Canopy Structure and Light Distribution in Winter Wheat

doi:10.3321/j.issn:1000-7091.1996.01.010

Abstract

Abstract: The study was carried out at the experimental bases of Nanjing Agricultural University set up in Shuyang County,Jiangsu province and Weigang,Nanjing,respectively. The relative height for the maximum leaf area density aM(z)in the canopy reduced from booting to anthesis and then increased with the advance of development and the increment of nitrogen fertilizer. The leaf area index (LAI)affected the vertical distribution of leaf area and light attenuation through the canopy. This could be reflected by the vertical distribution of light extinction coefficient(K). At low LAI canopies,the relative height of a_M(z) was lower and the vertical distribution of K was even. At high LAIs canopies,the relative height of a_M(z) was higher and the K value was greater in the canopys upper parts than that in the middle parts. Under high-yielding conditions the maximum LAI was about 6.0一7.5, the vertical distribution of leaf area was symmetry to the canopys middle layer and K was lower in the upper parts.

Key words: Wheat, Canopy structure, Light distribution, Leaf angle

CLC Number:

S512.101

Zhang Yanmin, Li Jinsheng. Canopy Structure and Light Distribution in Winter Wheat[J]. ACTA AGRICULTURAE BOREALI-SINICA, 1996, 11(1): 54-58. doi: 10.3321/j.issn:1000-7091.1996.01.010.

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