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Changes in Tree Growth and Soil Environment Following Biochar Application in Urban Green Spaces

  • Journal of Environmental Impact Assessment
  • Abbr : J EIA
  • 2025, 34(4), pp.209~222
  • Publisher : Korean Society Of Environmental Impact Assessment
  • Research Area : Engineering > Environmental Engineering
  • Received : April 28, 2025
  • Accepted : August 4, 2025
  • Published : August 31, 2025

SeongHun Lee 1 HakKoo Kim ORD ID 1 YunKyung Lim 2 GyeongWon Kwon· 3 YuGyeong Hwang 1 JungHun Pi· 1 ChanBeom Kim 1

1한국수목원정원관리원
2한국수목원정원관리원 국립세종수목원 정원도시숲부
3한국수목원정원관리원 국립세종수목원 정원도시숲본부

Accredited

ABSTRACT

Biocharis necessary in various aspects such as responding to climate change using carbonsequestration and improving plant growth through soil improvement. In agriculture, biocharresearchis being conducted to increase crop growth, but research targeting trees is rare. Therefore, this studymonitored and analyzed changes in soil environment and tree growth according to biochartreatment(16 kg/m2, 4 kg/m2, 0 kg/m2) of Zelkova serrata growing in green areas in residential areas. From July2023 to March 2025, soil moisture, soil temperature, and electrical conductivity data for each treatmentarea were acquired, soil physicochemical analysis was performed, and the diameter at breast height,root diameter, and tree height of Zelkova serrata were measured. The monitoring results showed thatsoil moisture and electrical conductivity were statistically significant in the soil environment, and the16 kg treatment area had significantly higher waterretention capacity and electrical conductivity thanothertreatment areas. In soil physicochemical analysis, cation exchange capacity, organic matter, totalnitrogen, and total carbon showed statistical significance. In tree growth, statistical significance wasshown in the diameter at breast height, and the 4 kg treatment showed the highest growth rate(24.55%), while the 16 kg treatment showed the lowest growth rate (19.46%). As a result of confirmingthe correlation, it was confirmed that the higherthe soil moisture and electrical conductivity, the moreunfavorable it was for the growth of the diameter at breast height. This study revealed that excessivebiochar application (16 kg/m2) can actually inhibit tree growth and identified the optimal applicationdose (4 kg/m2) for soil carbon storage capacity and Zelkova serrata growth. This will serve as valuablebaseline data for developing effective biochar application strategies for creating and managing greenspaces in residential areas

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