Page 4 - การประยุกต์ใช้เทคโนโลยีระบบสารสนเทศภูมิศาสตร์เพื่อการสำรวจทรัพยากรดินในพื้นที่สูงบริเวณลุ่มน้ำสาขา น้ำแม่ต้า (ลุ่มน้ำยม)

ห้องสมุดกรมพัฒนาที่ดิน
ii

Abstract

Database on soil resources especially in the slopping area (>35%) governed by Land

Development Department is limited which insufficient for land use planning and soil and water
conservation. According to database limitation, soil survey and mapping in the slopping area is
to be considered, the objective of this study was to 1) soil surveying and classification and

mapping and 2) application of geopedologic approach with geographic information systems for
topographic analysis and soil survey planning. The Nam Mae Ta sub-watershed (code 0808)
of Yom River watershed was selected in this study which covered approximately 515.98 km
2
(2.15% of whole area of Yom watershed).

The result of soil survey and classification found that there were 50 mapping units

which divided into 48 soil mapping units and 2 miscellaneous units. The 48 soil mapping units
consisted soil series (16 mapping units) and soil variants (32 mapping units) which covered
318,948 rai (98.9% of the whole area).

Considering the relationship between landform, geomorphology, and soil characteristics,
we found that the characteristics and properties of the soil were related to soil forming factors,

especially in relief type and soil parent materials. For instance, we found the shallow soil
deep to weathered rock in area of volcanic mountains, andesite, granite and also the clayey
soil as the moderately deep to weathered rock in the hills of sedimentary rock. In addition,
we found the deep soil was located at high terrace. While, the clayey soil with poor drainage

was found in lower part of terrace.

Our results indicated that the application of advanced technologies with information
system will be useful for soil survey and mapping especially in highland area. Finally, the soil
map and database based on this study can be used for precisely and properly land use
planning and sustainable soil and water management. In addition to allow farmers to produce

economic crops in accordance with the land suitability for increase crop production efficiency,
reduce costs, and help farmers have more income.