不同栽植密度对斑叶稠李苗木培育质量的影响

以斑叶稠李（Padus maackii）1年生苗木为研究对象，通过4种不同栽植密度（60、80、100、120 株·m^-2）试验，测定其苗木形态、生物量、光合速率及养分含量，旨在探明不同密度对斑叶稠李苗木生长及养分含量的影响，为其高质量苗木培育提供理论依据。结果表明：（1）栽植密度显著影响苗木生物量，各密度下苗木根、茎、叶生物量由大到小顺序均为80 株·m^-2 > 60 株·m^-2 > 100 株·m^-2 > 120 株·m^-2；60和80 株·m^-2密度下斑叶稠李苗木质量指数显著高于100和120 株·m^-2密度处理。（2）栽植密度显著影响苗木侧根数，在80 株·m^-2的密度下达到最大；（3）80 株·m^-2密度较其它密度显著提高了苗木氮、磷、钾养分含量。（4）叶生物量、根生物量和侧根数与苗木各质量指标间Pearson相关性系数均达到了显著水平（P<0.1），而光合速率和主根长与苗木各质量指标均不相关（P>0.1）。综合以上结果，斑叶稠李1年生苗木最适栽植密度为80 株·m^-2，且密度处理主要影响斑叶稠李苗木叶生物量、侧根数及根生物量指标，进而影响苗木质量。

Effects of Different Planting Densities on Cultivating Quality of Padus maackii Seedlings

We studied the growth and nutrient content of the one-year-old Padus maackii seedlings, which provided a theoretical basis for the field cultivation. The morphology, biomass, photosynthetic rate and nutrient content of the seedlings were determined under four planting densities, including 60, 80, 100 and 120 ind.·m^-2. (1)The biomass was affected significantly in different planting densities. The order of leaf, stem and root biomass of P.maackii seedlings in different planting densities were 80 > 60 > 100 > 120 ind.·m^-2, respectively. The quality index of P.maackii seedlings at the density of 60 and 80 ind·m^-2 were significantly higher than that at the density of 100 and 120 ind.·m^-2. (2)The number of lateral roots were affected significantly under different density treatments, which was maximum at the density of 80 ind.·m^-2. (3)The nutrient content of N, P, K were highest under 80 ind.·m^-2 density treatment, and were significantly higher than that in other treatments. (4)The seedling quality indexes were significantly positively correlated with the leaf biomass, root biomass and lateral root number(P<0.1), but were not correlated with the taproot length and photosynthetic rate(P>0.1). Thus the optimal seedling density of one-year-old P.maackii was 80 ind.·m^-2, and the leaf biomass, lateral root number and root biomass of P.maackii were affected significantly by planting densities, then affected the seedling quality.