Korean Journal of Soil Science and Fertilizer (한국토양비료학회지)

Korean Society of Soil Science and Fertilizer (한국토양비료학회)
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Effects of Soil Water Potential on the Moisture Injury of Rubus coreanus Miq. and Soil Properties

토양수분퍼텐셜이 복분자 습해와 토양특성에 미치는 영향

  • Ahn, Byung-Koo (Jeollabuk-do Agricultural Research and Extension Services) ;
  • Kim, Kab-Cheol (Jeollabuk-do Agricultural Research and Extension Services) ;
  • Kim, Dae-Hyanf (Jeollabuk-do Agricultural Research and Extension Services) ;
  • Lee, Jin-Ho (Department of Bioenvironmental Chemistry, Chonbuk National University)
  • Received : 2011.03.15
  • Accepted : 2011.04.14
  • Published : 2011.04.30
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Abstract

This study was conducted to examine the impacts of different soil water potentials on environmental soil properties related to the moisture injury of Korean raspberry (Rubus coreanus Miq.). Soil water potential in the plastic film house plots was differentiated from -5 to -40 kPa. Soils in the plots contained 5.6% of plant available water. Increasing soil water contents based on the changes in water potential increased soil pH and exchangeable $Ca^{2+}$ content and decreased exchangeable $K^+$ and total N contents. It also declined soil organic matter content at 9 days after water treatments. Relationship between water potential and soil water content was given as an exponential equation, y = 96.534 - 20.28In(x). In particular, when the water potential was higher than -20 kPa (27.5% of soil moisture content), it decreased chlorophyll content in the raspberry leaves, inhibited N uptake by the plant, and increased phosphorus content with increasing days after water treatment. Also, as the 7 days after water treatment at higher than -20 kPa of water potential, the root activity of the plant was significantly decreased, and trunk (top)/root (T/R) ratio of the plant markedly declined until 9 days after water supply. Carbohydrate contents in the raspberry plant leaves and roots at dormant stage were the lowest at -5 and -10 kPa of water potential plots, and it may cause winter injury to the plant.

토양수분포텐셜이 복분자 생육에 미치는 영향을 조사하기 위하여 복분자 시설하우스에서 -5 ~ -40 kPa 수준으로 토양수분을 처리하였다. 시설하우스내의 토양유효수분은 5.6%이었고, 수분포텐셜에 따라 토양수분함량이 높아지면 토양 pH와 치환성 Ca은 증가하였고, 치환성 K와 전질소 함량은 감소하였으며, 유기물함량은 수분처리 9일 이후부터 감소하였다. 수분포텐셜과 토양수분함량 간에는 y = 96.534 - 20.28In(x)의 지수함수 근사식이 성립되었다. 수분포텐셜이 -20 kPa (토양 수분 27.5%) 이상이면 복분자 잎의 엽록소 함량이 감소하였고 질소흡수가 억제되며, P 함량은 수분공급 시간에 따라 증가하였다. 수분포텐셜 -20 kPa 이상의 수준으로 7일 이상이 경과하면 뿌리활력이 급격히 감소되어 생육이 위축되었다. 지상부에 대한 뿌리비율 (T/R률)은 수분공급 9일까지 급격히 감소하였다. 휴면기의 복분자 줄기와 뿌리의 탄수화물 함량은 -5 kPa과 -10 kPa 처리구에서 가장 낮아 동해 위험도가 가장 높았다.

Keywords

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