Journal of Korean Society of Forest Science (한국산림과학회지)

Korean Society of Forest Science (한국산림과학회)
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Effects of Soil Amendments on Survival Rate and Growth of Populus sibirica and Ulmus pumila Seedlings in a Semi-arid Region, Mongolia

몽골 반건조 지역에서 토양 개량이 백양나무와 비술나무 묘목의 활착 및 생장에 미치는 영향

  • Jung, Yegi (Department of Environmental Science and Ecological Engineering, Korea University) ;
  • Yoon, Tae Kyung (Department of environmental science and engineering, Ewha Womans University) ;
  • Han, Saerom (Department of Environmental Science and Ecological Engineering, Korea University) ;
  • Kang, Hoduck (Department of Biological and Environmental Science, Dongguk University) ;
  • Yi, Myong-Jong (Department of Forest Resources, Kangwon National University) ;
  • Son, Yowhan (Department of Environmental Science and Ecological Engineering, Korea University)
  • 정예지 (고려대학교 환경생태공학과) ;
  • 윤태경 (이화여자대학교 환경공학과) ;
  • 한새롬 (고려대학교 환경생태공학과) ;
  • 강호덕 (동국대학교 바이오환경과학과) ;
  • 이명종 (강원대학교 산림자원학과) ;
  • 손요환 (고려대학교 환경생태공학과)
  • Received : 2014.06.03
  • Accepted : 2014.08.18
  • Published : 2014.12.31
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Abstract

This study was conducted to investigate effects of soil amendments on survival rate and growth of seedlings in a semi-arid region, Mongolia. 2-year-old Populus sibirica and Ulmus pumila seedlings were planted in alkaline sandy soils and treated with 2 levels of nitrogen, elemental sulfur, artificial moisture retention and converted loess. After 4 months, the seedling survival rate of both species decreased as the amount of nitrogen increased. Nitrogen has been generally known to increase seedling survival rate and growth by supplying nutrients, however, reduced survival rate in this study might be affected by consequential increase in soil osmotic pressure, which was caused by excessive nitrogen fertilization. The root collar diameter (RCD) growth of both species increased significantly by the treatment of converted loess, and only RCD growth of P. sibirica increased by the artificial moisture retention treatment. Although P. sibirica is drought-tolerant, it is in the group of Populus spp. which requires a high capacity of available water. Conversely, the elemental sulfur treatment showed no effect on survival rate and RCD growth for both species due to the low oxidation of sulfur in arid soils. The extended monitoring of seedling growth and soil characteristics is required to elucidate the long-term effects of soil amendments in the semi-arid region, and the further studies are also needed to examine the appropriate amount of fertilizers for both species.

본 연구는 몽골 반건조 지역 현지에서 토양 개량이 묘목의 활착 및 생장에 미치는 효과를 알아보기 위해 수행되었다. 이를 위하여 알칼리성 사질 토양인 연구대상지에 2년생 백양나무(Populus sibirica)와 비술나무(Ulmus pumila) 묘목을 심고 질소(시비량에 따라 2수준), 황, 인공보습제, 황토가공소재 등을 처리하였다. 4개월 뒤, 두 수종의 묘목 활착률은 질소 시비량의 증가에 따라 감소하였다. 일반적으로 질소의 시비는 양분을 공급하여 묘목의 활착률 및 생장을 높이는 것으로 알려져 있다. 그러나 본 연구 결과에서 나타난 활착률 감소는 과다시비로 인한 토양 삼투압의 증가에 의한 것으로 보인다. 두 수종 모두 황토가공물질 처리구에서 근원경 생장에 유의한 증가가 나타났다. 그리고 백양나무의 경우 인공보습제 처리구에서도 근원경 생장이 유의하게 증가하였는데, 이는 백양나무가 건조에 내성이 있음에도 불구하고 수분 요구도가 높은 포플러속에 속하기 때문인 것으로 보인다. 반면 황 처리는 두 수종의 활착률과 근원경 생장 모두에서 효과가 없는 경향이 나타났는데, 이는 건조지 토양의 낮은 황산화율 때문으로 추정된다. 향후 건조/반건조 지역에서 토양 개량의 장기적인 효과를 알아보기 위하여 묘목 생장 및 토양 특성에 대한 지속적인 모니터링이 요구되며, 연구 수종에 적합한 시비량 산정을 위한 추가 연구가 필요한 것으로 판단된다.

Keywords

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