CAJ | 학술논문

在盆栽条件下,对一年龄黄花苜蓿(Medicago falcata L.)叶片光合蒸腾特征和光合有效辐射(PAR)、空气CO_2浓度(C_a)、空气相对湿度(RH)、空气温度(T_a)等环境因子的日变化进行测定,并采用相关系数、偏相关系数和逐步回归方法分析了黄花苜蓿光合蒸腾特性日变化与环境因子的关系.结果表明,光合速率(P_n)和蒸腾速率(T_r)日变化均呈单峰曲线,12:00左右达到峰值,并且没有光合"午休"现象. P_n和T_r与PAR之间呈极显著正相关,与其它环境因子相关不显著,这说明对光合蒸腾特征起决定作用的环境因子是PAR.
재분재조건하,대일년령황화목숙(Medicago falcata L.)협편광합증등특정화광합유효복사(PAR)、공기CO_2농도(C_a)、공기상대습도(RH)、공기온도(T_a)등배경인자적일변화진행측정,병채용상관계수、편상관계수화축보회귀방법분석료황화목숙광합증등특성일변화여배경인자적관계.결과표명,광합속솔(P_n)화증등속솔(T_r)일변화균정단봉곡선,12:00좌우체도봉치,병차몰유광합"오휴"현상. P_n화T_r여PAR지간정겁현저정상관,여기타배경인자상관불현저,저설명대광합증등특정기결정작용적배경인자시PAR.
The photosynthetic and transpiration characteristics of one year old Medicago falcata L. and photosynthetic active radiation (PAR), CO_2 concentration in air (C_a), air relative humidity (RH), and air temperature (T_a) were measured under potted conditions and the relationships between the diurnal dynamics of photosynthetic rate (P_n), transpiration rate (T_r) and environmental factors were analyzed by correlation coefficient, partial correlation coefficient, and stepwise multi-regress. The results show that the diurnal dynamics of P_n and T_r was of one-peak curve with the peak appeared at 12:00 pm and no photosynthetic midday depression was detected. P_n and T_r were significantly positively correlated with photo flux density (PFD), but never significantly correlated with other environmental factors. In summary, PAR would be the primary determining factors for the photosynthesis and transpiration characteristics of M. falcata.