A land resources survey of the Mula area, S.E. Spain

• 발행기관: 대한자원환경지질학회
• 저자명: Suckew Yun(尹碩奎)
• 간행물 정보: 『자원환경지질』6권 1호, 29~64쪽, 전체 36쪽
• 주제분류: 자연과학 > 지질학
• 파일형태: PDF
• 발행일자: 1973.03.30

국문 초록

亞乾燥地帶인 東南스페인 Mula地域에서 約400㎢에 걸처 1972年 봄에 實施된 本調査의 主目的은 地形學을 應用하여 調査地域을 類似한 地質, 地形, 土壤 및 植物로서 特徵지어지는 一連의 land complex로 分析 綜合하여 內在된 土地資源(land resources)의 特質을 硏究함에 있었다. 本地域은 西北部의 三첩~白堊紀 石灰岩, Eocene 岩石岩 및 Oligocene 砂岩으로 된 褶曲山脈과 丘陵地帶, 中央部의 Miocene marl과 이를 덮는 石灰岩의 蓋岩層으로 된 一連의 卓狀地群과 이에 倂行하는 同 marl과 沖積層으로 된 Mula 江 流域의 低地帶, 그리고 東南部의 Miocene marl 및 石灰質 또는 砂質岩의 互層으로 된 cuesta 地帶로 構成되어 있으며 이들은 東北東-西南西의 方向으로 平行配列을 이루어 基盤岩層의 同斜構造와 이에 대한 差別浸蝕의 結果를 나타내고 있다. 總 26個의 land complex로 分類된 本地域의 土壤은 大體로 淡色 石灰質 鑛物性土壤으로 pH7 以上의 강한 알칼리性을 띰으로서 主로 泥灰質 母物質로 부터 이루어 졌음을 反映하고 있으며 곳에 따라서는 地表의 起伏 條件에 依해 slope catena를 이루고 있다. 本地域에 있어서의 土地利用은 主로 Sequra 및 Mula江 流域의 段丘狀 沖積層上에서의 永久灌漑에 依한 Citrus 栽培와 低勾配 傾斜地에 있어서의 乾陸 穀物耕作으로 特徵지어진다. 高勾配地帶나 shrub 地帶內에서의 先驅的 開간은 主로 天水가 모이는 排水谷을 따라 이루어지고 있으나 이미 그 限界에 달하고 있다. 亞乾燥氣候下에 있는 本地域에 있어서 물의 惠擇은 天然 및 耕作植物의 消長에 있어선 가장 根木的 要因이며 表土流失 및 雨谷作用은 自然保存 및 土地資源管理上 基本的으로 考慮해야 할 重要한 要因이다.

영문 초록

A land resources survey in the semi-arid area, Mula in S.E. Spain, of 400㎢ is compiled. The basic aim of the project is to investigate the intrinsic qualities of the land resources of the area by means of applying an integrated method of natural resources survey mainly concerning with analysis and synthesis of land complexes, each of them represents an area or a group of areas with similar patterns of landforms, soils and vegetation, based on a geomorphological approach. The area is characterized by a linear arrangement of relief pattern with an asymmetric homoclinal repetition of slope attitudes elongating WSW-ENE, dipping steeply on the NW sides and gently on the SE sides, which have been resulted from the post-Alpine folding of the Triassic to Cretaceous limestone, the Eocene limestone, the Oligocene sandstone and the lower Miocene limestone and marl, and the post-lower Miocene faulting, tilting and subsequent differential erosion of the Miocene sedimentary formations. An integrated body of information in geology, landforms, soils and vegetation, which are significantry interrelated as an environmental complex, has been obtained. Using this data, 26 land complexes developing on the various situations of landforms, such as folded mountain ranges, tilted tablelands, bevelled cuestas, degraded hill-lands associating with enormous footslopes, undulating terrains and terraced or flat plains, have been differentiated, mapped and described. The soils of the area are mostly light colored calcic lithosols which have been derived dominantly from the marly parent materials and developed into remarkable slope catenas in some places depending on the relief conditions. The land uses of the area are mainly characterized by the perennially irrigated cultivation of citrus orchards along the terraced alluvial deposits fringing the Segura and Mula River, and the dry-land cereal cultivation on gentler slopes. Pioneer dry-land cultivations within the shrubs on steeper slopes are restricted to the unchannelled tributary drainage floors. The availability of water is a fundamental controlling factor for existence of native and cultivated vegetation as a whole, and a number of active processes including sheet wash and gully erosion, especially on the scarp slopes, are the other important factors to be considered in conservation and management of the land in the area.

목차

Abstract

Introduction

Techniques

Geomorphology of the area

Land complexes of the area

Surface materials of the area

Soils of the area

Vegetation and land-use

AppraisaI of the survey

References

국문초록