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水和肥是促进毛白杨速生高产的两大重要因素,研究水肥耦合效应对毛白杨苗木的生物量影响具有重要的现实意义.本文以毛白杨杂种无性系87号嫁接苗为试材,采用水、氮、磷三因素五水平二次回归通用旋转组合设计,于2008年3—10月在北京林业大学苗圃进行盆栽试验,研究了不同水肥耦合水平对毛白杨苗木生物量的影响,并建立了毛白杨生物量的水肥耦合回归模型.结果表明:土壤水分是影响毛白杨生物量的主要因素,其次为氮肥和磷肥.随着三者投入量的增加,毛白杨生物量增加;当三者增加到一定程度时,继续投入则使其生物量下降.土壤水分与氮肥交互作用显著,且有较好的正效应;而氮肥与磷肥、土壤水分与磷肥交互作用不明显.经模型寻优,水肥调控的最佳组合为:土壤水分控制在田间持水量的73.37%,氮肥和磷肥的施用量分别为4.14和1.41 g.plant-1;此时的毛白杨苗木生物量达到68.30 g.plant-1.
Water and fertilizer are two important factors to promote fast-growing and high-yielding Populus tomentosa and it is of great practical significance to study the effect of water and fertilizer coupling on the biomass of Populus tomentosa seedlings.In this paper, the 87 hybrid poplar clone clones were used as materials, , Nitrogen and phosphorus five levels quadratic regression general rotation combination design, from March to October 2008 in Beijing Forestry University nursery pot experiments to study the coupling of different water and fertilizer levels of Populus tomentosa seedling biomass, and established Populus tomentosa biomass-water-fertilizer coupling regression model.The results showed that: Soil moisture was the main factor affecting Populus tomentosa biomass, followed by nitrogen and phosphate fertilizer.With the three inputs increased, Populus tomentosa biomass increased; To a certain extent, continue to put its biomass decreased. Soil moisture and nitrogen interaction significantly, and has a positive effect; and nitrogen and phosphorus, soil moisture and phosphorus interaction is not obvious. Optimized by the model, water and fertilizer The best combination of regulation was: soil water control was 73.37% of field capacity, nitrogen and phosphate fertilizer application rates were 4.14 and 1.41 g.plant-1 respectively; at this time, Populus tomentosa seedlings Was reached 68.30 g.plant-1.