不同氮素浓度与空间条件下青萍生长特征

以西部地区优势浮萍品种青萍为实验对象,研究了它在不同总氮(TN)初始浓度和空间条件下的生长特征。结果表明,在表面积为95 cm2,TN初始浓度为0、1、2、3 mg/L的条件下,青萍的生长能较好地服从经典生长模型,对数生长阶段的相对生长速率(RGR)随TN浓度的增长而线性增长,分别为0.10、0.11、0.13、0.13 d-1。在TN浓度为10 mg/L,表面积为95、130和230 cm2的条件下,青萍的生长能较好地服从Logistic生长模型,其环境最大承载量和对数生长阶段的RGR分别为1 899、2 101和1 962 g/m2以及0.21、0.21和0.20 d-1。

Growth characteristics of Lemna minor L. under different nitrogen concentrations and space conditions

As an advantage variety of duckweeds in the western region, L. minor was used to study its growth characteristics under different initial total nitrogen (TN) concentrations and space conditions. Results showed that when cultured with 95 cm² surface area and 0, 1, 2 and 3 mg/L of initial TN concentrations, the growth of L. minor could be well illustrated with the classic growth model. The relative growth rates (RGR) increased with the TN concentrations increasing, reaching to 0.10, 0.11, 0.13 and 0.13 d^-1, respectively. In contrast, the growth of L. minor could be well illustrated with the Logistic growth model, when cultured with 10 mg/L TN and 95, 130 and 230 cm² surface areas. The environmental carrying capacities were 1 899, 2 101 and 1 962 g/m², respectively, where the RGR in logarithmic growth phase were 0.21, 0.21 and 0.20 d^-1.