The Influence of Micro-fertilizer on Growth and Photosynthetic Physiological Effects of Castanopsis hystrix Seedlings
In order to reveal the application potential of micro-fertilizer in Castanopsis hystrix seedlings,taking Cas-tanopsis hystrix seedlings as the experimental materials,the effects of single or compound micro-fertilizers,including MnCl2 H2O(Mn),FeSO4·7H2 O(Fe),ZnSO4·7H2 O(Zn)and CuSO4·5 H2O(Cu)on the growth and photosyn-thetic physiology of seedlings were studied by foliar spraying.The results showed that in the range of 0-50 mg· L-1,single micro-fertilizers,like Mn,Fe,Zn or Cu,had significant effects on seedling height increment,but with the increase of application amount,the variation trend of seedling height increment under each micro-fertilizer treatment was different.Among them,in the case of Mn 30-50 mg·L-1,Fe/Zn 30 mg·L-1,Cu 10-20 mg·L-1,the incre-ment of seedling height under each micro-fertilizer treatment was the largest.There were significant differences in seedling height increment among 16 compound micro-fertilizer treatments based on orthogonal design.The growth effect of seedling height was the best under micro-fertilizer treatment(MF14)of Mn30 mg·L-1+Fe20 mg·L-1+Zn10 mg·L-1+Cu15 mg·L-1,and the seedling height increment increased by 158.8％compared with the unferti-lized control(CK)treatment.The application of compound micro-fertilizers had no significant effect on the diurnal variation trend of photosynthetic rate of seedling leaves,and the peak value of net photosynthetic rate(Pn)still ap-peared at 10:00 a.m.,but Pn increased significantly compared with CK treatment at 12:00-14:00 with the strongest light.Compared with CK and MF14 treatments,under the optimized Mn30 mg·L-1+Fe 20 mg·L-1+Zn 10 mg· L 1+Cu 10 mg·L-1(OM)treatment,the above ground biomass increment and chlorophyll content were the high-est,and the intercellular carbon dioxide concentration was the lowest.The results showed that the application of compound micro-fertilizer could significantly improve the growth quality and photosynthetic capacity of Castanopsis hystrix seedlings,and the effect of 30 mg·L-1Mn+20 mg·L-1 Fe+10 mg·L-1 Zn+10 mg·L-1 Cu was the best.
万方数据
维普
