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Regulating effect of row spacing on the population of late-sowing winter wheat.

XUE Ying-wen1,2, WANG Zhi-min1, ZHANG Ying-hua1**   

  1. (1College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China; 2College of Agronomy, Heilongjiang Bayi Agricultural University, Daqing 163319, Heilongjiang, China)
  • Online:2015-11-10 Published:2015-11-10

Abstract: In order to investigate the effect of row spacing on the population of late-sowing winter wheat, a widely planted cultivar, Jimai 22, was sown with row spacing at 12, 20, and 30 cm (denoted as J12, J20 and J30, respectively) during 2011-2013. Canopy structure and environmental factors under the canopy, individual plant traits and their variations, yield and yield components were analyzed. The results showed that the population’s leaf area index in treatment J12 increased significantly during the late growth stage, the light intercept increased significantly and the loss of light leakage decreased apparently. Compared with J20 and J30 treatments, within J12 population the maximum temperature decreased by 0.9 and 2.5 ℃, and the relative humidity increased by 0.3% and 0.9%, respectively. The variation of individual plant traits in J12 treatment decreased, spike length and spikelet number increased significantly, and the variation of grain yield per spike decreased, which increased the stability of the population yield, and increased the grain yield by 7.8%-24.5%, compared with J20 and J30. It was concluded that narrow row spacing (12 cm) benefited the grain yield of late-sowing winter wheat in the areas with water shortage in the North China Plain.

Key words: airborne LiDAR, single laser penetration index, leaf area index (LAI), laser beam splitting, intensity normalization