The Research On Glauca Seedling Breeding Technology And Photosynthetic Characteristicsby

Cyclobalanopsis glauca is fagaceae evergreen plants. It is one of the most widely distributed species in subtropical evergreen broadleaf forest. Cyclobalanopsis glauca is the country’s eastern humid subtropical evergreen broad-leaved forest dominant species, but also China’s eastern subtropical main afforestation tree species. It is Hunan, Jiangxi, Fujian and other subtropical regions of superior native broadleaf valuable timber species. In this paper, carried out experimental studies of glauca seed dormancy characteristics and fertilization techniques and photosynthetic characteristics of seedlings. These studies provide theoretical basis and technical support for the improvement of Cyclobalanopsis glauca seed germination rate and seedling breeding level. These following conclusions are drawn from the study:1. Fresh and complete Cyclobalanopsis glauca seeds has low germination rate(46.7%). It has some dormancy characteristics. The peeling seed germination rate was high (88.3%). The seed coat was major factor to cause of seed dormancy. The seed coat with poor ventilation impeded the entry of oxygen, weakening the embryo’s metabolic capacity is one of the causes of seed dormancy. The methanol extracts and water extracts from the seed coat had obvious inhibitory effort the seed germination and root length growth of the seedlings, this suggests that germination inhibiting substances in seed coat is another important cause of seed dormancy.2. The seed stored in low temperature and ambient temperature with wet sand can significantly improve glauca seeds seed coat permeability, with the extension of storage time in favor of the seed coat permeability. The effect of low temperature and wet sand storage is better than that of ambient temperature.3. Low temperature and ambient temperature for storing seed with wet sand can break the dormancy of Cyclobalanopsis glauca seeds and increase the germination rate. The way of low temperature preserve seed with wet sands could release the seed dormancy more effectively than the normal temperature.25 ℃ in the environment, the highest germination rate of Cyclobalanopsis glauca seeds.4. The effect of different fertilization levels on growth of seedlings of Cyclobalanopsis glauca in each period is different. In terms of height, at the beginning of fertilization, high levels of nitrogen treatment in favor of beech ridge height growth, the lack of nitrogen is not conducive to the growth of height. In the late growth stage, the allocation of processing element balance is most conducive to high growth, high levels of nitrogen and no nitrogen treatment is not conducive to the growth of seedling height. The ratio of nitrogen, phosphorus and potassium in the fourth groups was 2:1:2, which could get good results.5. The biomass of seedlings as comprehensive evaluation criterion, using a combination of nitrogen, phosphorus and potassium of three kinds of fertilizers has relatively good performance, while the fourth group 4 (N2:P1:K2) fertilizer treatment effect is the best.6. In July-October chlorophyll content tended to increase in the state, the highest content in October, November-December glauca chlorophyll content decreased. The different fertilizers proportion of Cyclobalanopsis glauca seedlings chlorophyll content are higher Cyclobalanopsis glauca chlorophyll content than the control group. Nitrogen is more, higher chlorophyll content. Nitrogen fertilizer can improve the chlorophyll level of Cyclobalanopsis glauca seedlings.7. In different fertilization combinations,4,5,6,7 groups of Cyclobalanopsis glauca seedlings of net photosynthetic rate is higher, of which the fourth combined effect is the best.