种植密度对豫北太行山区连翘生长和产量的影响

Effects of Planting Density on Growth and Yield of Forsythia suspensa in the Taihang Mountain Area of Northern Henan Province

摘要:

为探究种植密度对连翘产量的影响，对豫北太行山区4种种植密度（T₁：3 333株/hm²，T₂：2 500株/hm²，T₃：2 000株/hm²，T₄：1 667株/hm²）的连翘林进行抽样调查，观测冠幅、株高、地径等生长指标及单株产量与单位面积产量，采用SPSS 26.0进行统计分析。结果表明，低密度T₄、T₃处理能够增加冠幅、增粗地径、控制株高，增加单株产量。单位面积产量随密度下降呈先升后降的趋势，T₃处理（密度2 000株/hm²）产量最高，达到3 192.0 kg/hm²，显著高于其他处理。T₃处理实现了个体生长与群体数量的平衡，为豫北太行山区连翘最佳种植密度。生产中可依据土壤肥力、地形等条件调整密度，肥沃地块可采用1 667株/hm²，贫瘠山地可采用2 500株/hm²。

Abstract:

To explore the effect of planting density on the yield of Forsythia suspensa, a sample survey was conducted on four planting densities (T₁: 3 333 plants/ha, T₂: 2 500 plants/ha, T₃: 2 000 plants/ha, T₄: 1 667 plants/ha) of Forsythia suspensa forest in Taihang Mountain area of northern Henan Province. Growth indicators including crown width, plant height, diameter and yield per plant and unit area were observed, and SPSS 26.0 was used for statistical analysis. The results showed that low-density T₄ and T₃ could increase crown width, thicken stem diameter, control plant height and increase yield per plant. The yield per unit area increased first and then decreased with the decrease of density. The yield of T₃ (2 000 plants/ha) was the highest, reaching 3 192.0 kg/ha, which was significantly higher than that of other treatments. Treatment T₃ achieved the balance between individual growth and population number, which was the best planting density for Forsythia suspensa in Taihang Mountain area of northern Henan. The density can be adjusted according to soil fertility, topography and other conditions in the production. The fertile land can be used 1 667 plants/ha, and the barren mountain can be used 2 500 plants/ha.