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천연림과 인공림에서의 고로쇠나무 생장 및 수액 채취 가능 연수 추정
윤준혁,배은지,진언주,성창현 경상국립대학교 농업생명과학연구원 2020 농업생명과학연구 Vol.54 No.4
This study was conducted to estimate the age of Acer pictum subsp. mono at which profits can be generated by producing and collecting its sap through the selection of growth and development factors and forest management related to the planting density of the trees at the time of the establishment of artificial afforestation by comparatively analyzing the growth characteristics and development environment of Acer pictum subsp. mono in natural and artificial forests. The soil characteristics for each stand type displayed higher contents of organic matter, total nitrogen, and available phosphate in overall in the natural forest in comparison to the artificial forest. The linear regression equation was formulated by using diameter at breast height, width of crown, and crown area with a high level of statistical significance in the natural and artificial forests. The diameter at breast height and width of crown in the natural forest were found to be y=0.1708x+2.972 (R2=0.5996) and y=0.2275x+2.5195 (R2=0.4024) in the artificial forest, while the diameter at breast height and crown area in the natural forest were found to be y=1.1504x-1.665 (R2=0.6406) and y=1.0084x+1.123 (R2=0.4589) in the artificial forest. Annual growths and developments for each stand type were 2.4mm and 3.8mm in the natural forest and the artificial forest, respectively, thereby illustrating statistically significant differences with approximately 1.6 times higher levels in the artificial forest (p<0.0001). Annual growth and development rates in the initial 5 and 10 years for each stand type were also analyzed to be higher in the artificial forest. As the result of the growth and development of diameter at breast height in accordance with the annual increase in the natural forest and the artificial forest, the ages taken to reach 10cm in the diameter at breast height were 22 and 13 years, respectively, for the natural forest and the artificial forest. It is deemed that these results can be utilized as basic data for the analysis of profitability in the forest management as well as in the prediction of the growth and development in the establishment of Acer pictum subsp. mono resources and at the time of substitute renewal afforestation. 본 연구는 고로쇠나무에 대해 천연림과 인공림에서의 생육환경과 생장특성을 비교ㆍ분석하여 인공조림 시 식재밀도에 관련하는 생장인자의선정과 산림경영을 통해 수액을 생산하여 소득을 얻을 수 있는 연수를 추정하기 위해 수행되었다. 임분 유형별 토양특성은 천연림에서 인공림에비해 유기물함량, 전질소, 유효인산이 전반적으로 높게 나타났다. 천연림과 인공림에서 통계적 유의성이 높은 흉고직경과 수관폭, 수관면적을 이용하여 선형회귀식을 산출하였다. 흉고직경과 수관폭은 천연림에서 y = 0.1708x + 2.972(R2=0.5996), 인공림에서 y = 0.2275x + 2.5195(R2 = 0.4024) 로 나타났다. 흉고직경과 수관면적은 천연림에서 y = 1.1504x - 1.665(R2 = 0.6406), 인공림에서 y = 1.0084x + 1.123(R2 = 0.4589)로 나타났다. 임분 유형별로 연평균생장량은 천연림에서 2.4mm, 인공림에서 3.8mm로 통계적으로 유의한 차이를 보이며 인공림에서 약 1.6배 더 높게 나타났다(p < 0.0001). 임분별 초기 5년과 10년 동안의 연륜생장량 또한 인공림에서 높게 분석되었다. 천연림과 인공림에서 연륜 증가에 따른 흉고직경 생장을조사해 본 결과 흉고직경 10㎝ 크기로 도달되는 연수는 천연림은 22년, 인공림에서는 13년이 소요되는 것으로 분석되었다. 이와 같은 결과는고로쇠나무의 자원조성 및 대체갱신 조림 시 식재 후 생장 예측과 산림경영을 위한 수익성 분석의 기초 자료로 활용할 수 있을 것으로 판단된다.
윤준혁,김태형,김상율 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
Poly(N-vinylamine) (PVAm) is a hydrophilic polymer having a large number of primary amine groups which can be utilized for various applications; hydrogen bond-reinforced polymer gels, CO₂/pH-responsive polymers, ion exchange membranes, and others. However, only few studies have been reported for the synthesis of PVAm block copolymers. Here, we synthesize dual pH-responsive polymer poly(4-hydroxystyrene)-b-poly(N-vinylamine) (PHS-b-PVAm) by Reversible Addition Fragmentation Chain-Transfer (RAFT) polymerization. 4-Acetoxystyrene and N-vinylformamide monomers were used to synthesize precursor polymers, poly(4-acetoxystyrene)- b-poly(Nvinylformamide) (PAcOS-b-PNVF), by using ‘Switchable’ RAFT agent, and then the precursor polymers were deprotected through hydrolysis. Detailed synthesis and the property of PVAm block copolymers will be presented.
윤준혁,권수덕,전권석,강정희,조민기,문현식 경상대학교 농업생명과학연구원 2012 농업생명과학연구 Vol.46 No.1
This study was undertaken to analyze 1) the growth characteristics for the optimal planting density and 2) reached ages of sap tapping for the planting timing of Acer okamotoanum in natural and plantation stand. Soil in natural stand was significantly more fertile than that of plantation stand. Early growth of A. okamotoanum in plantation stand was affected by planting density. Results showed that there was a positive relationship between the DBH and crown width in both natural and plantation stands. Reached ages by DBH were no significant difference in natural stands. Reached ages on DBH 10 cm were approximately 19 and 9 in natural and plantation stands, respectively. 본 연구는 우산고로쇠나무의 적정 식재밀도와 식재시기를 결정하기 위해 자생지와 조림지의 생장특성을 분석하고 조림 시 수액채취 도달연수를 구명하기 위해 수행되었다. 토양은 자생지가 조림지에 비해 비옥한 것으로 나타났고 조림지의 생장특성을 분석해 본 결과 초기생장은 식재밀도에 영향을 받은 것으로 나타났다. 자생지와 조림지에서 흉고직경과 수관폭이 높은 상관관계를 나타내었다. 자생지의 흉고직경별 도달연수는 통계적으로 유의차가 없어 경급별 생장차이는 나타나지 않았다. 수액채취 가능 흉고직경 10 cm에 도달하는 연수는 자생지에서 약 19년, 조림지에서 약 9년으로 나타났다.