Korean Journal of Soil Science and Fertilizer (한국토양비료학회지)
- Volume 19 Issue 2
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- Pages.89-97
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- 1986
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- 0367-6315(pISSN)
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- 2288-2162(eISSN)
Characteristics and Genesis of Terrace Soils in Yeongnam Area -III. Mineralogical Characteristics
영남지역(嶺南地域)에 분포(分布)된 단구지토양(段丘地土壤)의 특성(特性)과 생성(生成) 연구(硏究) -제(第)3보(報) : 광물학적(鑛物學的) 특성(特性)
- Jung, Yeun-Tae (Yeongnam Crops Exp. Station) ;
- Um, Ki-Tae (Agricultural & Sciences Institute) ;
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Jung, Pil-Kyun
(Agricultural & Sciences Institute) ;
- Ha, Ho-Sung (Gyeongsang National University)
- Published : 1986.06.30
Abstract
To clarify the soil characteristics and genesis of the clayey terrace soils in Yeongnam area, the study were carried out with 9 typifying pedons of toposequential terrace soils in Yeongcheon (inland area) and Yeongil (coastal area) region. The results of soil genesis oriented investigations on soil mineralogical compositions and weathering characteristics were summarized as follows; 1. The contents of heavy minerals contained in sand fraction of the terrace soils were less than 5%, but the content in soil layers considered to be originated from other than terrace deposits had 9.8-16.2%. The content of feldspars in light minerals were higher in Yeongcheon sequence while the Yeongil sequence were characterized by having higher content in quartz. The ratios of quartz/feldspars in the soil layers where expecting lithological discontinuity, were different from that of terrace deposits. 2. The resistate index of maturity ranged around 76.7-29.9 in Yeongcheon area and around 85.6-67.2 in Yeongil area. The indices increased with the elevations of terraces. 3. The molar ratios of
영남지역(嶺南地域)에 분포(分布)된 단구지토양(段丘地土壤)의 특성(特性)과 생성(生成)을 구명(究明)하기 위하여 영천(永川)(내륙(內陸)) 및 영일(迎日) (해안(海岸))지역(地域)에서 대표적(代表的)인 단구군(段丘群)을 선정(選定)하여 1, 2차광물(次鑛物)의 조성(助成)과 특성(特性)을 토양생성(土壤生成)과 연관시켜 분석(分析)하여 본 결과(結果)는 다음과 같다. 1. 단구퇴적물(段丘堆積物)의 중세사(中細砂)에 함유(含有)된 중광물(重鑛物)은 5% 이하(以下)이었으나 모재(母材)의 불연속성(不連續性)이 예상되는 토층(土層)에서는 9.8~16.2%로 높았고 경험물(輕驗物) 중(中) 장석류(長石類)의 함량(含量)은 영천지역(永川地域)에서 높은 반면(反面)에 석영(石英)은 영일지역(迎日地域)에서 높았으며 석영(石英)/장석비(長石比)도 모재(母材)의 불연속예상토층(不連續豫想土層)은 단구퇴적물(段丘堆積物)과 구분(區分)되었다. 2. 풍화잔사물(風化殘渣物)의 성숙도지수는 영천지역(永川地域)이 76.7~29.9이었으며 영일지역(迎日地域)은 85.6~67.2로서 고위단구(高位段丘) 일수록 높은 경향이었다. 3. 점토(粘土)의 규반비(珪礬比)는 1.93~2.65로서 낮았고,
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