Xieng Khouang Province Research Articles

A Study on Lao Phuan Vernacular House in Ngan Area, Khoun District, Xieng Khuang Province

The study on vernacular houses of the Lao Phuan ethnic group aims to determine the area that still retains most of its original form, as defined by the fieldwork of Ngan area in Khoun District, Xieng Khouang Province as a case study. The selected area is the only one that still has a large number of traditional houses left behind. Through the study of relevant documents, physical surveys with maps and observations, random measurements of house components, and in-depth interviews with village chiefs, the elderly, and residents in the village: These Lao Phuan vernacular houses are designed and built to meet the needs of their occupations and to suit the nature or environment of the area in which they reside. Including their traditions, culture, and way of living. This can be seen from using materials that are easy to find, durable in use, and abundant locally, such as using Longleng wood as a roofing material. In addition, to being a natural sense, it is also an extra sun and rain-resistant material, making it usable for decades. At the same time, the style of the house has long eaves with small windows, which is due to the fact that the area is located in an area with high rainfall. In addition, the stilt house form will be used as a storage area for daily production equipment, firewood, fishing tools, and weaving equipment, as well as for survival and safety conditions. The use of space inside the house, in addition to allocating the area to serve a basic living, also allocated a large hall area to accommodate guests or relatives who visit regularly. Especially when there are traditional events held in the village or gift ceremonies inside the house. Another important point is that the area has to adapt to the dry season (winter). Therefore, two fireplaces have been set up; the first is in the cooking area. The second point is in the living area to use the fireplace to keep warm, the process of building a house still follows the strict traditions and beliefs that have been practiced for a long time.

Important Insect Pests on Cabbage in Lao PDR

This study was conducted in Xiengkhouang province, Vientiane province, Saravane province, Champasak province, Vientiane Capital, and Plant Protection Center, from January to March 2017. The aims of study were to investigate to major insect pests on cabbage and compared the efficacy of Jeevatu, Jeevatu+botanical pesticide and chemical pesticide to control Diamondback moth in laboratory condition. The study was divided into two treatments: 1) survey important insect pests of cabbage in 3 purposive sampling areas (field)/village, 10 points/rai, and 3 cabbages/point to identify insect pests and survey the life cycle of Diamondback moth of cabbage, and 2) conduct the efficacy experiment of Jeevatu, Jeevatu+botanical pesticide and chemical pesticide to Diamondback moth in laboratory. The experiment was done by Completely Randomized Design (CRD) with 5 treatments and 4 replications. The survey showed that there are 8 species of insect pests on cabbage and the most important species is Diamondback moth (Plutella xylostella) which was found in all provinces that had been survey than followed by striped flea beetle (Phyllotreta striolata), cabbage aphid (Brevicoryne brassicae), cabbage butterfly (Pieris rapae), taro caterpillar (Spodoptera litura), cabbage webworm (Hellula undalis), cabbage looper (Trichoplasia ni) and flea beetle (phyllotreta cruciferae). Life cycle of Diamondback moth was investigated in that laboratory, and it showed that the total of life cycle took about 14-21 days that included 3-5 days for egg stage, 8-12 days for lavae stage, 3-4 days for pupae stage, and 13-31 days of bebeing mature. The efficacy of Jeevatu+Sugar apple leaf extracts, Jeevatu+Neem extracts, and Jeevatu with water for control Diamondback moth indicated that after 5 days sprayed, the mortality percentage was up to 90%, 80% and 57% respectively. For chemical sprayed for 2 days, the mortality percentage was up to 100%. The results of this study showed that the Jeevatu+botanical pesticide can be used as a substitute for substituting chemical in preventing the control Diamondback moth.

How to measure agroecology? A rapid appraisal approach based on focus group discussions

ABSTRACT This study presents an approach to assess agroecology at village level through focus group discussions with village committees and district extension agents. This approach is intended as an alternative to resources-intensive assessment methods, covering larger areas and providing rapid yet empirical evidences for policy and practice. It is based on the translation of the 13 agroecology principles of the High-Level Panel of Experts (HLPE) into 21 contextualized indicators and questions that are relevant for the research area. They are grouped into four entry points for transformative action: land use and governance, farm management, social interactions, and socio-economic situation. This approach was tested in 16 villages and three districts in Xiengkhouang Province in Laos. The results show that villages are at an intermediate agroecological level. Comparable results and conclusions were achieved, regarding potential entry points for transformative action in specific villages, encouraging the reliability of the approach. It also showed to be promising in terms of the capacity to characterize the status of the 13 principles of agroecology, and to capture their changes in time. This approach may be further combined with other assessment methods to complement the aspects that require finer understanding or assessment over large territories.

Impact evaluation of a cash-plus programme for children with disabilities in the Xiengkhouang Province in Lao PDR: study protocol for a non-randomised controlled trial

IntroductionMore than 170 countries have implemented disability-targeted social protection programmes, although few have been rigorously evaluated. Consequently, a non-randomised controlled trial is being conducted of a pilot ‘cash-plus’ programme implemented...

The Long-Term Causal Effect of U.S. Bombing Missions on Economic Development: Evidence from the Ho Chi Minh Trail and Xieng Khouang Province in Lao P.D.R

The Long-Term Causal Effect of U.S. Bombing Missions on Economic Development: Evidence from the Ho Chi Minh Trail and Xieng Khouang Province in Lao P.D.R

The Use of Remote Sensing Technology in Geological Investigation and Mineral Detection in Ban Vang area, Kham District, Xieng Khoang Province, Laos

Ban Vang area, Kham District, Xieng Khouang province, Laos is interested by many geologists. Remote sensing analytical results have identified some prospective mineral areas. One of them is the Ban Vang area. On that basis, Indochina Mining Joint Venture Company (IMC) cooperated with the Northwest Geological Division (Ministry of Natural Resources and Environment of Vietnam) to conduct mineral exploration in the Ban Vang area. The research results suggest that the Ban Vang area, Kham District, Xieng Khouang province, Laos has 2 iron ore bodies, 3 copper ore bodies, and potential ore outcrops. The Fe content of the iron orebodies varied from 28.5% to 58.7%. The ore-bearing rocks and the adjoining rocks are gray skarns having a solid structure with the main mineral composition of pyroxene and garnet. The copper content of the copper orebodies ranged from 0.14% to 5.59%. Copper ore bodies’ bedding is inclined to the west with a dip angle from 55o to 85o and thickness from 0.7m to 20.59m. The ore-bearing rocks and adjoining rocks are gray metamorphic rocks (skarn) with massive structure, granule, panidiomorphic, and grain textures. The mineral composition is mainly garnet and pyroxene. This article introduces remote sensing applications of mineral search in the Ban Vang area. The mineral search was conducted by the Northwest Geological Division. In this project, the author is a supervisor of the IMC Company.

Crop-livestock integration provides opportunities to mitigate environmental trade-offs in transitioning smallholder agricultural systems of the Greater Mekong Subregion

CONTEXTThe Greater Mekong Subregion has been undergoing rapid agricultural transformation over the last decades, as traditional diverse subsistence-oriented agriculture is evolving towards intensified commercial production systems. Negative environmental impacts often include deforestation, nutrient pollution, and greenhouse gas (GHG) emissions. OBJECTIVEThis study aims to explore the potential of crop-livestock integration to mitigate trade-offs between economic and environmental impacts of smallholder farming systems at different stages of agricultural transition and degrees of agricultural diversity across the Greater Mekong Subregion. METHODSWe chose a ‘middle ground’ between detailed modeling of few, representative farming systems and modeling of large household populations. 24 low and high diversity farms were selected in Laos (Xieng Khouang province), Cambodia (Ratanakiri province) and Vietnam (Central Highlands) from a survey dataset of 1300 households. These farming systems were simulated with the whole-farm bio-economic and multi-objective optimization model FarmDESIGN, calculating operating profit, GHG emissions and nitrogen (N) balance. Two optimizations (‘business as usual’ vs. ‘crop-livestock integration’) were performed, generating ‘solution spaces’ or alternative configurations aiming to maximize profitability, keep farm N balanced and minimize GHG emissions. RESULTS AND CONCLUSIONSAgricultural systems across the sites differed in their production orientation and management practices, representing various stages of agricultural transition. Nitrogen balances varied between sites, being negative in Ratanakiri (average − 20.5 kg N ha−1 y−1) and Xieng Khouang (−36.5 kg N ha−1 y−1) and positive in the Central Highlands (73 kg N ha−1 y−1). Negative balances point to unsustainable mining of nutrients due to sale of cash crops without sufficient inputs, and positive balances to the risk of environmental contamination. Total GHG emissions ranged from 0.52–8.12 t CO2e ha−1 and were not significantly impacted by stage of agricultural transformation or agricultural diversity. GHG sources in Ratanakiri and Xieng Khouang were determined by crop residue burning while in Central Highlands fertilizer and livestock were main emitters. High diversity farms obtained higher operating profits (10,379 USD y−1) than low diversity farms (4584 USD y−1). Crop-livestock integration, a combination of measures including introduction of improved forages grasses, manure recycling and residue feeding, and reduction of residue burning, resulted in larger ‘solution spaces’, thus providing farmers with more options to mitigate agro-environmental trade-offs. SIGNIFICANCEThese findings underline the potential of crop-livestock integration to support sustainable intensification pathways in the Greater Mekong region. Public and private investment in further research and extension is needed to develop and scale context-specific crop-livestock integration practices.

Impacts of Unexploded Ordnance Clearance on Wet Rice Farming in Xieng Khouang Province, Northern Laos

Impacts of Unexploded Ordnance Clearance on Wet Rice Farming in Xieng Khouang Province, Northern Laos

The long-term causal effect of U.S. bombing missions on economic development: Evidence from the Ho Chi Minh Trail and Xieng Khouang Province in Lao P.D.R

This study investigates the long-term causal effects of U.S. bombing missions during the Vietnam War on later economic development in Laos. Following an instrumental variables approach, we use the distance between the centroid of village-level administrative boundaries and heavily bombed targets, namely, the Ho Chi Minh Trail in southern Laos and Xieng Khouang Province in northern Laos, as an instrument for the intensity of U.S. bombing missions. We use three datasets of mean nighttime light intensity (1992, 2005, and 2013) and two datasets of population density (1990 and 2005) as outcome variables. The estimation results show no robust long-term effects of U.S. bombing missions on economic development in southern Laos but show negative effects in northern Laos, even 40 years after the war. We also found that the results do not necessarily support the conditional convergence hypothesis within a given country, although this result could be unique to Laos.

Jars of the jungle: A report on newly discovered and documented megalithic jar sites in Lao People’s Democratic Republic

Xieng Khouang and neighboring provinces in Central Laos are home to a vast megalithic landscape featuring large stone jars, discs, and imported boulders located in elevated positions. Sites were first noted in the late nineteenth century, with systematic recording commencing in the 1930s. Despite subsequent survey efforts and more recent excavations, many previously noted sites remain unconfirmed and others undiscovered, limiting our understanding of the geographic extent of the jar sites and the culture that created the jars. Here we present the results of a 2019 survey across Xieng Khouang Province which led to the documentation of 15 previously unreported megalithic sites and one potential habitation site. With the inclusion of the survey data, the Lao PDR Government database of jar sites will grow from 83 to 102, with 94 of the sites now geo-located.

Hepatitis A Virus in Lao People's Democratic Republic: Seroprevalence and Risk Factors.

Despite several recent reports of outbreaks of hepatitis A, little is known about the disease burden in Lao People's Democratic Republic (PDR). We conducted a cross-sectional age-stratified seroprevalence study of anti-hepatitis A virus (HAV) IgG and risk factors in a rural province (Xiengkhouang) and Vientiane capital in Lao PDR. Overall, 62% of participants were anti-HAV positive in Xiengkhouang Province compared with 45.5% in Vientiane capital. In Xiengkhouang, 23.7% of 5- to 10-year-olds were already seropositive compared with 5% in Vientiane. A dramatic increase in seroprevalence occurred between 15- to 20-year and 21- to 30-year age-groups (35.7-62.4%, Xiengkhouang, and 11.5-69.7%, Vientiane) until essentially all older adults were positive in both locations. The main risk factors for HAV antibodies were age, non-Lao-Tai ethnicity, and food-related risk factors. In conclusion, Lao children seem to be exposed very early to HAV, particularly in rural settings, and exposure continues throughout their lives, mostly without being reported. In the older birth cohorts, the high seroprevalence may largely reflect poor sanitation and exposure during childhood. In Vientiane capital, the lower seroprevalence at young ages may reflect better water sanitation since the late 1990s. A comparison with neighboring Thailand indicates that the impact of improved sanitation in Lao PDR began only two decades later. Further improvements in water sanitation, in particular in the rural districts, and better food hygiene are warranted. Our study also suggests that HAV infections are underreported. Improved reporting would provide guidance for targeted interventions to further reduce HAV infections.

Excavating among the megaliths: recent research at the ‘Plain of Jars’ site 1 in Laos

Abstract

Seroprevalence and risk factors of hepatitis E among women of childbearing age in the Xieng Khouang province (Lao People's Democratic Republic), a cross-sectional survey.

Endemic hepatitis E in Southeast Asia increases the risk of death in pregnant women. In Lao People's Democratic Republic, infection with hepatitis E virus (HEV) is widespread in pig farms. No human data are available yet. This study determined the prevalence and risk factors for HEV infection among women of reproductive age living in urban and rural areas. A cross-sectional study was conducted in Xieng Khouang province, selected for its high prevalence of HEV in pig farms, after a two-stage random sampling. Blood eluates of filter paper samples were tested by enzyme-linked immunosorbent assay for anti-HEV immunoglobulin G (IgG). Risk factors were investigated by bivariate and multivariate analyses. Of 226 women (112 rural and 114 urban), anti-HEV IgG was detected in 66 (29.2%), with more in rural than in urban areas (38.4% vs 20.2%; p=0.005). Age (25-29 y) and farming profession were associated with HEV positivity. Living in an urban area, a supply of clean drinking water and raw duck blood consumption were protective. Risks of HEV infection are more related to lack of drinking water resources than to promiscuity with pigs. Women of childbearing age could be targeted by future vaccination programs. Consumption of drinking water should be recommended during pregnancy.

Mining governance dilemma and impacts: A case of gold mining in Phu-Hae, Lao PDR

This paper reexamines how local governments exercised the legal powers related to their official rights and duties to manage the impacts of both large-scale mining (LSM) and artisanal small-scale mining (ASM) activities, and how local households perceived resource changes and what strategies they have adopted to adapt their livelihoods based on a case study of the Phu-Hae area, in Xieng Khouang province of northern Lao PDR. It reveals that local government agencies have insufficient capacity to exercise their legal powers to protect natural resources and local livelihoods, partly as a result of weak governance mechanisms. The impacts from LSM and ASM had degraded natural resources and changed local livelihood strategies, impacting particularly the poorer households and women who perceived ASM as a means to increase income and sustain precarious livelihoods, which was often as the expense of the environment and their health. It highlights the need to strengthen capacity to local government and technical training targeted at farming and non-farming livelihood activities for the local community as a way of facilitating alternative income sources for poor households involved with artisanal mining.

Maize Cannot Be Grown in Xiengkhouang Province?

During a 2005 visit with National Agricultural and Forestry Institute (NAFRI) Director, Dr. Kouang Doungsila issued a challenge to these authors to determine if it was true that crops could not be grown in the extensive uplands of Xiengkhouang Province, Laos PDR. In response, a two-phase series of experiments was proposed and implemented. The Phase I experiment was to bring soil from the Xiengkhouang province uplands to a NAFRI greenhouse near Vientiane to assess possible nutrient requirements using a nutrient omission experiment. Simultaneously, soils were collected and analyzed from seven recognized agricultural regions of Laos. The initial Vientiane greenhouse experiment indicated that maize did grow, but there were multiple issues of extreme soil acidity and clear deficiencies of phosphorus and other nutrients. Phase II of the study included field studies on the site of soil selected for the greenhouse study. Field experiments were carried out for two years at the site with yields of maize exceeding 5500 kg⋅ha−1 in the first year and exceeding 6250 kg⋅ha−1 in a subsequent year. Intense symptoms of nutrient zinc (Zn) deficiency were observed, however. In 2008 another experiment was designed and carried out that included a Zn variable. The results from that experiment confirmed that maize yields nearing 6000 kg⋅ha−1 were indeed possible. Substantial amounts of lime were needed to correct the strong soil acidity, and a series of other nutrients including N, P, K, and Zn were also required. Ongoing issues are where to obtain the extensive amounts of limestone needed as well as an evaluation of the residual effect of the limestone The finely ground, very reactive burnt lime residual effect was, as expected, short-lived. The results clearly demonstrated that, indeed, it was possible for maize to be produced in the extensive uplands of Xiengkhouang province, in answer to Director Khouang’s challenging question.

A new variety of the mycoheterotrophic orchid Lecanorchis thalassica from Xieng Khouang Province, Laos

A new variety of the mycoheterotrophic orchid Lecanorchis thalassica from Xieng Khouang Province, Laos

The Legacy of the Vietnam War: Making a Living amid Unexploded Ordnance in Xieng Khouang Province, Northern Laos

ABSTRACTLaos was drawn into the Second Indochina War, making the country the most heavily bombed country on earth. Although the war ended more than four decades ago, unexploded ordnance (UXO) continues to kill and injure civilians. In many provinces UXO constitutes the major hindrance to socioeconomic development and obstacle to local people earning a decent living. The aim of this article is to examine the ways in which local people have developed livelihood strategies to survive in dangerous environments through the lens of sustainable livelihood perspectives. This article argues that livelihood improvements in Xieng Khouang Province should be characterised as a bottom-up phenomenon. UXO is still a major concern for the government and local people with respect to achieving development objectives. As the financial resources for UXO clearance are limited, education is a powerful tool for creating awareness of UXO risks among local people. The research suggests that more resources should be mobilised to deal with UXO problems.

Efficacy of Expired Foot-and-mouth Disease O Type Vaccines in Cattle and Buffalo in Lao People’s Democratic Republic

Lao People's Democratic Republic (Lao PDR) submitted a request to Japan for 200,000 doses of expired foot-and-mouth disease (FMD) O type vaccines that were in storage for emergency use. Approximately 100,000 animals, consisting of both cattle and Asian water buffalo (Bubalus bubalus bubalis), received the same vaccine twice within one month in Xieng Khouang province in the northeast area of Lao PDR. Concurrently, the efficacy of three-month expired FMD O type vaccine (6PD50 O Manisa) was assessed in serum samples of 90 cattle and 31 buffalo from the field using a Liquid Phase Blocking-ELISA (LPBE) assay. Of these samples, 75 cattle (83.3%) and 24 buffalo (77.4%) were seropositive against the FMD virus (FMDV) O type before vaccination. Testing for non-structural protein (NSP) using the PrioCHECK FMD NS kit showed that many of the animals with high titers in the screening test before vaccination were FMDV-infected animals. Fifteen cattle and seven buffalo with titers 1:32 or under before vaccination exhibited high titers of antibody (1:45-1:1448) one month after the first vaccination and further increased titers (1:362-1:5792) one month after the second vaccination. Nearly all of the cattle (97.6%) had high titers to control FMD 14 months after the second vaccination. To date, no outbreak of FMD has been reported at the study site. Three-month expired FMD O type vaccines induced appropriate immune responses against FMD in both cattle and buffalo.

Intestinal Helminths Recovered from Humans in Xieng Khouang Province, Lao PDR with a Particular Note on Haplorchis pumilio Infection.

A survey of intestinal helminths was undertaken in riparian people in Xieng Khouang Province, Lao PDR. Fecal specimens were collected from 643 people (289 males and 354 females) residing in 4 districts (Nonghet, Kham, Phoukout, and Pek) and were examined by the Kato-Katz technique. The overall helminth egg positive rate was 41.2%, and hookworms revealed the highest prevalence (32.7%) followed by Trichuris trichiura (7.3%) and Ascaris lumbricoides (5.6%). The positive rate for small trematode eggs (STE), which may include Opisthorchis viverrini, heterophyids, and lecithodendriids, was 4.4%. For recovery of adult helminths, 12 STE or nematode/cestode egg-positive people were treated with 40 mg/kg praziquantel and 15 mg/kg pyrantel pamoate, and then purged. Mixed infections with 2 Haplorchis species (H. pumilio and H. taichui), Centrocestus formosanus, Opisthorchis viverrini, a species of cestode (Taenia saginata), and several species of nematodes including hookworms and Enterobius vermicularis were detected. The worm load for trematodes was the highest for H. pumilio with an average of 283.5 specimens per infected person followed by C. formosanus, H. taichui, and O. viverrini. The worm load for nematodes was the highest for hookworms (21.5/infected case) followed by E. vermicularis (3.2/infected case). The results revealed that the surveyed areas of Xieng Khouang Province, Lao PDR are endemic areas of various species of intestinal helminths. The STE found in the surveyed population were verified to be those of heterophyids, particularly H. pumilio.

Current Status of Human Taeniasis in Lao People's Democratic Republic

Human taeniasis was investigated in Lao People's Democratic Republic (Lao PDR) between 2000 and 2011 as part of the nation's helminthiasis survey. A total of 55,038 inhabitants, including 29,846 school children, were examined using the Kato-Katz and scotch-tape anal swab method, and morphological observation of adult worms. Molecular identification of Taenia tapeworms was performed by multiplex PCR or DNA sequence analysis of the mitochondrial cox1 gene. Taenia eggs were present at a rate of 1.5% (845/55,038) in the subject population. Adult tapeworms were identified as T. solium or T. saginata by analyzing the collectable stool specimens (n=126). Three specimens identified as T. solium were found in Luang Prabang, while the remaining 123 specimens, which were T. saginata, were found in Bokeo, Bolikhamxay, Champasak, Houaphan, Khammouane, Luang Namta, Luang Prabang, Oudomxay, Phongsaly, Saysomboune, Saravane, Savannakhet, Xayaboury, Xekong, Xieng Khouang Province, and Vientiane Municipality.