施肥对长白落叶松苗木养分库氮磷吸收及利用的影响

为探讨传统施肥量是否使出圃长白落叶松苗木体内养分达剑养分奢养阶段,以长白落叶松1年生播种苗为实验材料,设定不同施肥量实验,对2年生移栽苗木的生物量、N和P的养分浓度及含量进行检验,并结合养分吸收利用效率和N、P的矢量情况进行分析.结果表明:2种施肥量处理对其养分库和全株的生物量(P<,养分库>=0.028 5;P<,全...

Effects of fertilization on uptake and availability of N and P nutrient pool of Larix olgensis seedlings

In order to explore luxury nutrient uptake of the seedlings prior to field planting under conventional fertilizing regimes, Larix olgensis seedlings(one-year old) were selected as materials. Biomass, concentrations and contents of N and P of two-year old seedlings were tested under different fertilization treatments. The nutrient use efficiency and vector nomogram of N and P were also analyzed. The results show that the amount of fertilizer significantly affected the biomass(Ppool=0.028 5; Pintact=0.032 5), P concentration(Ppool=0.002 2; Pintact=0.041 8) and P content(Ppool=0.004 3; Pintact=0.030 1). Biomass and nitrogen transferring to nutrient pool occurred with low values of nutrient use efficiency. Vector analysis indicated that N deficiency and P in dilution status were observed in both nutrient pool and intact seedlings. In order to induce luxury nutrient uptake of seedlings, fertilization regimes should be optimized by conducting both exponential N nutrient loading during growth period and fertilization of P in late-season. Simultaneously, nutrient pool strength could be selected as an indicator for seedling performance after planting.