http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
스플라인 모형을 이용한 우리나라의 층위별 토성 지도 작성
홍석영 ( Sukyoung Hong ),( Budiman Minasny ),송관철 ( Kwancheol Song ),현병근 ( Byungkeun Hyun ),김이현 ( Yihyun Kim ),이경도 ( Kyungdo Lee ),이덕배 ( Deogbae Lee ) 한국농공학회 2012 한국농공학회 학술대회초록집 Vol.2012 No.-
Quantitative soil information is important, soil properties at different depths are very useful information to model water quantity & quality and crop growth. This paper estimates soil texture such as clay, sand, and silt content at the 6 standard depths using the equal-area smoothing spline functions. A Korean soil database of 380 soil series was compiled, which includes chemical and physical properties such as sand and clay content for the profiles of each soil series. We applied the equal-area spline depth functions for sand, silt and clay content. Derived mean values of sand, silt and clay content from the fitted spline at standard depths were mapped by corresponding soil series to produce rasterized spatial and depth-wise soil property maps. Mean values of clay content were 12.2% at 0-5 cm, 12.4% at 5-15 cm, 12.8% at 15-30 cm, 12.7% at 30-60 cm, and 11.2% at 60-100 cm, respectively. Clay content evenly distributed at different depths. Standard deviation from 0-5 cm to 30-60 cm showed similar values and increase abruptly at deeper than 60 cm. We also compared the results to recently collected soil samples to estimate the accuracy of the maps. Scatter plot of recently measured and predicted clay content showed good agreement.