Abstract
Multifunctionality of agriculture which cannot be in trade has internationally an important issue due to its environmental and public benefits. The purpose of this study was to estimate economic value of upland farming in cooling effect during hot summer. Economic value of cooling effect was evaluated by the replacement cost method. To evaluate the cooling effect from July through August, the amount of evapotranspiration in upland was estimated using crop coefficients and soil water coefficients perviously reported by several researchers. In July and August, average crop coefficient of fourteen major upland crops was 1.19 and average soil water coefficient of major textures of upland soil was 0.91. The estimated evapotranspiration in upland from July through August was $1,224{\times}10^6Mg$, and this amount of evapotranspiration can consume $7.1{\times}10^{14}kcal$ of heat. When these values were converted to the price of petroleum, the economic value of cooling effect by upland farming from July through August was about 12 trillion won.
밭농사의 다원적 기능 중 여름철 고온기의 기후순화 기능을 일증발산량으로 평가하였는데, 일증발산량은 우리나라 주요 밭작물의 평균작물계수와 밭토양의 평균 토양수분계수를 이용하여 추정하였다. 7월부터 8월 사이의 고온기간 중 밭농사에 의해 날아간 수분증발산량은 ha당 1,676 Mg으로 추정되었으며, 밭 면적 전체로는 $1.224{\times}10^6Mg$에 해당되었다. 이러한 수분의 증발산을 통한 기후순화기능의 경제적인 가치를 기화열로 환산하면 $7.1{\times}10^{14}kcal$에 해당하였으며, 이 열량을 냉방용 석유 값으로 평가하면 12조 3,412억원에 해당되었다.
