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작부체계를 고려한 새만금유역의 토양유실량 추정

Estimating Soil Losses from Saemangeum Watershedbased on Cropping Systems

조영경|김학관|박승우|이은정
한국농공학회 (The Korean Society Of Agricultural Engineers)|2006.11|한국농공학회논문집 (Journal of the Korean Society of Agricultural Engineers)|제48권 제6호|pp. 101-112

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참고문헌

주제분류농학

초록

본 연구에서는 작부체계를 고려하여 새만금유역의 토양유실량을 추정하였다. GIS와 범용토양유실량식(USLE)을 사용하여 유역규모의 토양유실량을 추정하였으며, 연구결과를 요약하면 다음과 같다.1) USLE에 사용되는 인자들은 1:25,000 축척의 국립지리원의 수치지도와 농촌진흥청의 정밀토양도, 환경부의 중분류토지피복지도 등의 자료를 GIS을 활용하여 구축하였다.2) USLE 인자 중 밭토양의 C 값은 밭작물과 관련된 통계자료를 이용하여 산출한 작목별 재배면적과 기존 연구된 작부체계별 C 값을 이용하여 새만금유역 내 행정구역별(시군단위) 값을 산출하였다. 새만금유역의 밭토양의 C 값은 0.28 0.35의 분포를 나타내었으며, 김제시(0.35)에서 가장 높았으며 완주군(0.28)에서 가장 낮은 것으로 나타났다.3) 새만금유역에서 발생하는 연평균 토양유실량은 2,852 천t로 추정되었다. 토지이용별 단위면적당 연평균 토양유실량은 논 0.8 t/ha, 밭 33.7 t/ha, 산림 1.1 t/ha, 초지 3.7 t/ha, 나지 299.0 t/ha, 시가지 1.4 t/ha로 분석되어, 밭과 나지로부터의 토양유실이 큰 값을 보였다.SubwatershedArea(km2)Soil lossSubwatershedArea(km2)Soil loss(103 t)(t/ha)(103 t)(t/ha)M.G.0.a)M-01105.9140.613.28D.J.D-01101.790.28.87M-0268.672.910.62D-02117.4121.610.35M-03110.5214.919.44D-03215.9223.510.35M-04157.9405.325.67D-04136.7124.89.13M-0573.487.611.94D-05116.399.48.55M-0660.275.212.49D-06265.0159.06.00M-0760.1102.917.13D-07108.922.02.02M-0890.8164.318.10D-0899.727.62.76M-0976.292.012.06Sub-total1,161.6868.07.47M-1077.745.85.90

Abstract

A Geographic Information System (GIS) was developed to estimate basin-wide soil losses using the Universal Soil Loss Equation (USLE). It was applied to estimate the annual average soil losses from the Saemangeum watershed. The USLE factors for each subarea of uniform land use and treatments were estimated from the GIS routines from digital topographic maps, land cover and detailed soil maps. A routine was developed to estimate the averaged cropping management factors (C) of USLE for multi-cropping farmlands, based on cropping system records from the district offices. The resulting C factors ranged from 0.28 to 0.35 for multi-cropping areas.The estimated annual average soil loss was approximately 2.9 million tonnes. Typical soil losses from different land uses were 0.8 t/ha at paddies, 33.7 t/ha at uplands and 1.1 t/ha from forested mountains. It was also found that 6.0% of the arable land of the watershed possessed high risks of soil losses, and conservation measures were needed to reduce soil losses.

참고문헌 (25)

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