Growth and Development Law of Annual Sown Seedings of <i>Photinia prunifolia</i> and Preliminary Exploration on Seeding Breeding Technology

Abstract

In this paper, we studied the height and ground diameter growth of annual seedlings of <i>Photinia prunifolia, </i>and introduced its the morphological characteristic and geographical distribution. At the same time, through the seedling sowing and breeding experiment, we used the ordered sample clustering analysis method to analyze the high growth process of seedlings sown in <i>Photinia</i> <i>prunifolia</i>. We divided the growth of seedlings into four different growth periods, seedling stage, growth stage, rapid growth stage and later growth stage according to the experimental investigation. The seedling stage and growth stage of <i>Photinia prunifolia </i>were 30 days. The initial growth period lasted for about 48 days. The rapid growth stage lasted for 120 days, which was 10.1 times and 5.2 times higher than the seedling height and ground diameter growth in initial growth period, respectively. In later growth stage, the seedling height and ground diameter grew quite slowly. The simulation correlation coefficient was as high as 0.99 by simulating seedling height growth and seedling age. The fitting degree was high. It showed that the relationship seedling height growth and seedling age of <i>Photinia prunifolia</i> was highly consistent with the Logistic population growth model. Meanwhile, by using the Logistic population growth curve model to fit the high and diameter growth of <i>Photinia prunifolia</i>, we elucidated the growth law of annual seedlings. Since the seedlings grew in the rapid growth stage, that is, the high growth rate of seedlings grew rapidly with the increase of seedling age, enough nutrient fertilizer should be supplemented at this stage to satisfy the rapid growth of seedlings. Annal seedling biomass accounted for 62.5% of the total biomass, and the fresh-weight ratio of above-ground biomass was 1.67. Therefore, this species has better lodging resistance and is suitable for seedling afforestation. The study provided references for the rational cultivation and utilization of new afforestation tree species.