Increasing the Efficiency of Detailed Soil Resource Mapping on Transitional Volcanic Landforms Using a Geomorphometric Approach

Abstract

For developing countries, detailed soil resource data and maps are essential in land-use planning. Unfortunately, obtaining detailed soil data for mapping is expensive. Detailed soil studies and mapping in developing countries often use the grid method. In addition to being time-consuming, the grid method needs a lot of sample points and surveyors. Geomorphometry can be a less expensive alternative for detailed soil mapping. Geomorphometry uses computationally measured terrain characteristics to describe other hard-to-measure terrain and soil properties. In our study, landform arrangements and slopes were analyzed together to create a map of soil pH. Bompon watershed, Indonesia, was used as a case study. Soil mapping units with potentially similar soil pH were created based on a classification system of the two geomorphometric parameters. Soil samples were taken from each of the units. The samples' soil pH was measured and compared to the geomorphometric predicted result. Regression tests were performed to see the significance of geomorphometric parameters on soil pH conditions. Regression tests show that the results of p value of the four soil layers are 0.046, 0.019, 0.037, and 0.047, respectively, on a 5% confidence level. According to the test result, landform arrangements and slopes can indicate soil pH conditions in Bompon. Our estimate suggests that our geomorphometric method is cheaper than the grid method by a factor of seven. The ability to use geomorphometric parameters to describe other soil properties could enable a cheap and fast production of detailed soil maps for developing countries.

Analysis of the Dynamics of Water Flow and Suspension Flow Discharge in Volcano Watershed with Settlement Land Use

“…The results showed that the erosion processes were controlled by both physical characteristics of the land, such as the climate, especially the intensity of rain, topography, especially relief, vegetation, soil, and the human activities (Figure 3). Meanwhile, suspension flows derived from erosion in the channel occurred at the mountain watersheds with settlement land use triggered by the accumulation and concentration of streams that experience an increase in flow discharge (Sambodo & Arpornthip, 2021). Based on this study, natural processes following watershed characteristics and anthropogenic activities such as the type of land use in the volcano watershed area can trigger erosion and sources of suspension production that cause soil loss.…”

Sediment Flow Characteristics in The Upper Slope of Volcanic Landscapes With Dryland Agriculture

“…2 was used to generate the total erosion rate in the watershed key area at 1,657.94 ton/ha/yr. This study indicated that high flow rates were able to influence the sediment flow and erosion process in dryland agriculture areas, leading to soil loss (Sambodo & Arpornthip, 2021). The extent to the effect of flow discharge on the sediments is significantly dependent on erosion, particularly the soil erodibility (Morgan, 2005;Hadini et al, 2019).…”

Pemanfaatan Foto Udara UAV Untuk Pemetaan Kerentanan Fisik Rumah Terhadap Longsor di Sub-DAS Bompon

“…Lokasi yang menjadi area studi adalah Sub DAS Bompon di Kabupaten Magelang, Indonesia. Wilayah ini berada di area transisi antara Gunung Sumbing dan Pegunungan Menoreh yang sangat rawan erosi dan longsor (Sambodo & Arpornthip, 2021). Luaran dari penelitian ini adalah tahapan identifikasi indikator dan peta kerentanan fisik rumah terhadap longsor melalui interpretasi foto udara UAV.…”