氮磷钾钙配施对望天树幼苗生长及生理特性的影响

Effects of Combined Application of Nitrogen,Phosphorus,Potassium,and Calcium on the Growth and Physiological Characteristics of Parashorea chinensis Seedlings

探讨不同N、P、K、Ca配施处理对望天树幼苗生长及生理特性的影响,并根据其生长及生理表现筛选适宜的配施处理,旨在为望天树壮苗培育提供参考依据。以1年生望天树幼苗为试验材料,采用L16(4~4)正交试验设计方法。结果表明,不同配施处理对望天树幼苗生长及生理指标影响达到极显著差异水平(P<0.01),生长表现最优处理是N_2P_2K_4Ca_1和N_3P_4K_2Ca_1,生理指标表现最优处理是N_3P_2K_1Ca_2和N_3P_4K_2Ca_1。相关性分析表明望天树苗高与叶片叶绿素、可溶性糖和可溶性蛋白质含量等生理指标呈极显著正相关,与丙二醛含量呈极显著负相关,地径仅与叶绿素含量呈显著正相关关系。处理7(100 mg N+20 mg P+80 mg K)、处理12(200 mg N+40 mg P+20 mg K)对望天树幼苗生长的促进作用最大,处理11(200 mg N+20 mg P+50 mg Ca)和处理12(200 mg N+40 mg P+20 mg K)配施下生理特性指标表现最好;N是望天树幼苗生长的必须因子,P和K对促进苗木地径生长作用显著,适量Ca有助于提高望天树幼苗生理活性,超过100 mg则导致生理胁迫。

To explore the effects of combined application of N,P,K,and Ca on the growth and physiological characteristics of Parashorea chinensis seedlings to screen out the optimal application formula,to provide a technical reference for the seedling cultivation.One-year-old P.chinensis seedlings were used as materials,an orthogonal experiment with the design of L16(44)was adopted.Extremely significant differences(P<0.01)in the seedling growth and physiological characteristics were found among different combinations.Treatments N2P2K4Ca1 and N3P4K2Ca1 were favorable to seedling growth,and N3P2K1Ca2 and N3P4K2 Ca1 were beneficial for physiological characteristics.The growth of the seedling height was most significantly and positively correlated with the contents of chlorophyll,soluble sugar,soluble protein in leaves,and most significantly and negatively correlated with malondialdehyde content.Significantly positive correlation was also found between the growth of ground diameter and chlorophyll content.Treatment No.7(100 mg N+20 mg P+80 mg K)and treatment No.12(200 mg N+40 mg P+20 mg K)were the best combinations for the seedling growth,the treatment No.11(200 mg N+20 mg P+50 mg Ca)and No.12(200 mg N+40 mg P+20 mg K)were best to physiological characteristics.Nitrogen was the essential factor for seedling growth,while P and K were beneficial to the growth of ground diameter.The addition of proper amount of calcium could promote the physiology activity of the seedlings,but excessive calcium may lead to stress.