CAJ | 학술논문

用LCA-4型便携式光合测定仪,在自然条件下,于8月上旬的晴朗天气对乌药(Lindera aggregata)叶片光合作用日进程进行测定.结果表明:全光照环境下乌药叶片的净光合速率的日进程曲线呈双峰型,在午间出现明显的"午休"现象.胞间CO_2浓度的日进程基本与净光合速率相反,中午胞间CO_2浓度增高,表明净光合速率午间降低主要受非气孔限制因素的影响.暗呼吸速率日进程呈单峰曲线,中午最高.用逐步多元回归方法得到净光合速率日变化的最优化方程为:Y=118.098 4+0.012 2X_1- 0.767 0X_3- 3.231 3X_4(复相关系数R=0.987 3,F=38.488 7,显著水平P=0.006 8,剩余标准差S=0.689 7).偏相关分析和通径分析表明,光合有效辐射、空气相对湿度和气温与净光合速率的日变化有着极显著或显著的相关关系,是影响乌药光合速率主要的环境因子,影响大小的顺序为:气温>光合有效辐射>空气相对湿度.
용LCA-4형편휴식광합측정의,재자연조건하,우8월상순적청랑천기대오약(Lindera aggregata)협편광합작용일진정진행측정.결과표명:전광조배경하오약협편적정광합속솔적일진정곡선정쌍봉형,재오간출현명현적"오휴"현상.포간CO_2농도적일진정기본여정광합속솔상반,중오포간CO_2농도증고,표명정광합속솔오간강저주요수비기공한제인소적영향.암호흡속솔일진정정단봉곡선,중오최고.용축보다원회귀방법득도정광합속솔일변화적최우화방정위:Y=118.098 4+0.012 2X_1- 0.767 0X_3- 3.231 3X_4(복상관계수R=0.987 3,F=38.488 7,현저수평P=0.006 8,잉여표준차S=0.689 7).편상관분석화통경분석표명,광합유효복사、공기상대습도화기온여정광합속솔적일변화유착겁현저혹현저적상관관계,시영향오약광합속솔주요적배경인자,영향대소적순서위:기온>광합유효복사>공기상대습도.
The diurnal variation of photosynthesis of Lindera aggregata was studied by the LCA-4 Portable Photosynthesis System under natural conditions on clear days of mid-August. The results were as follows. The curve of net photosynthetic rate (P_n) in the leaves of L. aggregate under full light was bi-peak type with an obvious midday depression phenomenon at noon. The diurnal variation of internal CO_2 concentration (C_i) was opposite to P_n. The increase of C_i at midday indicated that the midday depression of the photosynthetic efficiency was mainly influenced by the non-stomatal factors. The diurnal variation of the dark respiration rate (R) was single-peak type and was the highest at midday. The optimization equation for the diurnal variation of P_n was calculated by stepwise multiple-regression method (Y=118.098 4 + 0.012 2X_1- 0.767 0X_3 - 3.231 3X_4, R= 0.987 3, F= 38.488 7, P= 0.006 8, S=0.689 7). The partial correlation and path analysis showed that the diurnal variation of P_n had significant correlationship with air temperature (T_a), photosynthetic effective radiation (PAR) and air relative humidity (RH), respectively. This indicated that PAR, RH and T_a might play important role in the P_n and ranked as T_a>PAR> RH.