การจำแนกปัจจัยเฉพาะในการปลูกหญ้าแฝกในประเทศไทย

บทคัดย่อ

This study aims to identify niche factors to use in mapping potential areas of vetiver grass planting in Thailand. Pak Chong district of Nakhon Ratchasima province is selected as a case study. There were 4 used datasets: existing planted vetiver data, 3 topographical data (DEM, slope, and aspect), bioclimatic data, and the modified soil data. These datasets were transformed into GIS data with WGS 1984 and Zone 48N and were processed by ecological niche factor analysis (ENFA) in BIOMAPPER. ENFA produced the habitat suitability (HS) index for planting vetiver grass and provided understanding of spatial dispersion ability and tolerance of vetiver grass ecology to the current environment. The analyzed results showed that HS-based ENM2 has the highest possibility for planting vetiver grass, with AVI 0.93 and CVI 0.07. The ENM2 included 97% marginality (the ability for spatial distribution in the study area) and 3% specialization (durability in the study area). Moreover, this ENM2 explicitly indicates the existing vetiver grasses have more highly spatial distribution than durability in the study area with niche factors such as BIO1: the mean annual temperature (25-31°C), BIO5: mean monthly maximum temperature (30-38°C), BIO6: mean monthly minimum temperature (17-27°C) and elevation (600-1,300 m), respectively. The obtained niche factor (e.g., BIO1, BIO5, BIO6, and elevation) will be implemented to map potential areas of vetiver grass in the Center for Promoting the Utilization of Vetiver Grass under the Royal Initiative Project (CPUVGRIP) of Forest Royal Department (FRD) in Nakhon Ratchasima, Thailand further.