Journal of Korean Society of Forest Science (한국산림과학회지)

Korean Society of Forest Science (한국산림과학회)
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Effects of Cone Number and Thinning on Nutrient Content in Needles of Korean Pine (Pinus koraiensis)

  • Han, Sim-Hee (Forest Seed Research Center, Korea Forest Research Institute) ;
  • Kim, In-Sik (Forest Seed Research Center, Korea Forest Research Institute) ;
  • Kim, Hyun-Suk (Forest Seed Research Center, Korea Forest Research Institute) ;
  • Kim, Tae-Su (Forest Seed Research Center, Korea Forest Research Institute) ;
  • Jang, Kyung Hwan (Forest Seed Research Center, Korea Forest Research Institute) ;
  • Kim, Tae Dong (College of Forest and Environmental Sciences, Kangwon National University)
  • Received : 2008.06.17
  • Accepted : 2008.06.26
  • Published : 2008.10.31
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Abstract

We investigated on the distribution of nutrient contents (N. P and K) in current and one-year old needles of Korean pine, Pinus koraiensis, to understand the physiological effects of alternate bearing. One experimental set was designed with three types of cone number (one, three and five) under natural state and cone number of another one was controlled by thinning. Test samples were separated to collect into three fractions; current needles on the shoot and one-year old needles above and under the cone. On the branch without cone, N, P and K concentrations in needles on the shoot were higher than those in needles of one-year old branch. At natural state, needle P concentration was the lowest in needles on the five-cone branch in August. Macronutrient concentrations were the lowest in needles above the cone, which was remarkably observed in needle K concentration. Under cone thinning, N. P and K concentrations were the highest in needles on one-cone branch and the lowest in needles on five-cone branch. Needle nutrient concentrations were the lowest in needles above the cone, which was remarkably observed in the needle on five-cone branch. In conclusion, the current needles of the shoot and cones are a strong sink of nutrient like N. P and K, and the increase of cone number influences nutrient removal from needles.

Keywords

References

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