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Chinese Journal of Applied Ecology ›› 2020, Vol. 31 ›› Issue (9): 3101-3110.doi: 10.13287/j.1001-9332.202009.006

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Effects of biochar and EM application on growth and photosynthetic characteristics of Sesbania cannabina in saline-alkali soil of the Yellow River Delta, China

CUI Qian, XIA Jiang-bao*, LIU Jing-tao, YANG Hong-jun, PENG Ling   

  1. Shandong Key Laboratory of Eco-Environmental Science for the Yellow River Delta, Binzhou University, Binzhou 256603, Shandong, China
  • Received:2020-03-18 Accepted:2020-07-02 Online:2020-09-15 Published:2021-03-15
  • Contact: * E-mail: xiajb@163.com
  • Supported by:
    the National Key Research and Development Program of China (2017YFC0505904), the Natural Science Foundation of Shandong Province (ZR2019PD012), the Open Project of Shangdong Key Laboratory of Coastal Environmental Processes, Yantai Inistitute of Coastal Zone Research, Chinese Academy of Sciences (2019SDHADKFJJ10), the Youth Innovation Support Program of Shangdong Universities (2019KJD010), and the Taishan Scholar Program of Shangdong Province, China.

Abstract: We examined the effects of biochar and effective mircoorganisms (EM) application on growth and photosynthetic characteristics of Sesbania cannabina in the Yellow River Delta, by a pot experiment with different EM treatments (without EM addition, EM-; with EM addition, EM+) and a gradient of biochar treatments (0, B0; 0.5%, B1; 1.5%, B2; 3%, B3; biochar weight/soil weight). The growth parameters, photosynthetic light response curve and chlorophyll fluorescence characteristics of S. cannabina were measured. The results showed that the EM+B3 treatment had the best effect among all the treatments. Compared with the EM-B0 treatment, the EM+B3 treatment increased height, stem diameter, and total biomass by 69.5%, 90.0% and 141.1%, respectively. Biochar and EM significantly improved photosynthetic capacity. Compared with the EM-B0 treatment, the EM+B3 treatment significantly enhanced the maximum light response of net photosynthetic rate, transpiration rate, water use efficiency, and stomatal conductance by 93.8%, 35.1%, 43.4%, and 34.8%, respectively. Biochar and EM improved the parameters of chlorophyll fluorescence. Compared with the EM-B0 treatment, the EM+B3 treatment significantly increased the potential photochemical efficiency, the actual photochemical efficiency, the apparent electron transport rate and the non-photochemical quenching coefficient by 25.8%, 31.5%, 37.2%, and 56.8%, respectively. The parameters of growth, photosynthesis and chlorophyll fluorescence increased with the increasing biochar under EM+ treatments, whereas the B3 treatment had negative effect under EM- treatments. The co-addition of EM and 3% biochar (EM+B3) could improve the photosynthetic capacity and chlorophyll fluorescence characteristics of S. cannabina, broaden light ecological amplitude, boost the water retention and drought resistance property, and promote the growth of S. cannabina.

Key words: biochar, effective mircoorganisms, Sesbania cannabina, photosynthetic characteristics, chlorophyll fluorescence parameter