生姜不同叶位叶片光合特性研究

Study on Photosynthetic Characteristics of Different Leafposition Leaves in Ginger

对生姜不同叶位叶片光合特性研究表明，中位叶光合速率（Ｐｎ）最高，其次为下位叶，上位嫩叶最低。生姜不同叶位叶的光补偿点在１８４６～３０８２μｍｏｌ／ｍ２·ｓ间，中位叶＞上位叶＞下位叶；光饱和点为６２４８～８２７６μｍｌｏ／ｍ２·ｓ，中位叶＞下位叶＞上位叶。生姜叶片的ＣＯ２补偿点为２９６～１６３８μｌ／Ｌ，饱和点为１４９９～１５８２μｌ／Ｌ，中位叶最低，下位叶次之，上位叶最高。生姜叶片Ｐｎ日变化呈一双峰曲线，第１次高峰出现在９：００，第２次高峰在１３：００～１４：００。第１侧枝叶的Ｐｎ明显大于主枝叶的Ｐｎ。

This experiment was carried out to study the photosynthetic characteristics of different leafposition leaves in ginger The result showed that photosynthetic rate (Pn) of midposition leaf was the highest, secondly in lowerposition leaf, and the lowest in upperposition leaf The light compensation point of different leafposition leaves was among 1846～3082 μmol/m2·s,and it was the highest in midposition leaf, lowest in lowerposition leaf The light saturation point was among 6248～8276 μmol/m2·s, and that of upper, middle and lower position leaves was 6248,8276 and 7995 μmol/m2·s respectively CO2 compensation point in upper, middle and lower position leaves was 1638, 296 and 714 μl/L Respectively CO2 saturation point in upper, middle and lower position leaves was 1 5433, 1 4990 and 1 5820 μl/L Respectively diurnal variation of Pn in different leafposition leaves was the double peak curve, and first peak was at about 9:00 AM,second one appeared among 13:00～14:00