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Chinese Journal of Applied Ecology ›› 2017, Vol. 28 ›› Issue (3): 789-796.doi: 10.13287/j.1001-9332.201703.004

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Effects of shading in summer and autumn on physiological and biochemical characteristics of ‘Huangjinya’ in Shandong Province, China

TIAN Yue-yue, ZHANG Li-xia*, ZHANG Zheng-qun, QIAO Ming-ming, FAN Yan-gen   

  1. College of Horticulture Science and Engineering, Shandong Agricultural University/Tai’an Tea Engineering and Technological Research Center, Tai’an 271018, Shandong, China
  • Received:2016-07-19 Published:2017-03-18
  • Contact: *E-mail: zlx_sdau@163.com
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (31501651), the Shandong Natural Science Foundation (ZR2015CQ017), and the Key Technology Integration Research and Industrialization Demonstration in Ecological Tea Garden in Tai’an (201340629)

Abstract: In order to ensure the suitable shade model for ‘Huangjinya’ tea plant in Shandong Province, black or blue shading net at 55%, 70% or 85% shading rates was selected to recover tea garden in summer and autumn, then micro-climate of tea garden, leaf color, chlorophyll fluorescence parameters, growth status and biochemical composition of tea shoots were investigated.The results showed that compared with the control, light intensity and air temperature in tea garden, leaf temperature of tea plants in different shading treatments significantly decreased, while air humidity in tea garden increased. The contents of chlorophyll in the tea leaves were obviously increased with increasing the shading rate, which resulted in the leaf color becoming green. The yellowing characteristics and biochemical quality of ‘Huangjinya’ tea plants could be well kept in 55% shading treatments. In 70% shading treatments, ‘Huangjinya’ tea plants had better growth situation and higher yield with no photo-inhibition. Compared with the blue shading treatments, black shading treatments could obviously promote the growth of ‘Huangjinya’ tea plants, keep yellowing characteristics, and improve the quality. Therefore, the 70% black shading treatment (daily PAR values of 1.2-3.5 ten thousand lx) was appropriate for promoting the growth of ‘Huangjinya’ tea plants at the seedling stage. For mature tea plants, the 55% black shading treatment (daily PAR values of 1.8-5.5 ten thousand lx) could be used to keep the yellowing characteristics and to improve biochemical quality effectively, so as to give full play to its variety characteristics, to achieve goal of high quality and high yield.