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Paleoecological perspectives of anthropogenic impact in Seocheon, on the west coast of the Korean Peninsula : 서천에서 고생태학적 연구를 통해 본

DC Field Value Language
dc.contributor.advisor김재근-
dc.contributor.authorRhak Yeon Choi-
dc.date.accessioned2017-07-19T02:59:21Z-
dc.date.available2017-07-19T02:59:21Z-
dc.date.issued2015-08-
dc.identifier.other000000067547-
dc.identifier.urihttps://hdl.handle.net/10371/128061-
dc.description학위논문 (석사)-- 서울대학교 대학원 : 과학교육과, 2015. 8. 김재근.-
dc.description.abstractAbstract

Paleoecological study was conducted in the Yonghwasil-mot to reconstruct human activities in Seocheon, Korea. Yonghwasil-mot is a reservoir constructed for the purpose of irrigating paddies. Sediment core was collected and dated using the 210Pb method. The average dry mass accumulation rates from 1863 to 2011 was 1.80 kg m-2 yr-1. The 210Pb flux rate of the study area was 42.4 mBq cm-2 yr-1 and seemed to be affected by wind from China. There was a big increase in the accumulation rate in 1956 and the amount of organic matter, total carbon, nitrogen and phosphorus also increased. This indicates significant input of soil and organic particles into the Yonghwasil-mot and a less decomposed state because of increased water levels. The concentrations of Pb, Cu, As, Cd, and Zn reflect the influences of the Janghang smelter located around 6 km away and Janghang station located around 300 m away. The concentrations of As, Cu, and Pb have decreased slowly since the mid-1990s and the decrease of lead contents is attributed to the government policy banning the sale of leaded gasoline. Pollen analysis revealed that Gramineae and Pinus spp. were high in this area. Alnus spp. dominated below 44 cm depth and abruptly decreased around 1894. This may be related to the expansion of farmland around the study area. Relationship between human activities and changes of water level of Younghwasil-mot was reconstructed through pollen, LOI, C/N stratigraphy. Also, influence of Janghang smelter, Janghang station and the industrialization of Korea on environment was able to identified using heavy metal contents. The 210Pb flux rate suggests that Seocheon is affected by dust from China because of westerlies.
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dc.description.tableofcontentsCONTENTS

Abstract --------------------------------- i
Contents --------------------------------- iii

1. Introduction ------------------------------ 1
1.1 Study background ----------------------- 1
1.2 Study site ---------------------------- 3
2. Material and Methods ------------------------- 4
2.1 Sample collection and analyses --------------- 4
2.2 210Pb dating -------------------------- 5
2.3 Pollen analysis ------------------------ 5
2.4 Physical and chemical stratigraphy------------- 6
2.5 Statistical analysis ---------------------- 6
3. Results --------------------------------- 7
3.1 Radioisotope dating and sediment accumulation rate --- 7
3.2 Pollen stratigraphy ---------------------- 9
3.3 Biogeochemical properties ---------------- 11
3.4 Heavy metal profiles -------------------- 13
3.5 Principal Component Analysis of the elements on
the sediment ------------------------ 13
iv
4. Discussion ------------------------------ 15
4.1 Excess 210Pb flux in Seocheon -------------- 15
4.2 Sedimentology ----------------------- 17
4.3 Water level change of Yonghwasil-mot --------- 18
4.4 History of pollution--------------------- 20
4.5 The relationships of each element in the study area
-------------------------------- 21
5. Reconstructed history of human activities in Seocheon ----- 22

References ------------------------------- 25

Abstract (in Korean) ------------------------- 32


List of Tables

[Table 1] Comparison of sedimentation rates (SR) and element
accumulation rates -------------------- 17
[Table 2] Reconstructed major events and its evidences in the
study site ------------------------- 24
List of Figures

[Fig. 1] Location of study site --------------------- 4
[Fig. 2] Total 210Pb activity with depth (a), and 210Pb dates with
depth profiles (b) of the Yonghwasil-mot sediment core
---------------------------------- 8
[Fig. 3] Sediment accumulation rate and 210Pb dates of the
Yonghwasil-mot sediment core--------------- 8
[Fig. 4] Pollen percentage profiles of the Yonghwasil-mot
sediment core ------------------------ 10
[Fig. 5] Physical and chemical variables in the Yonghwasil-mot
sediment core ------------------------ 12
[Fig. 6] Major heavy metal concentrations in the Yonghwasil
-mot sediment core -------------------- 12
[Fig. 7] PCA Component plot in rotated space showing
relationships among physico-chemical variables in
sediment --------------------------- 15
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dc.formatapplication/pdf-
dc.format.extent1050905 bytes-
dc.format.mediumapplication/pdf-
dc.language.isoen-
dc.publisher서울대학교 대학원-
dc.subjectPaleoecology-
dc.subjectAnthropogenic impact-
dc.subject210Pb dating-
dc.subject210Pb flux-
dc.subjectPollen analysis-
dc.subjectHeavy metals-
dc.subject.ddc507-
dc.titlePaleoecological perspectives of anthropogenic impact in Seocheon, on the west coast of the Korean Peninsula-
dc.title.alternative서천에서 고생태학적 연구를 통해 본-
dc.typeThesis-
dc.contributor.AlternativeAuthor최락연-
dc.description.degreeMaster-
dc.citation.pagesv, 33-
dc.contributor.affiliation사범대학 과학교육과-
dc.date.awarded2015-08-
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