矮林芳樟扦插苗生长及养分累积特征.

In order to investigate the growth and nutrient accumulation characteristics of Cinnamomum camphora (L.) Presl coppice cutting seedlings, and provide better guidance for fertilizer application. The plant height, biomass and nutrient content of Cinnamomum camphora (L.) Presl coppice cutting seedlings under the current customary planting pattern in Jiangxi area were dynamically monitored. This study dynamically monitored the plant height, biomass and nutrient content of Cinnamomum camphora coppice cutting seedlings under the current customary planting pattern in Jiangxi area. The results show as follows. The plant height, biomass and C, N, P and K accumulation of Cinnamomum camphora (L.) Presl coppice cutting seedlings can fit with the Logistic equation. The determination coefficient (R²) of each index is between 0. 962 and 0. 994 in the fitting equation, and the growth rate all change with the mono peak rule of “slow-fast-slow”. The rapid growth period of plant height and biomass start from May 16th to August 17th and From June 26th to September 14th, respectively. The duration of rapid growth for both indexes is 93. 7 d and 79. 8 d, correspondingly. The maximum growth rate of plant height is 0.26 cm/d occurred on July 2nd, and the maximum growth rate of biomass is 0. 24 g / (d·m²) occurred on August 5th. The accumulation patterns of C, N, P, and K are not entirely consistent with biomass. The duration of rapid accumulation of C and P is roughly the same as that of biomass, with 81. 1 d and 77. 4 d, respectively. The N accumulation start late (June 30th) and end early ( September 3rd), and the K accumulation start the earliest ( June 26th) and end the earliest (August 22nd). The rapid accumulation duration of N, K are 64. 7 d and 57. 1 d, with 15. 1 d and 22. 7 d lower than the biomass respectively. In conclusion, the results show that the increase of plant height, biomass and nutrient accumulation of Cinnamomum camphora (L.) Presl coppice cutting seedlings change over time under the current customary planting pattern. Biomass growth obviously lags behind the plant height, and the end and duration time of N and K accumulation are smaller than biomass. The results indicate that And there is an obvious shortage of N and K in the late growth stage of Cinnamomum camphora (L.) Presl coppice cutting seedlings under the current customary planting pattern. In order to ensure the nutrients that Cinnamomum camphora (L.) Presl cutting seedlings need for its normal growth, appropriate amount of N and K fertilizers should be applied in the later stage according to its growth and nutrient accumulation characteristics. [ABSTRACT FROM AUTHOR]