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Bulletin of Botanical Research ›› 2019, Vol. 39 ›› Issue (5): 733-739.doi: 10.7525/j.issn.1673-5102.2019.05.012

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Effects of Different Improvement Measures on Soil Structure and Element Composition,Photosynthesis and Growth of Poplar Leaves in Severe Saline-alkali Soils of Songnen Plain

LI Zhan-Jun1,2, ZHANG Hou-Liang1, GUO Xing1, FAN Rui-Hong1, MA Ke1, LIU Ji-Yun1, YANG Feng-Jian2   

  1. 1. Yichun Academy of Forestry, Yichun 153000;
    2. Key Laboratory of Forest Plant Ecology, Ministry of Education, Northeast Forestry University, Harbin 150040
  • Received:2019-03-05 Online:2019-09-05 Published:2019-07-16
  • Supported by:
    Special Fund for Forest Scientific Research in the Public Welfare(201104002-3)

Abstract: The long-term effect of the improvement of severe saline-alkali soil was still controversial, in this research, in order to improve soil, poplar plantations were planted in different ways in Songnen Plain. The soil environment, photosynthetic process and growth status of poplar were systematically studied. The internal structure of soil structure in severe saline-alkali soil was more uniform, and the looseness, barrier, void, ventilation, permeability and specific surface area were all improved. The elements content of C and Fe in the soil increased by 29.7% and 13.9%, respectively, and the content of Na decreased by 82.4% on average. Therefore, soil colloid cohesion soil fertility was enhanced, and soil salinization was slowed down. The growth rates of photosynthetic rate, respiratory rate, height, DBH, branch number, branch length and crown diameter of poplar were 328%-381%, 98%-153%, 23.8%, 35.3%, 160%, 100%, and 73.5%, and the root growth of the improved Bar foraging ditch was the best. This research has a positive significance for basic data support for biological improvement of degraded saline-alkali soil in Songnen Plain.

Key words: severe saline-alkali soil, soil element, photosynthesis, soil structure, growth conditions

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