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국내연구정보 (Domestic information) |
| ▒ Home | > | | 연구정보 (Information) | > | 국내연구정보 (Domestic information) |
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| Cone Number and Thinning on Nutrient Content in Needles |
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| 글쓴이 : 관리자
날짜 : 09-01-31 12:02
조회 : 10832
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Effects of Cone Number and Thinning on Nutrient Content in Needles of Korean Pine (Pinus koraiensis) <Jour. Kor. For. Soc. 97(5):516-524 2008> Corresponding author Sim-Hee Han simhee02@forest.go.kr
To understand the physiological effects of alternate bearing, the distribution of nutrient contents (N, P, and K) in current and one-year-old needles of Korean pine was investigated. 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, P concentration in needle 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.
Key words: Korean pine, alternate bearing, cone number, cone thinning, macronutrient
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