Arid Zone Research ›› 2021, Vol. 38 ›› Issue (1): 275-282.doi: 10.13866/j.azr.2021.01.29

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Analysis of canopy light interception and dry matter distribution characteristics of different winter wheat yield groups in Xinjiang

WANG Lihong1,2(),ZHANG Hongzhi1,2,LI Jianfeng1,2,WANG Zhong1,2,GAO Xin1,2,SHI Jia1,2,ZHANG Yueqiang1,2,FAN Zheru1,2,ZHAO Qi1,2()   

  1. 1. Institute of Nuclear Technology and Biotechnology, Xinjiang Academy of Agricultural Sciences, Urumqi 830091, Xinjiang, China
    2. Key Laboratory of Oasis-Desert Crop Physiology Ecology and Cultivation of Ministry of Agricultural and Rural Affairs, Urumqi 830091, Xinjiang, China
  • Received:2020-05-26 Revised:2020-08-07 Online:2021-01-15 Published:2021-03-05
  • Contact: Qi ZHAO E-mail:1498877605@qq.com;zhaoqi@xaas.ac.cn

Abstract:

The effects of photosynthetically active radiation (PAR) interception, dry matter distribution, and the yield of winter wheat at different yield levels were studied to provide a theoretical basis for narrowing the yield gap, improving the utilization of light energy resources, and high-yield cultivation of winter wheat in the Xinjiang province. This experiment was conducted in Junhu and Qitai regions from 2018 to 2019. The main varieties planted in the region were used as experimental materials, and the integrated management model was adopted to simulate the four yield levels, namely, super high (SH: ≥9000 kg·hm-2), high (HH: 7500-9000 kg·hm-2), peasant household (FP: 6000-7500 kg·hm-2), and basic yields (CK: ≤4500 kg·hm-2). The characteristics of light interception, dry matter accumulation, and distribution in the upper, middle, and lower canopies of winter wheat at the four yield levels were studied, and the correlation between them and yield composition was analyzed to explore ways of increasing yield. The results showed that the population with a high-yield level could still maintain a high leaf-area index (LAI) during its grouting stage. With production level increased, PAR interception rate and volume in the upper, middle, and lower layers of the canopy all increased, and the overall performance was greater in the upper than in the middle layer, presenting a vertical distribution characteristic of “strong at the top and weak at the bottom.” The variation trend of PAR transmittance was opposite. Dry matter accumulation in the middle layer was lower than in the upper and lower layers, and dry matter increase in the upper layer was greater than in the middle and lower layers, with an increase in yield level. The dry matter accumulation in the upper, middle, and lower layers was significantly correlated with the PAR interception rate, and the correlation coefficient with grain yield was 0.97, 0.90, and 0.78, respectively. Therefore, maintaining high LAI, increasing PAR interception, and increasing dry matter accumulation after flowering are approaches to achieving increased wheat yield and reduced yield difference.

Key words: winter wheat, photosynthetically active radiation, light interception, dry matter, yield, Xinjiang