| In this paper, we object to five clones of Catalpa bungei cultivated by the Henan Luoyang institute of forestry, and five cultivars of C. bungei from Binxian, Shaanxi, Penglai, Shandong, Zhoukou, Henan,Langya Mountain, Hebei, Wenxi, Shanxi. Planting the annual seedlings of the above species in Weihe experimental station of Northwest Agriculture and Forestry University(Shaanxi Zhouzhi). Making the adaptability evaluation of C. bungei from the growth, photosynthesis, pest resistant ability and the content of secondary metabolites. At the same time, the effects of soil nutrients on their growth and secondary metabolite accumulation were studied, and the photosynthetic difference of different mode of cultivation was also studied. The main results were as follows:1. We took the growth of plant, pest resistant ability and photosynthetic characteristics as evaluation criteria, found that the clone 2-6 from Henan Luoyang have the strongest adaptability, followed by the clones 1-1, 1-4, 9-1 and 2-7; The C. bungei from Wenxi Shanxi, Hebei Langya Mountain, Shaanxi Binxian had the worst adaptability; The C. bungei from Penglai, Shandong and Zhoukou, Henan had the moderate adaptability. The 5 clones from Luoyang, Henan are suitable for planting in Weihe plain of Shaanxi.2. The content of total flavonoids in leaves in Penglai, Shandong is the highest(19.18 mg/g) and the lowestt otal flavonoid content is the clone 1-4(8.74 mg/g) and Shanxi Wenxi C. bungei(8.79 mg/g); there is little difference of the total flavonoids content among the rest of the introducted catalpa., around 10mg/g. the content of monomer flavone, as the luteolin content of Henan Zhoukou bungei clones and 2-6 chinense leaves is higher, chinense leaves of celery pigment content from Binxian, Shaanxi and Shanxi Wenxi is 1308.7 7 ug/g and 1176.8 ug/g, much higher than other C. bungei. This provides the foundation for the subsequent directional selection and cultivation of high quality flavonoid content of C. bungei.3. The content of phosphorus and potassium in soil have strong correlation with the plant height(R>0.8), nitrogen have the strong correlation with the size of C. bungei(R>0.8), nitrogen can extend the fast growing period of diameter, phosphorus and potassium make the fast-growing period of C. bungei advance and extend.4. The changes of Ci and Gs were relatively stable in June and September,in which light intensity is relatively weak, the photosynthetic rate is directly determined by the intensity of illumination, and is the main factor affecting the photosynthesis; the changes of Gs and Ci showed a complex bimodal curve in July and Augustin,and is same to the change of photosynthetic rate, Gs and Ci is the main factors affecting the photosynthetic rate.5. The transpiration rates in June of two kinds of cultivation methods of C. bungei were small; transpiration rate of two models were higher in 7, 8 month because of high temperature and strong light irradiation, whiche accelerates the radiation; In september,transpiration rate of high-forest model is smaller, and transpiration rate of leaf-forest model is still high, due to more intensive cultivation mode, which is heat slowly. In the hot summer season, transpiration cooling cultivation mode is better than the leaf-forest cultivation mode.The above research from plant growth, photosynthetic characteristic, anti insect pestability as well as the synthesis and accumulation of secondary metabolites, screening the suitable C. bungei clones planting on Shaanxi Weihe and providing a basis on C. bungei and standardized cultivation of Chinese catalpa of directional training. |
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