, Sukhothai was the capital. There are six provinces in the region： Sukhothai, U-taradid, Tag, Kampangpet, Pidsanuloak, and Petchaboon. Food of the lower Northern provinces had their own characteristics but some of the dishes were influenced with Chinese cuisine, such as noodles. Phase 2： Most of tour companies had included local food in the tour programs to promote Northern local foods in low level. Phase 3： Life＇s pathway of the Northern people lived related to the three seasons： rainy season, cool season, and summer. Each season had different kinds of vegetables and fruits which influence the menus and foods. Eating foods as medicine also related to the season, such as shallot and garlic had added more in foods in cool season, in order to prevent cold of family＇s members. Northern life style always celebrated in all ceremonies with foods, snack, and sweet, such as： wedding, cremation, and community cerebrations which may be promoted in tour program as their ways of living with sustainable, in order to promote socioeconomic development in the community. Phase 4： The gastronomy tourism was developed into five routings to promote tourist industry in the Northern part of Thailand as the following： （1） gateway to reach ＂Lanna＂; （2）window to visit the Northern part of Thailand; （3） pay respect to the Buddha and visit dynasty heritage; （4） visit the peaceful and tranquilly heritage; and （5） visit Thailand＇s border with boundless. Conclusion： Thai local lifestyle, culture, and local foods in the Northern part of Thailand, contained rich image and identity of history, legend, and human diversity, which are worth and valuable for promoting as tourist industry in the Northern part of Thailand and also conserved job absorption and community development. Therefore the government of Thailand and tour companies ought to promote Thai local foods as value added and tourist industry which also benefit for the sustainable socioeconomic development in long future.

泰国北部云南方言特征词研究

泰国北部的云南方言属于一种跨境语言,但保留了许多从国内流传下来的核心词汇,同时也汇集了泰北华人在不同时期因语言文化接触和创新而产生的特殊词汇。通过对泰北云南方言特征词进行代际、词类、语音、义类的共时分布及传承词、变异、创新等方面的历时考察,证明当地云南人对祖籍方言的认同态度,彰显了海外汉语方言的根,同时反映了语言的变化发展是经过长时间的变异和整合过程完成的。

泰国北部“云南人”语言态度调查研究

泰国北部的“云南人”在长期融入泰国社会过程中形成了多语语言生活。通过调查清莱府皇太后县辉鹏华人村不同语言态度、语言实践,考察泰北云南人对母语云南方言的代际差异。调查结果表明:泰北云南人的云南汉语方言语言态度制约语言使用,云南方言使用及能力保持良好,但云南方言能力在普通话、泰语竞争下呈代际衰减趋势。

泰国北部清莱-南邦带弧火山岩特征研究

从岩相学特征、岩石组合、岩石化学、稀土元素、微量元素、大地构造环境等诸多方面分析清迈带洋脊/洋岛玄武岩的东侧分布的晚二叠世—早三叠世(P2—T1)火山岩认为其具有陆缘弧火山岩特征。火山岩组合为玄武安山岩-安山岩-流纹岩;火山岩系列以钙碱性系列为主,拉斑系列次之;火山岩的化学成分以高Al2O3为特征,稀土模式为轻稀土富集右倾斜型;微量元素大阳离子元素富集,普遍富U,Th亏损Ti,Cr和P;岩石化学投点均落在岛弧火山岩区,与中国澜沧江带陆缘弧火山岩投点相一致。该陆缘弧火山岩带与清迈带的洋脊/洋岛型火山岩构成了成对分布的洋脊火山岩-弧岩浆岩带,指示清迈带洋壳向东俯冲。

RS与GIS支持下的土地利用及植被覆盖变化研究

利用遥感(RS)和地理信息系统(GIS)技术,对泰国北部山区1985～1995年土地利用及植被覆盖变化进行了定量研究,并以Mae Uam子流域为例研究了各类用地的地形分布状况及其变化趋势。结果表明,10年间流域内森林面积减少,而耕地、裸地、草地和城镇建设用地增加且这些变化主要发生在地势较为平坦的地形范围内,在高坡度地区土地利用变化较小。

泰国北部的云南穆斯林——秦和人

“秦和人”一词 ,是泰语对历史上形成并生活在泰国北部清迈、清莱一带祖籍云南的回汉两族侨胞的统称 ,19世纪后 ,被当时旅居东南亚地区的西方殖民官员、探险家和传教士按泰语北部方言拼写成Cin -Ho/Chin -Ho ,或简称为Ho/Haw/Hor,大量进入其日记、札记、信函和旅行报告中。但由于云南回族马帮商人前往泰北的时间最早 ,商贸活动最频繁 ,移居时间最早 ,所占人数最多 ,因此西方文献和今天泰语中惯称的所谓“秦和人” ,又主要专指云南籍回族穆斯林。清迈府县城乡共有 9个秦和穆斯林区 ,阿拉伯语和汉语是他们的主要语言 ,清迈府城的王和街浓缩了云南籍的秦和人移居泰国北部的历史 ,现已成为以云南籍回族穆斯林为主的秦和人在今日泰国社会存在的一种文化象征。

泰国北部山区土壤侵蚀调查报告

[目的]在泰国北部山区开展实地调查,研究该区土壤侵蚀特征,旨在为泛第三极暖湿区的土壤侵蚀预报和水土流失治理提供依据。[方法]以位于北部山区的清莱府为泰国土壤侵蚀典型区域的代表区域,选取18个调查单元(小流域/矩形区),于2018年11月22—29日调查了该区土壤侵蚀的类型与特征、土地利用类型及其空间分布、植被类型及盖度、耕地状况和作物类型、水土保持措施等。[结果]土壤侵蚀主要发生在道路、田地边坡、坡耕地(尤其是新耕种的坡地)和建设用地边坡,部分林下也可见侵蚀沟发育。未经硬化的土路大多存在不同程度的侵蚀,部分道路形成严重的侵蚀沟。坡耕地的侵蚀在新耕种的田块及其边坡处尤为严重,田块内部主要表现为细沟和浅沟侵蚀,以新近种植的菠萝地最为严重。林下土壤侵蚀主要出现在林下裸露的橡胶纯林内,甚至有浅沟和切沟出现。18个调查单元的平均土壤侵蚀模数介于480.9～3 565.3t/(km^2·a)之间,总体平均为1 767.9t/(km^2·a)。该区域土壤侵蚀模数及其空间变异的主控因素是地形因子。[结论]泰国北部山区虽有大面积的森林覆盖,但采用的水土保持措施相对简单,对开垦坡地的不合理利用引起了严重的人为加速侵蚀,加之该区地形复杂,导致土壤侵蚀严重威胁生态安全和粮食安全。同时,该区的土壤侵蚀基础观测资料缺乏,迫切需要加强土壤侵蚀的基础研究和基础数据的采集,提升对该区域土壤侵蚀过程与机理的认识,注重水土保持措施的综合运用,同时加强土壤培肥、污染防治和土壤保育等措施,保障泰国农业的可持续健康发展。

Lactic acid bacteria mediated fermented soybean as a potent nutraceutical candidate

Objective: To study some soybean cultivars commonly used in Northern Thailand that exhibit high nutritional profile and to investigate the changes in bioactive principles and antioxidant capacity of the fermented soy broth that was prepared using the selected soybean cultivar and Lactobacillus paracasei HII02 mediated fermentation process.Methods: The best soybean cultivar was subjected to fermentation, and then analyzed the phytochemical, antioxidant and nutritional changes by high performance liquid chromatography and spectrophotometric analysis.Results: Sor Jor 2 soybean cultivar showed rich nutritional profile and was subjected to fermentation process. Lactobacillus paracasei HII02 mediated fermentation of Sor Jor 2 soybean exhibited stable physical and chemical characteristics. Lactic acid bacteria mediated fermentation also increased the aglycone forms of isoflavone content, exhibited antioxidant capacity and thereby enhanced the quality of the fermented soy broth. It also prevented the growth of coliforms in fermented soybean.Conclusions: The study results suggest that fermented soybean is rich in nutrition and considered to be safe for consumption for the improvement of health and to treat the malnutrition.