施肥对长白落叶松苗木养分库氮磷吸收及利用的影响
Effects of fertilization on uptake and availability of N and P nutrient pool of Larix olgensis seedlings.
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摘要: 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到养分奢养阶段，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全株=0.032 5）、P的养分浓度（P养分库=0.002 2; P全株=0.041 8）及P的含量（P养分库=0.004 3; P全株=0.030 1）影响显著，且存在生物量和N素向养分库转移的现象，养分吸收利用参数值均较低。矢量分析结果显示，整株和养分库中N素均处于养分缺乏状态，而P素处于养分稀释状态。建议生产部门对其传统施肥方式进行转变，对其生长季中指数施N肥和晚季追施P肥，以使苗木达到奢养的阶段，同时利用苗木养分库的大小来预测苗木造林的表现。Abstract: 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.
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Keywords:
- Larix olgensis /
- nutrient loading /
- nutrient pool /
- N /
- P
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期刊类型引用(5)
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