한국농림기상학회지, 제 14권 제4호(2012) (pISSN 1229-5671, eISSN 2288-1859)
Korean Journal of Agricultural and Forest Meteorology, Vol. 14, No. 4, (2012), pp. 196~206
DOI: 10.5532/KJAFM.2012.14.4.196
ⓒ Author(s) 2014. CC Attribution 3.0 License.

남한의 논둑에 발달한 C3/C4 혼생식생의 계절변화

김명현(1), 오영주(2), 김미란(1)
(1)농촌진흥청 국립농업과학원 기후변화 생태과, (2)(주)한반도 생물다양성연구소

(2012년 09월 28일 접수; 2012년 11월 16일 수정; 2012년 11월 26일 수락)

Seasonal Change in C3/C4 Mixed Vegetation Populations
over Paddy Levees in South Korea

Myung-Hyun Kim(1), Young-Ju Oh(2), Miran Kim(1)
(1)Climate Change and Agro-Ecology Division, National Academy of Agricultural Science,
RDA, 150 Suin-Ro Kwenseonku, Suwon 441-707, Korea
(2)Korea Biodiversity Research Center Co., Ltd., 1007 Hoguk-Ro Sundan, Phochon 487-711, Korea

(Received September 28, 2012; Revised November 16, 2012; Accepted November 26, 2012)

Studies of seasonal changes in C3/C4 mixed communities are rare, particularly in Asian summer monsoon climate zones. In our present study, seasonal changes in the profile and coverage of C3 and C4 plants were investigated in 2009 in Haenam, Yeongdong and Cheorwon regions of South Korea (all at different latitudes). The aim was to estimate the impacts of temperature and sunshine duration on species composition and transition timing of the C3 and C4 plants. From our results, the number of C3 plants was found to increase from early spring to mid-May, and then decrease again until September in the Haenam and Yeongdong regions, but continuously increase from early spring to September in the Cheorwon region under relatively low summer temperatures. On the other hand, the number of C4 plants increased from June or July to September in all three regions. These seasonal changes in species number and ratio have a direct impact upon species diversity which is highest when there are no dominant species. The relative coverage and relative summed dominance ratio (SDR’) of the C3 plants decreased from spring to autumn, but increased for the C4 plants during this time in an exponential fashion with increasing accumulated temperature and sunshine duration. The transition timing from C3 to C4 plants occurred when the sum of sunshine duration for the days with daily mean temperature above 5oC was 1017 hrs for the SDR’.

Keyword: C4 plant, Paddy levee, Seasonal change, SDR’, Temperature response



본 연구에서는 기후변화가 농업생태계 식물군락에 미치는 영향을 해석하기 위하여 기상요건이 다른 해남, 영동, 철원 3지역의 논둑에서 시기별로 식생변화를 조사하였다. 그 결과 출현종수에서 C3식물은 해남과 영동에서는 이른 봄부터 5월 중순까지 증가하다가 C4식물이 출현하는 이후부터 계속적으로 감소하였지만, 철원에서는 이른 봄부터 가을까지 계속적으로 증가하는 경향을 나타냈다. C4식물은 해남과 영동에서는 6월 중순, 철원에서는 7월 하순에 출현하여 가을까지 계속적으로 증가하는 경향을 나타냈다. 종다양성의 계절변화에서 해남은 C4식물이 출현하기 전에 가장 높은 값을 나타냈으며 이후에는 급격히 감소하였다. 영동은 C3와 C4식물이 혼생하는 초기에 가장 높은 값을 나타냈으며 이후에 서서히 감소하였다. 철원은 감소경향이 나타나지 않고 계속적인 증가 패턴을 나타냈다. 이들 논둑에 출현하는 식물을 C3와 C4 두 그룹으로 나누어 상대피도 및 상대우점율의 계절변화를 확인한 결과 지역별 차이를 나타내기는 하지만 C3식물에서 C4식물로 교대가 나타나는 것을 확인할 수 있었다. 이러한 교대시기를 온도와 일조시간을 고려한 관계식을 이용하여 추정할 수 있었으며, 일평균기온 5 이상인 날에 대한 일조시간의 누적 합이 1017시간에서 논둑식생의 상대우점율이 C3식물에서 C4식물로 교대하는 것으로 예측했다. 이러한 연구결과는 기후변화에 따른 국내 식생분포의 예측에도 중요한 기초자료로 활용될 수 있을 것으로 판단된다.


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