不同配比施肥对马尾松幼苗生长特征的影响

为获得马尾松幼苗最佳施肥配方，该文以1年生马尾松幼苗为试验材料，采用L₁₆（4³）正交设计，并通过测定幼苗苗高、地径、生物量、叶绿素含量、叶片N、P、K含量，探讨不同N、P、K配比施肥对马尾松幼苗生长特征影响。结果表明：（1）不同配比施肥处理间马尾松幼苗苗高、地径、生物量、质量指数、叶绿素和养分含量存在显著差异，其中，处理12生物量、质量指数、叶绿素a和总叶绿素含量、隶属值最高。（2）施N对幼苗生长及生理指标均有极显著影响；施K对苗高、地径、地上生物量、总生物量有显著影响，对叶绿素和针叶养分有极显著影响；施P对叶绿素a、叶绿素b、针叶N和P含量有极显著影响，对苗高、地下生物量、总叶绿素含量有显著影响。（3）施N对苗高、地径、地上生物量、总生物量、质量指数、叶绿素a含量、总叶绿素含量和针叶N含量的影响最大，K次之，P最小。各因素对地下生物量和针叶P含量的影响均表现为N>P>K。（4）N3水平利于幼苗苗高地径的生长及生物量的积累，N4水平利于叶绿素a和总叶绿素含量及针叶N、P含量的积累，P4水平利于生物量、叶绿素含量和养分P含量的积累...

Effects of different fertilization ratios on growth characteristics of Pinus massoniana seedlings

In order to obtain the optimal fertilization formula for Pinus massoniana seedlings, one-year-old seedlings were selected and grown in a L₁₆(4³)orthogonal design. Traits, such as seedling height, ground diameter, biomass, leaf chlorophyll contents and N, P, K contents, were measured to explore the effects of different N, P, K fertilization ratios on growth characteristics. The results were as follows:(1)There were significant differences in seedling height, ground diameter, biomass, quality index, chlorophyll and nutrient contents among different fertilization ratios treatments. Among them, treatment 12 had the highest biomass, quality index, chlorophyll a and total chlorophyll contents, and membership value.(2)N application had extremely significant effects on growth and physiology; K application had significant effects on seedling height, ground diameter, above-ground biomass, total biomass, and had extremely significant effects on chlorophyll and needle nutrients; Besides, P application had extremely significant effects on chlorophyll a, chlorophyll b, N and P contents in needles, and had significant effects on seedling height, under-ground biomass and total chlorophyll content.(3)N application had greater effect on seedling height, ground diameter, above-ground biomass, total biomass, quality index, chlorophyll a, total chlorophyll and N contents in needles than K and P applications. The effects on under-ground biomass and P contents of needles were as N>P>K.(4)N3 level was beneficial to seedling height, diameter and biomass accumulation. N4 level was beneficial to the accumulation of chlorophyll a and total chlorophyll contents, N and P contents in needles, while P4 level was beneficial to biomass accumulation, chlorophyll and P contents accumulation. Comprehensive analysis showed that N should be applied mainly in the early stage of P. massoniana seedlings, supplemented by P and K. N3P4K2 nutrient solution can improve the overall quality of seedlings, with N, P and K concentrations as 8.25, 1.00 and 1.50 mmol·L^-1, respectively.