초록

AI-Helper

생육후기(生育後期)의 환경조건(環境條件)에서 토양수분함량(土壤水分含量)이 수수류(類)의 광합성(光合成), 증산(蒸散), 기공저항(氣孔抵抗)의 일변화(日變化)에 미치는 영향(影響)을 비교(比較)할 일적(日的)으로 1985년도(年度) 축산시험장(畜産試驗場)의 포장(圃場)에서 대형(大型) 콘크리트 폿트에 토양수분(土壤水分)을 포장용수량(圃場容水量)의 100, 80, 60 및 40%가 유지되도록 조절(調節)하고 수수와 수수${\times}$수단그라스교잡종(交雜種)을 재배(栽培)한후(後) 쾌청한 날을 택(擇)하여 2시간(時間) 간격으로 광합성(光合成)을 측정(測定)하였다. 1. 광합성(光合成)과 증산량(蒸散量)은 환경(環境)의 영향을 받아 정오(亭午)와 오후 2시(時)에 가장 높았고 오후(午後) 4시(時)부터는 급격히 저하(低下)되었다. 2. 수수의 경우 광합성(光合成)과 증산량(蒸散量)은 60%수분구(水分區)가 높았고 다른 수분구(水分區) 사이에는 유의차(有意差)가 없었으나 수수${\times}$수단그라스교잡종(交雜種)의 경우에는 광합성(光合成)은 60>80>40>100%순(順)이었고 증산량(蒸散量)은 60>80>100>40%순(順)이었다. 3. 기공저항(氣孔抵抗)은 뚜렷한 일중변화(日中變化)를 나타내지 않았으며 60%수분구(水分區)가 기공(氣孔)의 저항(抵抗)을 가장 적게 받았다.

Abstract ▼ AI-Helper

To determine the effects of soil moisture on diurnal changes of photosynthesis, transpiration and stomatal resistance, sorghum and soghum-sudangrass hybrid were grown at large concrete pots maintained at 100, 80, 60 and 40% of field moisture capacity. Photosynthesis were measured from a.m. 6 to p.m....

To determine the effects of soil moisture on diurnal changes of photosynthesis, transpiration and stomatal resistance, sorghum and soghum-sudangrass hybrid were grown at large concrete pots maintained at 100, 80, 60 and 40% of field moisture capacity. Photosynthesis were measured from a.m. 6 to p.m. 6 on a fine day. 1. Photosynthesis and transpiration reacted similarly to water stress and environmental factors, and they reached at their maximum points from noon to 2 p.m. and decreased sharply after 4 p.m. 2. Photosynthesis and transpiration of sorghum were higher at 60% field moisture capacity than those of the other field moisture capacities. In sorghum-sudangrass hybrid, photosynthesis was in the order of 60>80>40>100% and transpiration was in the order of 60>80>100>40%. 3. Stomatal resistance did not show clear diurnal change and was the lowest at 60% among four field moisture capacities.