한국남부지역 덜꿩나무 자생지의 식생구조 및 토양특성
Vegetation Structure and Soil Conditions of Viburnum erosum Habitats in the Southern Region of Korea
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남부지역 덜꿩나무 집단 중 우점도가 높은 6개 지역을 대상으로 식생구조 및 토양특성을 분석하여 조경용으로서 가치가 높은 덜꿩나무 자생지의 생육환경을 파악하여 생육 적지는 선정하는데 기초자료를제공하고자 수행하였다. 자생지 내의 목본식물은 교목층 13수종, 아교목층 38수종, 관목층 48수종으로총 68수종이 분포하였다. 평균상대우점치(MIV)가 높은 수종은 소나무, 굴참나무, 생강나무, 산벚나무,땅비싸리, 당단풍나무, 진달래, 정금나무, 작살나무 등이었으며, 전 조사지역에서 공통적으로 출현한 수종은 졸참나무와 때죽나무 2수종이었다. 덜꿩나무와 유사한 생태적 지위를 갖는 정의 상관관계를 나타내는 수종들은 자귀나무와 노린재나무 2수종으로 나타난 반면 굴피나무는 부의 상관관계가 있어 서로생태적 지위가 이질적인 것으로 나타났다. 자생지의 종다양도(H’), 최대종다양도(H’max), 균재도(J’)및 우점도(1-J’)는 각각 0.887, 1.102, 0.803, 0.196으로 나타났다. 자생지의 토양특성은 pH 4.3, 유기물함량 10.6%, 전질소함량 0.34% 및 유효인산 0.68㎎ ㎏-1로 나타났으며, 치환성양이온은 Ca2+(16.84 cmolc ㎏-1) > K+(6.41 cmolc ㎏-1) > Mg2+(4.26 cmolc ㎏-1) 순으로 높은 함량을 나타냈다. 남부지역 덜꿩나무 집단은 유기물 함량이 풍부하고 양이온 치환용량이 높은 강산성 토양으로 질소의 함량에 비해 인산의 함량이 다소 높은 곳에서 자라는 경향이 있었다.
Abstract
We conducted this study to investigate vegetation structure and soil conditions of sixViburnum erosum Thunb.(V. erosum) populations which showed high dominance. A total of 68woody plants were observed to distribute: 13 in tree layer; 38 in subtree layer; and 48 in shrublayer. Based on the Mean Importance Value(MIV), the dominant tree species in the V. erosumpopulations were as follows in order of: Acer pseudosieboldianum(Pax) Kom., Callicarpajaponica Thunb., Indigofera kirilowii Maxim. ex Palib., Lindera obtusiloba Blume, Prunussargentii Rehder, Quercus variabilis Blume, Rhododendron mucronulatum Turcz. and Vacciniumoldhamii Miq. In paticular, the species observed in all of the study sites were Quercus serrataMurray and Styrax japonicus Siebold & Zucc. It was found that the presence of V. erosum waspositively correlated with that of Albizia julibrissin Durazz. and Symplocos chinensis f. pilosa(Nakai) Ohwi, while negatively correlated with that of Platycarya strobilacea Siebold & Zucc. According to the result, means of species diversity(H’), maxim species diversity(H’ max), evenness(J’) and dominance(1-J’) were measured at 0.887, 1.102, 0.803, and 0.196, respectively. The soil conditions properties of pH value, organic matter content, total nitrogen content, andthe amount of available phosphorous indices in the study sites were 4.3, 10.6%, 0.34% and 0.68㎎·㎏-1, respectively. Meanwhile, the total amount of exchangeable cations of Ca2+, K+, andMg2+ were 16.84cmolc·㎏-1, 6.41cmolc·㎏-1, and 4.26cmolc·㎏-1, respectively. Overall, Viburnumerosum Thunb. populations tend to grow in the strongly acid soil, which has great abundance ofsoil organic matters, a lot of exchangeable cations, and has higher amount available phosphorousthan that of nitrogen.
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