Effects of Elevated $CO_2$ Concentration and Temperature on Growth Response of Quercus acutissima and Q. variabilis

지구온난화에 따른 상수리나무와 굴참나무의 생육반응에 관한 연구

  • Jeong, Jung-Kyu (Graduate School Dept. of Biology, Kongju National University) ;
  • Kim, Hae-Ran (Graduate School Dept. of Biology, Kongju National University) ;
  • You, Young-Han (Graduate School Dept. of Biology, Kongju National University)
  • 정중규 (공주대학교 대학원 생물학과) ;
  • 김해란 (공주대학교 대학원 생물학과) ;
  • 유영한 (공주대학교 대학원 생물학과)
  • Received : 2010.03.18
  • Accepted : 2010.12.22
  • Published : 2010.12.31

Abstract

Global warming brings changes of natural ecosystems and affects on the plant growth response. Quercus acutissima and Q. variabilis are taxonomically similar and dominant native species in deciduous forests in South Korea. In order to understand the growth response of Q. acutissima and Q. variabilis to global warming condition, we cultivated the seedling of the two oak species in ambient condition(control) and treatment with elevated $CO_2$(700~800ppm) and increased air temperature(approximately $3^{\circ}C$ above than control). Then we measured the growth characteristic among them and analyzed the relationship between two species using PCA ordination. Stem length and total plant weight of Q. acutissima were significantly affected by elevated $CO_2$ concentration and increased air temperature. Stem diameter and weight of Q. variabilis were significantly affected by elevated $CO_2$ concentration and increased air temperature(p<0.05). The variation characteristics of Q. acutissima were changed more than Q. variabilis by elevated $CO_2$ concentration and increased air temperature. These result suggested that Q. acutissima was more sensitive to global warming situation than Q. variabilis in central region of Korea. PCA ordination showed that two species were arranged by two distinct groups based on 10 characters by elevated $CO_2$ and increased air temperature.

지구온난화는 자연생태계에 큰 변화를 가져오고, 식물의 생육에 큰 영향을 미친다. 상수리나무와 굴참나무는 분류학 적으로 가깝고, 우리나라 산림 저지대에서 우점종이다. 본 연구는 두 종의 어린 묘목이 $CO_2$농도와 기온이 증가하면 생육반응이 어떻게 일어나는지 알아보기 위해 $CO_2$농도는 700~800ppm으로, 기온은 대조구보다 약 $3^{\circ}C$높게 처리하여 생장특성을 측정하고 분석하였다. 상수리나무는 지구온난화처리구에서 뚜렷하게 차이나는 형질이 줄기 길이와 식물체 무게이고, 굴참나무는 줄기 직경과 줄기 무게이었다(p<0.05). 또한 평균 변화율로 보았을 때 굴참나무보다 상수리나무에서 많은 종류의 형질이 크게 변화하였다. 이는 지구온난화조건이 되면 한반도 중부지방에서 굴참나무보다 상수리나무의 생육반응이 더 민감하다는 것을 시사한다. 주성분분석은 두 종이 $CO_2$농도와 기온이 증가하면 종과 상관없이 유사한 경향성으로 배열되어 나타났다. 이러한 반응을 결정짓는 형질은 잎 수, 잎 넓이, 잎 폭, 지상부 길이, 잎 길이, 지상부 무게, 줄기 무게, 잎 무게, 지하부 무게와 식물체 무게 등 대부분의 측정된 것들과 관련이 있었다.

Keywords

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