On the Topographies and Recovery of Vegetation in the Hillside Erosion Control Districts

산복사방공사시공지(山腹砂防工事施工地)에 있어서 지형(地形)과 식생회복(植生回復)

This study was carried out to obtain the advanced basic data for hillside erosion control works. Recovery of vegetation in the hillside erosion control districts depends on various factors i.e., topographies, soil qualities, rain conditions and erosion control methods. The only relations between topographies and vegetation coverage were surveyed, since the other factors were equal in all those surveyed areas. The results obtained are summarized as follows; 1) Mean coverage values were decreased in order of 80%, 78.7%, 64.0% and 56.5%r in concave slope, uniform slope, compound slope and convex slope respectively. The mean coverage of all aspects was 69.8%. The slope pattern have a influence on formation of coverage. 2) Moisture ratio in soil and mean slope have an effect on the mean coverage value. 3) In the beginning of the hillside erosion control working, coverage (14.8%) by arbor species was too low comparing with that by herb. 4) It is more desirable to recover regetation by artificial planting or seed planting than by the natural vegetation in the barren hillside. In the beginning of the hillside erosion control working, it is difficult to expect vegetation recovery by natural species.

산복사방공사시공지(山腹砂防工事施工地)에 대한 식생회복(植生回復)은 지형(地形), 지질(地質), 강수상황(降水狀況), 공법(工法) 등 여러 요인(要因)의 복합작용(複合作用)에 의하여 좌우(左右)되나 본(本) 조사지(調査地)에서는 지형(地形)을 제외(除外)한 타요인(他要因)은 그 조건(條件)이 같으므로 제외하고 지형(地形)과 식생피도(植生被度)의 관계(關係)를 조사하여 산복공사공법(山腹事工工法) 개선(改善)의 자료(資料)를 얻고자 조사연구한 결과는 다음과 같다. 1) 사면별(斜面別) 평균피도(平均被度)는 하강사면(下降斜面)(80%), 평형사면(平衡斜面)(78.7%), 복합사면(複合斜面)(64.0%), 상승사면(上昇斜面)(56.5%)의 순위(順位)로 낮아지며, 4 사면(斜面)의 평균피도(平均被度)는 69.8%로 사면형(斜面形)은 피도형성(被度形成)에 영향을 준다. 2) 평균피도형성(平均被度形成)에는 토양함수율(土壤含率水), 평균경사(平均傾斜)가 영향을 준다. 3) 산복공사시공(山腹工事施工) 초기(初期)에 있어서는 목본종피도(木本種被度)(14.8%)는 초본종(草本種)(55.0%)에 비하여 피도(被度)가 매우 낮다. 4) 독라지(禿裸地)에 대한 식생회복(植生回復) 방법(方法)은 인공식재(人工植栽) 혹은 파종(播種)으로 하여야 하고 특히 산복공사시공(山腹工事施工) 초기(初期)에 있어서는 자연식생종(自然植生種)에 의한 식생회복(植生回復)은 어렵다.