指数施肥对杉木第3代种子园实生容器苗生长影响

Effects of Exponential Fertilization on the Growth of Seed Container Seedlings in the Third Generation Seed Orchard of Cunninghamia lanceolata

为提高造林前的苗木质量,以杉木(Cunninghamia lanceolata)第3代种子园轻型基质容器苗为研究对象,采用6种不同大量元素水溶肥处理,包含2种常规施肥和3种指数施肥,其中常规施肥包含等量施肥(C60)和1次性施肥(H60),指数施肥包含3个处理(即30 mg/株,E30、60 mg/株,E60、120 mg/株,E120),另设对照(CK)。每种施肥处理供试苗木300株,每间隔2周施肥一次,总施肥10次。分别在施肥期间的第10周、第20周和第38周(造林前1天)取苗木测定苗木苗高、地径和生物量,分析杉木容器苗生长和生物量变化动态。研究结果表明:相对对照处理,各种施肥均显著促进了杉木容器苗的苗高、地径和生物量。综合生产成本和对环境的影响以指数施肥60 mg/株,E60处理为最佳,该处理下9个月生杉木容器苗的苗高、地径和生物量分别为30.39 cm、5.37 mm和4.95 g,与对照(CK)相比增长了23.84%、40.58%和55.66%。

In order to improve the quality of seedlings before afforestation,the light matrix container seedlings of the third generation seed orchard of Cunninghamia lanceolata were studied,six kinds of watersoluble fertilizers with different large amounts of elements were used,including two kinds of conventional fertilization and three kinds of index fertilization.The conventional fertilization included equal amount fertilization(C60)and one-time fertilization(H60),exponential fertilization includes three treatments(That is 30 mg/plant,E30、60 mg/plan,E60、120 mg/plan,E120),another control(CK).300 seedlings were tested for each fertilizer.Fertilizer was applied at every 2 weeksand was totally conducted 10 times.Seedling height,basal diameter and biomass was measured at 10,20 and 38 weeks(one day before afforestation)during fertilization.The results show that:relative control treatment,all kinds of fertilization significantly promoted the seedling height,ground diameter and biomass of container seedlings of C.lanceolata.Considering the overall production cost and environmental impact,exponential fertilization for E60 has best performance,the height,diameter and biomass of container seedlings of 9-month-old Chinese fir were 30.39 cm,5.37 mm and 4.95 g,respectively which increased by 23.84%,40.58%and 55.66%compared with CK。