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국내연구정보 (Domestic information) |
| ▒ Home | > | | 연구정보 (Information) | > | 국내연구정보 (Domestic information) |
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| Total Nitrogen Distribution and Seasonal Changes in Inorganic Nitrogen |
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| 글쓴이 : 관리자
날짜 : 08-07-14 14:04
조회 : 9300
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Total Nitrogen Distribution and Seasonal Changes in Inorganic Nitrogen at a Pinus koraiensis Stand in Kwangju-gun, Kyunggi-do, Korea <Jour. Kor. For. Soc. 69:56-68 1985> Senior author KECOLOGY@forest.go.kr <KECOLOGY@forest.go.kr>
This study was conducted (1) to measure the nitrogen content of various parts of trees in a 24-year-old plantation, providing a harvest method with the least impact on the self-serving mechanisms in the nitrogen status of the ecosystem and (2) to examine the seasonal changes in inorganic nitrogen (ammonium salt and nitrate, separately) at various soil depths and to study the self-serving mechanisms for nitrogen at the ecosystem, providing an appropriate method and season for the application of nitrogen fertilizers. The results obtained in this study were as follows; 1) Of the total nitrogen content of the total tree biomass (except for roots), nearly 61.5% was distributed in the needles, 20% in the branches, 5.5% in the stem bark, and 13% in the stem wood. Therefore, the harvest method of removing only wood parts for pulpwood production has little impact on the self-serving mechanisms of the site's nitrogen status. 2) Inorganic nitrogen concentrations decreased with increasing soil depths. The seasonal average concentration of inorganic nitrogen was highest in early spring and decreased in the following descending order, autumn, followed by mid-summer, and early summer. This pattern resulted from the fact that the loss of nitrate was greatly influenced by environmental factors. Thus, it was suggested that an application of active nitrogen fertilizer would be appropriate in spring.
Key words: Pinus koraiensis, total nitrogen distribution, self-serving mechanism, inorganic nitrogen, ammonium salt, nitrate nitrogen
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