Abstract
Highland regions for farming are generally located in slopes higher than 7%, where alpine farming systems rely on highly input agriculture management with great amounts of chemical fertilizer and/or compost. Most of the uplands is thus needed to maintain environmentally friendly soil management due to its impact on soil erosion and runoff during heavy rainfall season. Therefore, the objective of this research is to evaluate the effect of reduction of soil erosion by applying four wild edible greens (fatsia, goat beard, leopard plant, and aster). The lysimeter experiment of slope gradients of 15, 30, and 45% was conducted in an alpine region of Hoengkye, Kangwon, in 2005 and 2006. In 2005, both amounts of soil loss from the experiment plots cultivated with goat beard and aster were lower than one with Chinese cabbage by about 50%. The amounts of runoff of goat beard and aster plots were also lower than those of the others. An increase in the slope gradients was accompanied with an increase in runoff. Of the plots of slope gradient of 15, 30, and 45%, S of goat beard plots was 52.50, 108.33, and 171.50 kg, respectively. Soil loss of Chinese cabbage was 2 to 3 times as high as those of goat beard plots. These results suggest that goat beard and aster plants with minimum tillage reduce soil erosion compared to Chinese cabbage cultivation.
고랭지 농업은 표고가 높은 산지의 경사지에서 이루어지고 있고, 비료 및 퇴비 등의 고투입농법에 의존하고 있기 때문에 토양유실 가능성이 상당히 높고 따라서 환경에 악영향을 미칠 가능성이 크다. 이 연구는 식생을 이용한 토양 유실저감효과를 규명하기 위하여 경제성이 있는 산채작물을 재배함으로서 이들의 토양 유실 저감 정도를 평가하였다. 2005년 실험에 따르면 배추포장에 비하여 눈개승마와 참취 포장의 토양 유실량은 1/2로 저감되었으며, 유출량 또한 상대적으로 눈개승마 재배 포장과 침취 재배 포장에서 낮은 것으로 나타났다. 경사도(15%, 30%, 45%)에 따른 토양유실량은 경사도가 증가할수록 증가하였으며, 15% 포장에서 눈개승마의 경우 52.50 kg, 30% 포장에서 눈개승마의 경우 108.33 kg, 45% 포장에서 눈개승마의 경우 171.50 kg로 나타났으며, 배추포장의 경우는 눈개승마 포장에 비해 2~3배 많은 토양 유실량을 보였다.
