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首页> 外文期刊>Crop and Pasture Science >Leaf nitrogen and phosphorus levels in macadamias in response to canopy position and light exposure, their potential as leaf-based shading indicators, and implications for diagnostic leaf sampling protocols
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Leaf nitrogen and phosphorus levels in macadamias in response to canopy position and light exposure, their potential as leaf-based shading indicators, and implications for diagnostic leaf sampling protocols

机译：澳洲坚果中的氮和磷水​​平对冠层位置和光照的响应，其作为基于叶片的阴影指示剂的潜力以及对诊断性叶片采样协议的影响

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摘要

The relationships between leaf nutrient content, leaf age, and within-canopy light exposure were studied in 10–11-year-old Macadamia integrifolia cvv. 660, 781, and 344 at Alstonville (28˚59′S, 149˚E), New South Wales, during autumn and spring 1996. Quantum point sensors were placed at 16 positions in the canopy to give mean 24-hourly photosynthetic photon flux density (PFD) readings, which ranged from 13 to 540 mol/m2.sec. At each of these positions, the youngest terminal leaf (YTL), the youngest fully expanded leaf (FEL) from a current flush, and a 6–7-month-old hardened off leaf (HOL) were sampled. In 1997, at 12 sites in the Alstonville district, leaves of cv. 344 were sampled (FEL and HOL) at 5 equidistant positions from the bottom, a height of 1.2 m (position 1), to the top (position 5), on the N–NE side of trees in late spring. The sites varied in canopy density from 50% to 95% ground cover, and PFD from the bottom shaded position to the top exposed position in the canopy across all sites increased by a factor of 1.3 to 17.9.
机译：在10-11岁的澳洲坚果（Macadamia integrifolia）cvv中研究了叶片养分含量，叶片年龄和冠层内部光照之间的关系。 1996年秋季和春季，在新南威尔士州阿尔斯顿维尔（28˚59′S，149˚E）的660、781和344中。将量子点传感器放置在冠层的16个位置上，以提供平均24小时的光合作用光子通量密度（PFD）读数，范围从13到540 mol / m2.sec。在这些位置中的每个位置，均采样了当前冲刷中最年轻的顶生叶（YTL），最年轻的完全展开叶（FEL），以及6-7个月大的变硬叶（HOL）。 1997年，在Alstonville区的12个站点上，简历消失了。在春季晚些时候，在树木的N–NE侧从底部1.2 m（位置1）的高度到顶部（位置5）的5个等距位置采样了344个（FEL和HOL）。这些站点的冠层密度从50％到95％的地面覆盖率不等，并且在所有站点上，从冠层底部阴影位置到顶部暴露位置的PFD都增加了1.3到17.9倍。

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  • 来源
    《Crop and Pasture Science》 |2001年第4期|p.513-522|共10页
  • 作者

    D. O. HuettAFB. J. GogelB N. M. MeyersC C. A. McConchieD L. M. McFadyenA and S. C. MorrisE;

  • 作者单位

    ANSW Agriculture, Tropical Fruit Research Station, PO Box 72, Alstonville, NSW 2477, Australia.BQueensland Department of Primary Industries, Horticulture Institute, Meiers Road, Indooroopilly,Qld 4068, Australia.CSchool of Natural Resource Sciences, Queensland University of Technology, GPO Box 2434, Qld 4001, Australia.DCSIRO Plant Industries, Horticulture Unit, 306 Carmody Road, St Lucia, Qld 4067, Australia.ENSW Agriculture, Wollongbar Agriculture Institute, Bruxner Highway, Wollongbar, NSW 2477, Australia.FCorresponding author;

    e-mail: david.huett@agric.nsw.gov.au;

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  • 正文语种 eng
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  • 关键词

    photosynthetic, photon flux density, leaf age, canopy, shading.;

    机译：光合作用;光子通量密度;叶龄;冠层;阴影。;

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