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사회과학
자연과학
공학
의약학
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예술체육학
복합학
DBpia AI
AI 에이전트
AI 아이디어
AI 리더
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Citeasy
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초록·키워드
Thinning in hinoki cypress plantation generally increases light, water and nutrient availability for remaining trees. Soil nitrification often increases after thinning. Abundance of understory vegetation also increases. These changes may affect nitrogen use strategy of hinoki cypress and understory vegetation. Deciduous understory vegetation generally has higher leaf nitrogen concentration and their ability to absorb soil nitrogen can prevent nitrogen losses from the ecosystem after thinning. If nitrification increases after thinning, the nitrate should have lower δ¹⁵N value while remaining ammonium should have higher δ¹⁵N. The preferential uptake of nitrate and ammonium should affect δ¹⁵N of plants. Therefore changes of nitrogen utilization by trees can be predicted from their δ¹⁵N values. In this study, we investigated changes of δ¹⁵N in hinoki cypress plantations at two different altitudes (Tengu 1150m, Furumiya 710m) in Shikoku Island, southern Japan. Two adjacent plots (20m x 20m) were located. One plot was thinned in 2002 and the other was remained as a control. Organic layer and surface soil at 5cm depth were samples in 2002. Surface soil at 5 cm depth was collected from 2005-2007 and water content and water extractable ammonium and nitrate were measured. Leaves of hinoki cypress and understory vegetation (Lindera triloba in Tengu and Lindera sericea in Furumiya) were collected in July from 2002-2007. Nitrogen concentration of these samples were measured by NC analyzer while their δ¹⁵N were measured by Isotope Ratio Mass Spectrometry. There were significant difference in soil properties between thinned and control plots. Soil in the thinned plots had higher water content at both areas. Effects of thinning on water extractable ammonium and nitrate were different between high and low altitude ... 전체 초록 보기
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