亚热带植物科学
亞熱帶植物科學
아열대식물과학
SUBTROPICAL PLANT SCIENCE
2010年
1期
25-28
,共4页
四季桂%光合特性%季节变化
四季桂%光閤特性%季節變化
사계계%광합특성%계절변화
Osmanthus fragrans var. semperflorens%photosynthetic characteristics%seasonal change
采用LI-6400光合测定仪测定四季桂光响应曲线和光合特性的季节变化.结果表明,四季桂叶片的光响应曲线变化趋势基本一致,净光合速率和光补偿点由低到高依次为1月＜4月＜10月＜7月,光饱和点依次为7月＜10月＜4月＜1月.四季桂叶片Pn、Tr、VPD、Gs的日变化表现为1月和4月均为单峰曲线, 10:00达到峰值;7月和10月均为"双峰型",具有明显的光合"午休"现象.1月,Ci持续下降;4月Ci先逐渐下降,15:00出现小峰值;10月和7月,Ci在10:00最低,15:00达到峰值.
採用LI-6400光閤測定儀測定四季桂光響應麯線和光閤特性的季節變化.結果錶明,四季桂葉片的光響應麯線變化趨勢基本一緻,淨光閤速率和光補償點由低到高依次為1月＜4月＜10月＜7月,光飽和點依次為7月＜10月＜4月＜1月.四季桂葉片Pn、Tr、VPD、Gs的日變化錶現為1月和4月均為單峰麯線, 10:00達到峰值;7月和10月均為"雙峰型",具有明顯的光閤"午休"現象.1月,Ci持續下降;4月Ci先逐漸下降,15:00齣現小峰值;10月和7月,Ci在10:00最低,15:00達到峰值.
채용LI-6400광합측정의측정사계계광향응곡선화광합특성적계절변화.결과표명,사계계협편적광향응곡선변화추세기본일치,정광합속솔화광보상점유저도고의차위1월＜4월＜10월＜7월,광포화점의차위7월＜10월＜4월＜1월.사계계협편Pn、Tr、VPD、Gs적일변화표현위1월화4월균위단봉곡선, 10:00체도봉치;7월화10월균위"쌍봉형",구유명현적광합"오휴"현상.1월,Ci지속하강;4월Ci선축점하강,15:00출현소봉치;10월화7월,Ci재10:00최저,15:00체도봉치.
The seasonal changes of light response curve and photosynthetic characteristics of Osmanthus fragrans var. semperflorens were determined by LI-6400. The results showed that the light response curve changes of O. fragrans var. semperflorens's leaves at different seasons were similar. The net photosynthetic rate and light compensation point were Jan<Apr<Oct<Jul, and the light saturation point was Jul<Oct<Apr<Jan. The day changes of Pn, Tr, VPD and Gs of O. fragrans var. semperflorens were single peak curve separately at January and April, while double peak curve and had photosynthetic "lunch-break" atmosphere at July and October. The seasonal change of Ci was that Ci decreased continuously at January, while decreased first and then reached a small peak value at 15:00 at April, and appeared the lowest point at 10:00 and the highest point at 15:00 at July and October.
