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Chinese Journal of Applied Ecology ›› 2021, Vol. 32 ›› Issue (4): 1184-1192.doi: 10.13287/j.1001-9332.202104.004

• Original Articles • Previous Articles     Next Articles

Effects of P fertilizer on female strobilus and needle N and P nutrition of Pinus massoniana clones with different fruiting abilities.

ZHENG Yi1,2, ZHANG Zhen1*, FAN Jin-gen3, TONG Qing-yuan3, CHEN Sheng-long4, XU Zhi-qi4, ZHOU Zhi-chun1   

  1. 1Research Institute of Subtropical Forestry, Chinese Academy of Forestry/Key Laboratory of Tree Breeding of Zhejiang Province, Fuyang 311400, Zhejiang, China;
    2State Key Laboratory of Tree Genetics and Breeding, Northeast Forestry University, Harbin 150040, China;
    3Lanxi Nursery, Jinhua 321100, Zhejiang, China;
    4Lanxi Forestry Bureau, Jinhua 321100, Zhejiang, China
  • Received:2020-08-23 Accepted:2021-01-28 Published:2021-10-25
  • Contact: *E-mail: zhenzh19860516@163.com
  • Supported by:
    National Key Research and Development Project of China (2017YFD0600301), the Zhejiang Science and Technology Major Program on Agricultural New Variety Breeding (2016C02056-4), the Forestry Science and Technology Innovation Project of Jiangxi Province (201703), and the Central Public Welfare Research Institute Project (CAFYBB2017ZA001-2).

Abstract: In order to realize precise fertilization and high yield management of Pinus massoniana clonal seed orchard, clones with different fruiting abilities were used as the materials. Four P fertilization levels were at 0, 400, 800 and 1600 g per plant (P0, P4, P8 and P16 respectively). Fertilization was applied before floral primordia formation and after cone picked, respectively. The effects of P fertilizer on the female strobilus of P. massoniana clones and the changes of N, P contents in needles of different positions during floral primordia formation stage and early stage of flower bud differentiation were investigated. The results showed that compared with P0, the female strobilus of P8 and P16 were significantly increased by 67.4% and 61.2% in 2018 and 28.9% and 14.1% in 2019, respectively. There was a significant negative correlation between the female strobilus with the N content and N/P, a significant positive correlation between the female strobilus and the P content in needles. The responses of N and P contents in needles to P fertilization differed in clones with different fruiting abilities. In floral primordia formation stage, the N content of clones with weak fruiting ability was high, and the N/P was 11.5-12.5, while the P content of clones with strong fruiting abilities was high, and the N/P was 9.5-10.5. During this period, the P content of most clones under P8 treatment was the highest, while the N/P was lowest. In the early stage of flower bud differentiation, the N/P of two fruiting clones was 15.3-17.0 and 13.2-15.1, respectively. The P content in upside layer was significantly higher while N/P was significantly lower than that in middle and lower layers. In conclusion, the 800 g P fertilization per plant could increase the P content and reduce the N/P of needles during the floral primordia formation stage of clones with diffe-rent fruiting abilities, which was beneficial to the formation of female strobilus and promote the yield of clone seed orchards.

Key words: Pinus massoniana, clone, fused calcium magnesium phosphate, female strobilus, nitrogen and phosphorus nutrition