[논문]멕시코 과나하토주의 호야산 니콜라스 지역에서 있었던 홀로세 환경변화와 인간의 영향

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멕시코 과나하토주의 호야산 니콜라스 지역에서 있었던 홀로세 환경변화와 인간의 영향
Holocene Environmental Change and Human Impact in Hoya San Nicolas, Guanajuato, Mexico 원문보기

대한지리학회지 = Journal of the Korean Geographical Society, v.40 no.5 = no.110, 2005년, pp.571 - 583

초록
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본 연구에서는 중부 멕시코 바히오 지방에 위치한 바예 데 산티아고 시의 마르 호수 중 하나인 호야 산 니콜라스에서 채취한 시료를 분석하여 고환경을 복원하였다. 마르 호수 퇴적물은 고해상의 고환경 복원이 가능하기 때문에 널리 이용되고 있다. 연구방법으로 화분, 동위원소, 지화학적 분석 등을 시도하였다. 분석결과를 보면, 11,000년 전에서 8,900년 전까지 기후는 건조하였고, 8,900 년 전부터 7,000 년 전까지는 습했으며, 7,000년 전부터 4,000 년 전까지 건조하였고, 4,000년 전부터 현재까지는 다시 습했다. 두 건조한 기간(ca. 11,000 - ca. 8,900 cal yr B.P., ca. 7,000 - ca. 4,000 cal yr B.P.)에 소나무 화분이 비율이 아주 높게 나온다. 이는 건조한 기후로 호수가 마르면서 전체적으로 화분이 파괴되었음 의미한다. 다시 말하면, 가장 단단한 화분중의 하나인 소나무 화분은 건조한 상태에서 다른 화분보다 상대적으로 잘 버티므로 소나무 화분의 높은 비율은 기후가 건조했음을 뜻한다고 볼 수 있다. 두 건조 시기에는 호숫물이 말라 퇴적이 중단된 기간이 있었을 것으로 사료된다.

Abstract ▼ AI-Helper

This paper presents a paleoenvironmental study on Hoya San Nicolas, a maar lake in Valle de Santiago in Central Mexican Bajio. Maar lake sediments have been widely used for high-resolution reconstruction of paleoenvironment. Many different paleoenvironmental proxy data such as stable isotopes, pollen, and sediment chemistry were produced in this study. These data help to reveal paleoenviromental changes throughout the whole period covered by sediment materials from this study site. The evidence indicates that during ca. 11,000 - ca. 8,900 cal yr B.P. there was dry climate; during ca. 8,900 - ca. 7,000 cal yr B.P. it was wetter; during ca. 7,000 - ca. 4,000 cal yr B.P. drier; during ca. 4,000 cal yr B.P - the present wetter. Prominent dominance of Pinus pollen during ca. 11,000 - ca. 8,900 cal yr B.P. and during ca. 7,000 - ca. 4,000 cal yr B.P. may reflect very low lake levels resulting in poor preservation of pollen. Pinus pollen, the most resistant pollen type, may have been able to survive severe deterioration due to arid climate, but other pollen types may not. Due to likely droughts in these periods, a sedimentation gaps are probably present in the core.

주제어

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가설 설정

The isotopic data (3-point running mean) are displayed in Figure 6. Downcore changes in ^18O and 513C vahies are basically coherent. The results of chemical analyses(XRF) and magnetic susceptibility are shown in Figure 7.

제안 방법

We produce a new pollen diagram from Hoya San Nicolas with more levels and more pollen counted per level than Brown (1984). Also, this paper provides other proxy data such as data collected from the study of stable isotopes and XRF analyses as w이 1 as pollen record to reconstruct paleoenvironment of Central Mexico.
Loss on ignition analyses were carried out to determine sediment composition as follows: oven dryin응 at 10013 for 24 hours for water content, heating at 550 p for 1 hour for organic content. Residue of sediment samples was then analyzed with a Philips PW 2400 X-Ray Florescence scanner (XRF) to determine chemical composition.

대상 데이터

Samples containing about 10 to 100 microgram calcite or aragonite were used for both carbon and oxygen isotope analyses, which were determined using a GV IsoPrime mass spectrometer with Dual-Inlet and MultiCarb systems. Several replicates of two international standards NBS18 and NBS19, and one lab standard HKC-I were measured along with samples for each run. The overall external analytical precision is ±0.
The chronology was established based on four AMS radiocarbon dates for Hoya San Nicolas core (Table 1). These dates are on charcoal picked from the 125仰i sieved fragments.
Two tablets of Lycopodium spores were added to each sample to calculate pollen concentration (Stockmarr, 1971). The samples were mounted on microscope slides with silicone oil. Pollen counts were made on a Leitzmicroscope with a 40x Planapochromat objective and a total magnification of 400x.

참고문헌 (29)

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