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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.
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,서금영,김래현,구진우,이명종,김지홍 한국산림과학회 2005 Forest Science And Technology Vol.1 No.1
This study was conducted to estimate the biomass and nutrient distribution in understory P. koraiensis seedlings invading a mixed forest dominated by Quercus mongolica in central Korea. Total above and belowground biomass for the three overstory and understory dominant tree species were 2.70 t/ha for P. koraiensis, 210.56 t/ha for Q. mongolica, and 28.39 t/ha for Q. variabilis. P. koraiensis seedlings seemed to allocate more biomass to foliage (31.0% of total biomass) than overstory Quercus spp. (0.9%), so as to exploit the low light flux found in the shady conditions. Furthermore, the high specific leaf area of P. koraiensis seedlings indicated morphological characteristics of shade leaves in low light conditions. Total nitrogen (N) and phosphorus (P) contents for P. koraiensis seedlings and Quercus spp. were 19.6 and 1.9 kg/ha, and 94.7-626.5 and 9.4-137.6 kg/ha, respectively. Our results suggested that understory P. koraiensis seedlings exerted only a minor influence on the biomass and nutrient distribution for the study forest.
대기오염과 산림생태계 : Ⅰ. 산성강하물이 산림토양에 미치는 영향 Ⅰ. Effects of Acid Deposition on Forest Soils
손요환 高麗大學校自然資源科學硏究所 1994 自然資源科學硏究 Vol.2 No.-
A definitive understanding of acid deposition effects on forest soils clearly has not been achieved. However, impacts on forest soil properties most likely to occur include soil acidification, increased mobilization of heavy metals including aluminum, changes in mineral weathering rates, increased rates of cation leaching, altered soil biology, and changes in nitrogen cycling. What appears to be needed is the expansion of current efforts to investigate and to monitor, on a long-term basis, the elemental fluxes which take place in various conditions. Recommended research directions will help narrow the degree of uncertainty.
손요환,김성준,윤태경,한새롬,한승현,이종열,김춘식,이상태,서경원,양아람 한국산림과학회 2015 Forest Science And Technology Vol.11 No.3
Thinning can affect soil carbon (C) and base cation balances by reducing tree density and altering microclimate and organic matter budget; however, the subsequent changes in soil C and base cation contents after thinning are not well elucidated. Thus, this study investigated the effects of thinning on C storages in soil (at 010 cm, 1020 cm, and 2030 cm depths) and forest floor and concentrations of soil exchangeable base cations (Ca2C , Mg2C , K C , and Na C ). Thinning treatments of different intensities based on the removed basal area (no thinning: control, 15% thinning: T15, and 30% thinning: T30) were applied to a naturally regenerated 31 to 40-year-old Quercus spp. forest. Soil C concentrations at 1020 cm and 2030 cm depths were significantly higher in T15 and T30 than in the control after 39 months, but not after 4 months. T15 and T30 treatments seemed to increase soil C storage at 030 cm after 39 months, but did not significantly change forest floor C storage after 4 and 39 months. Concentrations of exchangeable K C of T15 and exchangeable base cations except for Ca2C of T30 depth were significantly lower than those of the control at 010 cm after 4 months, but not after 39 months. This study shows that thinning treatments on a naturally regenerated Quercus spp. forest could increase soil C concentration after a few years but temporally decrease concentrations of soil exchangeable base cations.