施肥对落叶松种子园母树物候特征的影响.

In order to explore the effects of fertilization on the phenological period of the mother tree of Larch seed garden, this study selected the mother tree of Larch seed garden of 1. 5 generation and 2 generation as the research object. Different proportions and doses of nitrogen, phosphorus and potassium fertilizer were used as experimental treatments to observe and analyze the phenological phases of the mother tree, such as bud expansion, bud spreading, bud capping, male flower bud emergence and male flower flowering. The results showed that fertilization had little effect on bud growth, and the bud growth of main branches was mainly concentrated between April 18 and April 20. Fertilization had a certain effect on bud development, among which, the beginning of main bud development was mainly concentrated from April 26 to April 30, and the complete leaf development of main bud was mainly concentrated from May 20 to May 24. Fertilization treatment had a certain effect on bud capping. The beginning of bud capping of main branch mainly began from August 17 to 27. The complete capping of main shoots mainly occurred from August 26 to September 9. Fertilization also had a certain impact on the growth period. The growth period of different fertilization treatments varied from 131d to 143 d. The onset of flowering of male flowers was mainly concentrated from April 13 to April 18, with a difference of 5d between treatments. The peak flowering period of male flowers was mainly concentrated from April 16 to April 22, with a difference of 6d among different treatments. The final flowering period of male flowers was mainly concentrated from April 19 to April 26, with a difference of 7 d among different treatments. Fertilization had a certain effect on the flowering period, which varied from 6d to 8d among different treatments. Range analysis showed that no matter the growth phenology or flowering phenology, the effects of different kinds of fertilizers were N fertilizer, P fertilizer and K fertilizer in the order from large to small. The application of medium amount of N fertilizer and P fertilizer, and high amount of K fertilizer was beneficial to the growth and flowering of the mother tree of larch seed orchard. The results provided theoretical support and technical reference for the rational fertilization of larch seed orchard and the improvement of seed yield and quality of larch mother tree. [ABSTRACT FROM AUTHOR]