不同遗传控制和经营措施对杉木人工林早期生长的效应分析

Genetic and Management Effects on the Early Growth of Chinese Fir Plantation

为构建南岭山区杉木Cunninghamia lanceolata大径材高效培育技术体系,提高南岭山区杉木大径材产量与质量,对杉木新造林大径材高效培育试验在3年生时林分生长情况作分析。结果表明:杉木树高、胸径和单株材积在不同品系间存在较显著或极显著差异,在南岭山区培育杉木大径材应选择无性系T-c07、2.5代种子园种;不同种植密度间林分生长总体上不存在显著差异,随着株行距增大树高和单位面积蓄积总体上逐渐减少,胸径和单株材积逐渐增大,南岭山区杉木大径材培育宜采用株行距2 m×2 m、2 m×3 m、4 m×3 m;施肥对林分生长有明显促进作用,不同施肥处理间树高、胸径、单株材积存在不同程度差异,氮磷双因素效应和氮、磷单因素两类拟合与最优用量分析结果表明,大径材培育新造林试验地对氮肥需要处于中等偏下水平,而对于磷肥的需求处于中等偏上的水平。采用优良品种配以合理施肥等培育措施对幼林生长具有显著的促进效果。

In order to construct the high-efficient cultivation technology system of large-diameter timber of Cunninghamia lanceolata in Nanling mountain area and improve the yield and quality of large-diameter timber of C. lanceolata in Nanling mountain area, the high-efficient cultivation test of large-diameter timber of new afforestation of C. lanceolata at the age of 3 years was analyzed. The results showed that there were significant or extremely significant differences in tree height, DBH and volume per plant among different lines in genetic control test. Clonal T-c07 and 2.5-generation seed orchard seeds should be selected to cultivate large-diameter wood of Chinese fir in Nanling mountain area. The density control test showed that there was no significant difference in the overall stand growth among different planting densities. With the increase of plant row spacing,tree height and unit area volume gradually decreased, while DBH and single plant volume gradually increased.For large-diameter Chinese fir in Nanling mountain, plant row spacing should be 2 m×2 m, 2 m×3 m, 4 m×3m. "3414" control precision fertilization experiment, fertilizer has obvious promoting effect to the stand growth,different fertilizer treatments tree height, DBH, individual volume exists between different degree of difference,nitrogen and phosphorus two-factor single factor two types of nitrogen and phosphorus effect and fitting and analysis results show that the optimum amount, the afforestation of big diameter wood to foster new testbed for nitrogen need to be at below average level, the demand for phosphate fertilizer is above the average level. The results showed that the adoption of good variety with reasonable fertilization and other cultivation measures had significant promoting effect on the growth of young forest.