Araucaria cunninghamii Seedling Response to Different Forms and Rates of 15N-Labelled Fertiliser

T.J.BLUMFIELD; XU Zhi-Hong

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Araucaria cunninghamii Seedling Response to Different Forms and Rates of 15N-Labelled Fertiliser

机译：南洋杉苗对15N肥料的不同形态和用量的响应

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Nitrogenous fertilisers are under consideration for promoting the growth of nursery-reared hoop pine (Araucaria cunninghamii Aiton ex A. Cunn) seedlings in the establishment phase of second rotation (2R) plantations. Using 15Nlabelled fertilisers, we investigated the effect of different forms (ammonium sulphate, ammonium nitrate, potassium nitrate and urea) and rates of application (0, 150 and 300 mg N kg-1 dried soil) of fertilisers on the growth, 15N recovery and carbon isotope composition (δ13C) of hoop pine seedlings in a 12-month glasshouse trial in southeast Queensland,Australia. The 15N-labelled fertilisers were applied to nursery-reared hoop pine seedlings, which were then grown in pots,containing ca. 1.2 kg dried soil, under well watered conditions for 12 months. Four seedlings from each treatment were harvested at 4-month intervals, divided into roots, stem and foliage, with a further subdivision for new and old foliage,and then analysed for 15N, total N, δ13C and total C. There was no significant response in the seedling growth to the form or rate of application of nitrogen (N) fertiliser within the 12-month period, indicating that the seedlings did not experience N deficiency when grown on second rotation hoop pine soils. While the combined 15N recovery from soil and plant remained at around 70% throughout the experiment, the proportion of 15N recovered from the plants increasing steadily over time. Nitrate containing fertilisers at 150 mg N kg-1 soil gradually increased seedling foliage δ13C over the 12-month period, indicating an increase in seedling water use efficiency.

机译：在第二轮（2R）人工林的建立阶段，正在考虑使用氮肥来促进苗圃生长的环松（Araucaria cunninghamii Aiton A. Cunn）幼苗的生长。我们使用15 N标记的肥料，研究了不同形式的肥料（硫酸铵，硝酸铵，硝酸钾和尿素）以及肥料的施用量（0、150和300 mg N kg-1干燥土壤）对生长，15N回收和氮肥的影响。在澳大利亚昆士兰州东南部进行的为期12个月的温室试验中，箍松树幼苗的碳同位素组成（δ13C）。将15N标记的肥料施用于苗圃育成的箍松树苗，然后将其种植在盆中。 1.2千克干燥的土壤，在充分灌溉的条件下放置12个月。每种处理以4个月的间隔收获四棵幼苗，分为根，茎和叶，再分为新叶和旧叶，然后分析15N，总氮，δ13C和总C。无显着响应在12个月内，幼苗生长达到了氮（N）肥料的施用形式或施肥速率，这表明在第二轮箍松土壤上生长的幼苗没有遇到氮素缺乏的情况。在整个实验中，从土壤和植物中回收的15N总量保持在70％左右，而从植物中回收的15N的比例则随着时间的推移稳定增加。 150 mg N kg-1的土壤中含有硝酸盐的肥料在12个月内逐渐增加了幼苗的叶片δ13C，表明幼苗的水分利用效率有所提高。

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《土壤圈（英文版）》 |2006年第6期|745-755|共11页
作者
T.J.BLUMFIELD; XU Zhi-Hong;
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作者单位

Centre for Forestry and Horticultural Research, Nathan Campus, Griffith University, 170 Kessels Road, Nathan, Queensland 4111 (Australia);

Faculty of Environmental Sciences, Griffith University, Nathan Campus, Griffith University,170 Kessels Road,Nathan,Queensland 4111(Australia);

Centre for Forestry and Horticultural Research, Nathan Campus, Griffith University, 170 Kessels Road, Nathan, Queensland 4111 (Australia);

Faculty of Environmental Sciences, Griffith University, Nathan Campus, Griffith University,170 Kessels Road,Nathan,Queensland 4111(Australia);

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收录信息中国科学引文数据库(CSCD);
原文格式 PDF
正文语种 chi
中图分类农业基础科学;
关键词
hoop pine, 15N recovery, nitrogen, water use efficiency;

机译：箍松;15N回收;氮;水分利用效率;

Araucaria cunninghamii Seedling Response to Different Forms and Rates of 15N-Labelled Fertiliser

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