변곡점을 이용한 영농형태별 토양 인산 유출 잠재력 평가
Evaluation of Phosphorus Release Potential in Arable land with Different Landuse by Phosphorus Threshold
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초록
우리나라 농경지 이용형태에 따라서 인산유출 잠재력과합리적인 농경지 인산관리 기준을 설정하기 위해서 경남 통영시, 창녕시 및 진주시의 논, 밭, 시설재배지 토양을 각각100, 100, 75 곳에서 채취하여 인산유출 변곡점을 분석하였다. 조사지역의 논, 밭, 시설재배지의 평균 유효인산 함량은각각 86, 619, 796 mg P2O5/kg로 농경지 이용형태에 따라토양의 인산함량은 큰 차이를 보였다. 논 토양에서는 유효인산함량이 증가함에 따라 0.01M CaCl2 함량도 직선적으로증가하여 변곡점이 나타나지 않았다. 반면 밭과 시설재배지에서는 토양 유효 인산 함량이 약 520 mg P2O5/kg에서0.01M CaCl2 가용성 인산 함량이 급격하게 증가하는 변곡점이 확인되었다. 따라서 밭과 시설재배지에서 주변 수계로인산 유출량을 저감하기 위해서는 농경지 유효인산 함량을520 mg P2O5/kg 이하로 관리하는 것이 바람직하다고 판단된다.
Abstract
Heavy application of fertilizer and manure in excess from the optimum requirement for crop growth can increase phosphorus (P) accumulation and P release potential in soils. In this study, the relationship between soil test P and 0.01M CaCl2 extractable P was analysed to evaluate the P release potential of agricultural soils under different land-use. The paddy, upland, plastic film house(PFH) soils were sampled from Tongyoung and Changnyeong, and Daegok areas in Gyeongnam province, respectively. With respect to the P accumulation, available P contents in upland and PFH soils were 619 and 796 mg P2O5/kg, respectively indicating that different land-use types can greatly impact soil P accumulation. As soil available P was increased in the paddy soil, the content of 0.01M CaCl2 extractable P also linearly increased without change point. Comparatively, P threshold were detected at 520 mg P2O5/kg in both upland and PFH soils, indicating that P release potential were higher in these land-use systems. For reducing P release from agricultural soils, management of optimum P content is needed in soils possessing high P release potential. Further, the change point value, if it is to be used as an environmental indicator, requires more detailed investigation to cover a wide range of soil characteristics.
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