矮林芳樟扦插苗生长及养分累积特征

为了解矮林芳樟扦插苗的生长及养分累积特征,以更好地指导肥料施用,对江西地区当前习惯种植方式下矮林芳樟扦插苗的株高、生物量、植株养分含量等进行了动态监测。结果表明：矮林芳樟扦插苗的株高、生物量及C、N、P、K累积量均可用Logistic方程拟合,各指标拟合方程的决定系数(R²)在0.962～0.994,各指标的增长速率均表现为“慢-快-慢”的单峰变化规律。株高与生物量的快速增长期分别为5月16日—8月17日和6月26日—9月14日,快速增长持续时间分别为93.7 d和79.8 d,株高的最大增长速率0.26 cm/d出现在7月2日,生物量的最大增长速率0.24 g/(d·m²)出现在8月5日。植株C、N、P、K养分累积量与生物量的变化规律不完全一致,C、P的快速累积持续时间与生物量大体相当,分别为81.1 d和77.4 d;而N的快速累积启动较晚(6月30日)、结束较早(9月3日),K的快速累积启动最早(6月26日),结束也最早(8月22日),二者的快速累积持续时间分别为64.7 d和57.1 d,比生物量分别减少了15.1 d和22.7 d。...

Study on Growth and Nutrient Accumulation Characteristics of Cinnamomum camphora (L.) Presl Coppice Cutting Seedings

n 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. The results are as follows: (1) 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". (2) 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-1 occurred on July 2nd, and the maximum growth rate of biomass is 0.24 g·d-1·plant-1 occurred on August 5th (3) 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, this study shows 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.