Soil erosion assessment of Pagsanjan sub-watershed by Rusle model using GIS techniques

Date

6-2022

Degree

Bachelor of Science in Agriculture

Major Course

Major in Soil Science

College

College of Agriculture and Food Science (CAFS)

Adviser/Committee Chair

Victorina A. Bato

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Abstract

Soil erosion is a global phenomenon that affects both developed and developing countries. In humid tropics like the Philippines, soil erosion by water is mostly observed due to high rainfall events. Pagsanjan River Basin is second to the biggest river basins that contribute freshwater inflow of about 35% to Laguna Lake. In this study, the soil erosion assessment of Pagsanjan sub-watershed was done using RUSLE model in IDRISI Selva 17.0 Software. Geographic information system was utilized to process all geospatial data. GloREDa rainfall erosivity gridded data was used, as an improvement over the absence of research-based rainfall erosivity data covering Pagsanjan sub-watershed and the Philippines. Based on the results, the study area is classified under moderate soil erosion class with an average soil loss of 140.7 ton-ha-1 yr-1. Barangay Ibaba Del Norte and municipality of Paete were predicted to have the highest mean annual soil losses of 8,515.3 ton-ha-1 yr-1 and 10,683.0 ton-ha-1 yr-1, respectively, and are classified under very high soil erosion class. The presence of high rainfall erosivity has most likely to contribute to high amounts of soil loss in the area. Another reason is the moderate to high soil erodibility properties of the soils present, as well as high topographic features of Pagsanjan sub-watershed. Moreover, the land uses/land covers (LULC) present have influenced the variations in the erosion rates.

Language

English

LC Subject

Soil erosion--Geographic information systems--Philippines, Soil erosion prediction--Philippines, Universal soil loss equation, Watersheds--Philippines, Agriculture, Soil Science Agricultural Systems Institute

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 993.5 2022 A3 P37

Document Type

Thesis

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