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Chinese Journal of Applied Ecology ›› 2021, Vol. 32 ›› Issue (4): 1345-1351.doi: 10.13287/j.1001-9332.202104.030

• Original Articles • Previous Articles     Next Articles

Effects of reduced solar radiation on photosynthetic physiological characteristics and accumulation of secondary and micro elements in paddy rice.

FANG Xiao-kun1,2, CHEN Zhi-wei1, CHENG Zhao-kang1, JIANG Hai-bo3, QIU Dan3, LUO Xiao-san1*   

  1. 1Department of Agricultural Resources and Environment, School of Applied Meteorology, Nanjing University of Information Science and Technology/Jiangsu Key Laboratory of Agricultural Meteorology, Nanjing 210044, China;
    2Quanzhou Meteorological Bureau, Quanzhou 362000, Fujian, China;
    3Jiangsu Farmland Quality and Agricultural Environmental Protection Station, Nanjing 210036, China
  • Received:2020-10-21 Accepted:2021-01-25 Published:2021-10-25
  • Contact: *E-mail: xsluo@nuist.edu.cn
  • Supported by:
    National Natural Science Foundation of China (41471418).

Abstract: Atmospheric haze pollution is a popular environmental issue in recent years. The aerosols reduce solar radiation reaching land surface, with consequences on the growth of crops. In order to examine the effects of low solar radiation intensity on the physiological characteristics and mineral nutrition of grain crops, the random designed field experiment of rice cultivar ‘Nanjing 5055’ planted under different shading degrees (CK, natural sunlight control; Y1 and Y2 were treatments with shading rates of 19% and 45%, respectively) were conducted. The response of chlorophyll content (SPAD), leaf area index (LAI), net photosynthetic rate of leaves, grain yields and secondary/micro element contents (Ca, Mg, Fe, Zn, Mn, Cu) in rice were measured during key growth stages (jointing, heading, and grain filling stages). Results showed that, shading treatments inhibited the synthesis of photosynthetic products and reduced the LAI during the whole growing period, but at the early stage it did not affect the chlorophyll content, which was significantly increased at the late growth stage. Compared with CK, the 1000-grain weight of rice was decreased by 14.4% and 18.4%, and seed setting rate was decreased by 4.3% and 12.9%, which resulted in rice yield reduction. With the increases of shading rates, rice yield was decreased by 58.5% and 66.4%, respectively. The nutrient concentrations, especially for the micro-elements, in brown rice and glume were increased. Shading had a negative effect on rice growth, which would eventually reduce the crop production. The higher contents of heavy metals such as Cu and Mn would be a pollution risk for human health. Therefore, the impacts of weakened solar radiation on quantity and quality of crops need comprehensive evaluation.

Key words: crops, aerosol pollution, photosynthesis, mineral element, heavy metal, staple food quality and safety