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일본잎갈나무 , 잣나무 , 신갈나무 임분 토양의 층위별 토양수의 화학적 특성
손요환,류성렬 한국환경농학회 1998 한국환경농학회지 Vol.17 No.4
Soil solutions were collected by zero-tension lysimeters at Kwangju, Kyunggi Province to estimate differences in ion concentration among species and horizons. Zero-tension lysimeters were installed in O, A, and B horizons in Larix leptolepis, Pinus koraiensis, and Quercus mongolica stands. Soil solution samples were collected from September 1996 through August 1998 and analyzed for K^+, Na^+, NH₄^+, Mg^(2+), Ca^(2+), Al^(3+), Cl^-, SO₄^(2-), NO₃^-, and PO₄^(3-). The experimental site had high nitrogen loading from the atmosphere, and N03 was positively correlated with K^+ and Mg^(2+). However, N03^- and NH₄^+ showed a positive correlation only in the O horizon of Q. mongolica stand. Mg^(2+) deficit in the soil was predicted owing to the positive relationship of Mg^(2+) with NO₃^-. Concentrations of K^+ and Ca^(2+) in soil solution were estimated higher in L. leptolepis than in other stands because of high leaching from the plant. Concentration of Al^(3+) in soil solution was negatively correlated with soil solution pH. Mean soil solution pH of A and B horizons in P. koraiensis was lower than 4.7, however the Al^(3+) concentration was lower than the toxic level to plants.
이온교환수지봉지를 이용한 일본잎갈나무 간벌지의 질소 유효도 측정
손요환,김현섭 한국환경농학회 2000 한국환경농학회지 Vol.19 No.2
We explored changes in soil nitrogen (N) availability in a thinned (control, light, moderate, and heavy thinning) Larix leptolepis plantation determined by using ion exchange resin bags. Nitrogen availability varied among measurement periods, however, total available N (ammonium plus nitrate) concentrations did not change significantly in the 1 year since thinning. We found higher N availability in summer and fall than in winter.
손요환,이윤영,김래현,서경원,반지연,서금영,구진우,경지현,노남진 한국생태학회 2004 Journal of Ecology and Environment Vol.27 No.6
Photosyntheticaly active radiation (PAR) beneath the forest canopy, understory species richnessand diversity, and biomass were measured in a Larix leptolepis plantation seven years after thinning in 1997. The current PAR values were lower than those measured four years after thining, and PAR at the heavy thinning plots was significantly higher than that of other thining intensities. A total of 23 species including 9 tal-trees and 14 shrubs were found for the high layer while a total of 82 species including 10 tal-tres, 29 shrubs, and 43 herbs for the low layer. Species richness and diversity generaly increased with thinning intensities, and the trends were more evident for the low layer. Aboveground biomass significantly difered among thining intensities for both shrubs and herbs. Also there was a negative correlation between biomass and the current forest floor, species richness and diversity and production of understory vegetation continued seven years after the treatment.
손요환,김동엽,박인협,이명종,진현오,한상균 한국산림과학회 2002 한국임학회 학술발표논문집 Vol.2002 No.-
N/A N/A
손요환 高麗大學校自然資源科學硏究所 1997 自然資源科學硏究 Vol.5 No.-
Long-term ecological research is receiving more attention now than ever before, and there is a growing interest to expand ecological research both temporally and spatially. This paper described the importance and approaches of long-term ecological research, which gives us basic understandings of ecosystems to manage natural resources and environments properly. Also the value and attributes of long-term monitoring in ecosystems were explained.
은행나무 묘목에 대한 시비가 생장 및 엽내 양분과 유용 추출물 농도에 미치는 영향
손요환,김진수,황재홍,박정수 ( Yo Whan Son,Zin Suh Kim,Jae Hong Hwang,Jung Soo Park ) 한국산림과학회 1998 한국산림과학회지 Vol.87 No.1
We measured seedling growth, foliar nutrient and extract concentrations of 3-year-old Ginkgo biloba seedlings growing in a nursery following a single fertilization with nitrogen (N), phosphorus (P) and nitrogen plus phosphorus (N+P) fertilizers. Fertilization did not change foliage, stem and root biomass of the seedlings except for the high N+P treatment, Foliar N and P concentrations following fertilization varied according to the amount of fertilizers. In general, foliar N and P concentrations increased with fertilization, but fertilization with 400㎏ N/㏊ and 100㎏ P/㏊ decreased foliar N and P concentrations, respectively. Seedling growth and foliar nutrient concentrations showed that N and P were the growth-limiting nutrients in our study site. It was found that fertilization reduced the concentrations of secondary metabolites (Ginkgo flavon glycosides and terpene lactones) in foliages. It seemed there was a relationship between foliage biomass production and secondary chemicals in G. biloba seedlings.
손요환,김진수 한국생태학회 1997 Journal of Ecology and Environment Vol.20 No.3
Forest managers are increasingly being challenged to produce goods and services to society while managing for ecosystem sustainability. Forest ecosystem management is an emerging philosophy to achieve these objectives. We synthesized some basic concepts of forest ecosystem, sustainability in forests and forest ecosystem management, and described the importances of long-term ecological studies. Also we presented few relatively simple principles of forest ecosystem management, strategies, and case studies for integrating forest ecosystem management principles into the forest management planning process. It was emphasizd that in forest ecosystem management process, society, land managers, forest managers, and scientists be entered into a partnership to reshape management goals, redefine objectives, and redirect management actions in response to changing socioeconomic information and evolving bioogical, physical, chemical, and environmental conditions. Agreement or disagreement with our synthesis and opinions on forest ecosystem management is out of the primary objective of this paper, which is to stimulate new and creative approaches to forest ecosystem management as an emerging issue in forestry.