水肥耦合对西兰花光合及叶绿素荧光参数的影响
Abstract[Objective] To investigate the effect of different water and fertilizer combinations on chlorophyll fluorescence parameters of broccoli. [Method] Using field experiment,set up 12 water and fertilizer treatments,photosynthetic characteristics of broccoli at different growth stages,and broccoli chlorophyll fluorescence parameters measured at harvest time were studied. [Result] The results showed that after broccoli spent by soil drought and salt stress,the Pn,Gs,Ci,and Tr of leaf significantly decreased. PS II actual energy conversion efficiency (ΦPSII),photochemical conversion rate (Fv/Fm),photosystem II activity (FV/F0)and photochemical quenching (qP)showed firstly increased then decreased. [Conclusion] Photochemical conversion rate (Fv/Fm)is high and photosynthetic parameters is suitable in the middle water and fertilizer combination. So the middle water and fertilizer combination can increase the interaction of water and fertilizer. It has a certain value.
Key words Broccoli;Water and fertilizer coupling;Photosynthetic characteristics;Chlorophyll fluorescence 甘肃地区太阳辐射强,蒸发量大,降雨少,降水量时空分布不均等,属温带大陆性干旱气候。干旱一直以来是制约该地区农业生产的一个重要因素。近年来,甘肃作为高原夏菜的主要产区一直被缺水现状所困扰。西兰花生长习性符合西北高原夏季凉爽、日照充足、昼夜温差大等气候特点,同时具有味道鲜美、营养价值高、维生素C含量丰富、防癌、抗衰老等特点,因此西兰花已成为高原夏菜的主要品种之一。
水肥是制约西兰花生长发育的关键因素,在很大程度上决定了西兰花的产量高低和品质优劣。有关水肥对作物产量影响的研究已有很
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