Thai Journal of Forestry 2024-05-30T14:07:29+07:00 Assoc. Prof. Dr.Sapit Diloksumpun Open Journal Systems <p>Thai Journal of Forestry (TJF) ISSN : 2730-2180 (Print) and ISSN : 2822-115X (Online) were established in 1982 under Faculty of Forestry, Kasetsart University, Thailand, and publishes paper concerning on Forestry Research. Of special interest articles are dealing with forest ecology, forest management, forest economic, silvilculture, watershed, biological diversity conservation and morphology and physiology of vegetable and wildlife,etc.To better circulate the research from Thai and International researchers and contributing scientists to a wider audience.All submitted manuscripts have been reviewed by at least two expert reviewers via the double-blinded review system. TJF is published semi-annually (January-June and July-December). </p> Application of SWAT Model for Spatial Runoff Analysis from Land Use Change in Nam Mae Suai Sub-Watershed, Chiang Rai Province 2023-08-17T13:44:03+07:00 Natee Sodchuen Wanchai Arunpraparat Venus Tuankrua <p>The Nam Mae Suai sub-watershed has water resource problems, including flooding and water scarcity every year. Consequently, the amount of water flowing into the Nam Mae Suai Reservoir may fluctuate due to land use changes in the past. Therefore, the Soil and Water Assessment Tool (SWAT) model was applied to assess the mean runoff and to analyze the water balance from the land use change effects from 2013 to 2018. The results showed that the SWAT model was effective in runoff assessment and water balance analysis for the Nam Mae Suai sub-watershed. The results of model calibration gave values for the coefficient of determination (R<sup>2</sup>) of 0.80, the Nash-Sutcliffe efficiency (NSE) of 0.76 and the percentage bias (PBIAS) of -9.2. It was found that between 2013 and 2018, there was a decrease forest area of 2.9 percent, converted to agricultural and residential areas, causing the average annual runoff to decrease by less than 1 percent. So, it can be observed that the amount of runoff during the dry period decreased by approximately 2 percent, especially at the end of the rainy season from October to December, due to decreasing rainfall, and reduction of forest areas into agricultural areas, causing water loss from evapotranspiration to increase by 2 percent. This causes the soil water storage and streamflow to decrease and the water yields also only slightly decreased. It can be concluded that the runoff volume and water balance of Nam Mae Suai sub-watershed slightly decreased from land use changes. (Overall decreased by no more than 2 percent)</p> 2024-05-30T00:00:00+07:00 Copyright (c) 2024 Thai Journal of Forestry Comparison of Physical and Mechanical Properties of Leucaena leucocephala (Lam.) de Wit Wood on Maejo University Phrae Campus 2023-11-23T09:35:30+07:00 Thiti Wanishdilokratn Benjamat Nipitam Kanyarat Samorkam Jirakit Tanpradit <p>The physical and mechanical properties were compared of <em>Leucaena leucocephala </em>(Lam.) de Wit wood from three zones (forest, nearby building, and nearby reservoir) on the Maejo University Phrae Campus to assist in identifying ways to utilize this Invasive plant species. The physical properties of samples investigated were the moisture content and specific gravity, while the mechanical properties were the modulus of rupture (MOR), modulus of elasticity (MOE), compression parallel to grain, compression perpendicular to grain, hardness and shearing stress parallel to grain. The sample from the forest zone had the values for the moisture content of 25.70±1.32% and for the specific gravity of 0.63±0.03, for the MOR of 115.75±4.35 MPa, for the MOE of 10,055.09±27.55 MPa, for compression parallel to grain of 55.93±2.46 MPa, for compression perpendicular to grain of 6.03±0.62 MPa, for hardness of 4,217.30±43.67 N and for shearing stress parallel to grain of 20.82±1.02 MPa.</p> 2024-06-17T00:00:00+07:00 Copyright (c) 2024 Thai Journal of Forestry Recreational Value of Namtok Sam Lan National Park, Saraburi Province 2023-08-23T10:54:22+07:00 Kanchana Khongphetphanao Santi Suksard Apichart Pattaratuma <p>The socio-economic characteristics of tourists visiting Namtok Sam Lan National Park, Saraburi province were investigated and the recreational value was evaluated based on the zonal travel cost and the individual travel cost methods. Data were collected from 400 tourists who traveled to the Namtok Sam Lan National Park during January–April 2022. The descriptive statistics were applied including the frequency, percentage, minimum and maximum numbers in each tourist group, in conjunction with stepwise multiple regression analysis at the 0.05 significance level.</p> <p> The results showed that the average age of the tourists was 40.42 years and the majority were female (51.25%). Most tourists were at the educational level of a bachelor’s degree (63.75%). The main tourist occupation was private company/employee (37.00%) with the average salary for the respondents being 36,030.13 baht/month. Most visitors were first-time tourists (59.25%), while 87.75% came for recreational purposes. Furthermore, 72.00 % of the tourists traveled with their families, with the average number of people per group being 3. Most of the respondents (96.50%) traveled using personal vehicles and 94.75% intended to come back to the park again. The recreational value of the park based on the zonal travel cost method was 16,119,850.05 baht/year. Overall, the number of tourists visiting was related to their trip expense with the total individual travel cost was 33,624,910.30 baht/year. The other factors relating the number of tourists to the national park were travel distance and age of tourists.</p> <p> </p> 2024-06-18T00:00:00+07:00 Copyright (c) 2024 Thai Journal of Forestry