Chin J Plant Ecol ›› 2022, Vol. 46 ›› Issue (2): 188-196.DOI: 10.17521/cjpe.2021.0165

• Research Articles • Previous Articles     Next Articles

Effects of horizontal structure on canopy vertical structure, microenvironment and yield of Triticum aestivum

XIONG Shu-Ping1, CAO Wen-Bo1, CAO Rui1, ZHANG Zhi-Yong1, FU Xin-Lu1, XU Sai-Jun1, PAN Hu-Qiang1, WANG Xiao-Chun2, MA Xin-Ming1,*()   

  1. 1Key Laboratory of Regulating and Controlling Crop Growth and Development (Ministry of Education), College of Agronomy, Henan Agricultural University, Zhengzhou 450046, China
    2College of Life Science, Henan Agricultural University, Zhengzhou 450002, China
  • Received:2021-04-28 Accepted:2021-08-13 Online:2022-02-20 Published:2021-11-11
  • Contact: MA Xin-Ming
  • Supported by:
    Key Scientific Research Projects of Colleges and Universities in Henan Province(21A210015);Henan Province Modern Agricultural Wheat Industry Technology System Project(S2010-01-G04);National Key R&D Program of China(2016YFD0300205)


Aims Canopy structure of crops is an important factor affecting crop yield. The microenvironment of a community reflects the change of microclimate in the canopy, which is closely related to the canopy structure and crop yield formation. The aim of this study was to optimize the cultivation measures and improve the production potential and yield of winter wheat (Triticum aestivum).

Methods A field experiment was set up to be composed of two row spacing modes, R1 (equal spacing, 20 cm + 20 cm) and R2 (wide and narrow row spacing, 12 cm + 12 cm + 12 cm + 24 cm), and three sowing rates, D1 (low, 120.0 kg·hm-2), D2 (medium, 157.5 kg·hm-2), D3 (high, 195.0 kg·hm-2), then the canopy structure, community microenvironment and yield performance of winter wheat under each treatment combination were analyzed.

Important findings For the diffusenon-interceptance (DIFN), mean leaf angle (MLA) and leaf area index (LAI) of each layer of the winter wheat canopy, R2 was greater than R1, especially in the middle and upper layers of the canopy. For the MLA and LAI of each layer, R2 was mostly significantly greater than R1; Under the same row spacing, the LAI of the high seeding population dropped rapidly, and LAI of the D2 seeding rate and the middle and lower MLA were significantly higher than the other seeding rates at D2. Winter wheat canopy temperature and community CO2 concentration decreased with the increased sowing rate, while the relative humidity increased with the increased sowing rate; Under the same sowing rate, the row spacing of R2 had more cooling and moisturizing ability than that of R1. The average temperature and relative humidity of the overall canopy decreased by 0.06-0.5 °C and increased by 1.85%-3.15% compared with R1, respectively. Under the same sowing rate, the 1 000 grain weight and grain number per spike of R2 were significantly higher than that of R1, so the grain yield of R2 was also significantly higher than that of R1. In conclusion, the horizontal distribution of crops can change the vertical structure of canopy and community microenvironment, which is conducive to grain filling in the late growth stage, and increase the number of grains per year and 1 000 grain mass without reducing the number of spikes, so as to achieve the purpose of increasing yield. In this experiment, R2D2was the best configuration for canopy structure, community microenvironment and yield.

Key words: Triticum aestivum, horizontal distribution, vertical structure of canopy, microenvironment, yield