关键词: 极值, 极值

Abstract:

To understand the effect of different phosphorus concentration on root morphology and acid phosphotase activity in Phyllostachys praecox. The effects of phosphorus concentrations, e.g. 0, 0.5, 5, 50, 500 mg/L, on root morphology and acid phosphotase activity of one-year old Phyllostachys praecox were investigated by potted sand experiment. The results showed that with phosphorus concentration increasing, root/shoot ratio of Phyllostachys praecox decreased gradually. Addition of phosphorus to promote on the accumulation of organic matter, thereby dropped the value of root shoot ratio.0.5 mg/L of phosphorus concentration, root length reached a maximum value of 1344.76 cm/plant. Root surface area and root volume reached the maximum as 384.28 cm2/plant and 11.67 cm3/plant respectively in 0 mg/L of treatment. In the range of 0 to 5 mg/L of P concentration, acid phosphotase (Apase) activities in the leaf and root decreased gradually. They were maximum as 14.44 μmol/(g?min) and 11.46μmol/(g?min) respectively, when incubated under 0 mg/L of P concentration. These suggested morphological change and acid phosphatase activity enhancement induced by a P deficiency could be an adaptive response of Phyllostachys praecox to low phosphorus.