香根草腋芽动态与不同龄株光合特性的研究

Study on the axillary bud dynamic and different age tillers' photosyntheticcharacteristics of Vetiveria zizanioides

对香根草腋芽、株高、分蘖数及不同龄级分蘖株光合特性进行了研究.结果表明:6-10月份香根草腋芽萌发与植株生长表现相互抑制作用,9月份腋芽萌发数最多,7月份最少,分蘖速度在8月份有明显提高,6月和9月份腋芽活力较高,分别为91%和86%,8月和10月份腋芽活力较低,均为61%.香根草一龄和二龄腋芽占绝对优势,最大龄级为4龄;二龄分蘖株净光合速率显著高于一龄和三龄分蘖株,且最大净光合速率最大,为14.534mol.m-2.s-1,分别比一龄和三龄分蘖株的净光合速度高12.1%和33.4%.

The axillary bud,plant height,tiller number and photosynthetic characteristics of different age tillers of vetiver grass were studied.The results showed that there was an interaction of reciprocal inhibition between axillary bud germination and plant growth during June to October.The number of germinated axillary bud was highest in September and lowest in July.The tilling rate increased in August,the vitality of axillary bud were higher both in June and September while same lower in August and October,which were 91 % and 86 % as well as 61 %.The one year old and two years old axillary buds of vetiver grass had the absolute advantage,the oldest was four years.The net photosynthetic rate of two years old tiller was significantly higher than one year old and three years old tillers,which was 14.534 mmol·m-2·s-1 and was 12.1 % and 33.4 % higher than one year old and three years old tillers respectively.