Geochemical records in recent sediments of Lake Erhai: implications for environmental changes in a low latitude–high altitude lake in southwest China

G.J. Wan, Z.G. Bai, H. Qing, J.D. Mather, R.G. Huang, H.R. Wang, D.G. Tang, B.H. Xiao

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

Sediment cores were collected from Lake Erhai, which is located on the Yunnan–Guizhou Plateau, a landform formed by the uplift of the Himalayas. These sediments were deposited up to about 697±15 years ago based on 210Pbex and 137Cs dating. d13Cinorg, d18Oinorg and d13Corg values and concentrations of Cinorg, Corg, N and P within the sediment cores have been measured. Corg has an average deposition flux of 12.7 g/m2, and an accumulation flux of 7.20 g/m2. The calculated decomposition rate constant is 0.017 a-1 with a half life of 40 a. d13Cinorg and d18Oinorg values range from -1.6 to -7.9‰ and -5.7 to -13.6‰, respectively, and show similar trends over the past 700 years, which is interpreted to be controlled mainly by temperature, corresponding to climatic changes of two and half periods of a ‘warm–cold–warm’ cycle. d13Corg ranges from -25 to -28‰, indicating that the organic matter originated mainly from land-derived plants, with overprinting from anthropogenic activities over the past 460 years (since 1537 Image ). N and Porg concentrations show a similar vertical distribution to Corg. Atomic ratios of organic carbon and nitrogen (C/N) are 5.8 and 6.8 for the deposition and accumulation stages, respectively, similar to the Redfield ratio in the ocean. The C/P ratio, however, is higher than that in the ocean. The vertical distribution of carbon in the sediment cores indicates that Lake Erhai has the characteristics of both an inland lake (land-derived organic matter) and the ocean (similar C/N ratio). The lower C/N and C/P ratios in the lake Erhai sediments are characteristic for a lake at high altitude and in a subtropical region. This ‘low latitude–high altitude effect’ is probably related to the uplift of the Himalayas.
Original languageEnglish
Pages (from-to)489-502
JournalJournal of Asian Earth Sciences
Volume21
Issue number5
DOIs
Publication statusPublished - 2003

Fingerprint

environmental change
sediment core
lake
sediment
vertical distribution
carbon
ocean
uplift
Redfield ratio
organic matter
subtropical region
overprinting
nitrogen
organic nitrogen
half life
landform
lacustrine deposit
human activity
organic carbon
plateau

Keywords

  • organic-matter
  • early diagenesis
  • marine-sediments
  • atmospheric co2
  • carbon-cycle
  • surface sediments
  • continental-shelf
  • phanerozoic time
  • phosphorus
  • model

Cite this

Wan, G.J. ; Bai, Z.G. ; Qing, H. ; Mather, J.D. ; Huang, R.G. ; Wang, H.R. ; Tang, D.G. ; Xiao, B.H. / Geochemical records in recent sediments of Lake Erhai: implications for environmental changes in a low latitude–high altitude lake in southwest China. In: Journal of Asian Earth Sciences. 2003 ; Vol. 21, No. 5. pp. 489-502.
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abstract = "Sediment cores were collected from Lake Erhai, which is located on the Yunnan–Guizhou Plateau, a landform formed by the uplift of the Himalayas. These sediments were deposited up to about 697±15 years ago based on 210Pbex and 137Cs dating. d13Cinorg, d18Oinorg and d13Corg values and concentrations of Cinorg, Corg, N and P within the sediment cores have been measured. Corg has an average deposition flux of 12.7 g/m2, and an accumulation flux of 7.20 g/m2. The calculated decomposition rate constant is 0.017 a-1 with a half life of 40 a. d13Cinorg and d18Oinorg values range from -1.6 to -7.9‰ and -5.7 to -13.6‰, respectively, and show similar trends over the past 700 years, which is interpreted to be controlled mainly by temperature, corresponding to climatic changes of two and half periods of a ‘warm–cold–warm’ cycle. d13Corg ranges from -25 to -28‰, indicating that the organic matter originated mainly from land-derived plants, with overprinting from anthropogenic activities over the past 460 years (since 1537 Image ). N and Porg concentrations show a similar vertical distribution to Corg. Atomic ratios of organic carbon and nitrogen (C/N) are 5.8 and 6.8 for the deposition and accumulation stages, respectively, similar to the Redfield ratio in the ocean. The C/P ratio, however, is higher than that in the ocean. The vertical distribution of carbon in the sediment cores indicates that Lake Erhai has the characteristics of both an inland lake (land-derived organic matter) and the ocean (similar C/N ratio). The lower C/N and C/P ratios in the lake Erhai sediments are characteristic for a lake at high altitude and in a subtropical region. This ‘low latitude–high altitude effect’ is probably related to the uplift of the Himalayas.",
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Geochemical records in recent sediments of Lake Erhai: implications for environmental changes in a low latitude–high altitude lake in southwest China. / Wan, G.J.; Bai, Z.G.; Qing, H.; Mather, J.D.; Huang, R.G.; Wang, H.R.; Tang, D.G.; Xiao, B.H.

In: Journal of Asian Earth Sciences, Vol. 21, No. 5, 2003, p. 489-502.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Geochemical records in recent sediments of Lake Erhai: implications for environmental changes in a low latitude–high altitude lake in southwest China

AU - Wan, G.J.

AU - Bai, Z.G.

AU - Qing, H.

AU - Mather, J.D.

AU - Huang, R.G.

AU - Wang, H.R.

AU - Tang, D.G.

AU - Xiao, B.H.

PY - 2003

Y1 - 2003

N2 - Sediment cores were collected from Lake Erhai, which is located on the Yunnan–Guizhou Plateau, a landform formed by the uplift of the Himalayas. These sediments were deposited up to about 697±15 years ago based on 210Pbex and 137Cs dating. d13Cinorg, d18Oinorg and d13Corg values and concentrations of Cinorg, Corg, N and P within the sediment cores have been measured. Corg has an average deposition flux of 12.7 g/m2, and an accumulation flux of 7.20 g/m2. The calculated decomposition rate constant is 0.017 a-1 with a half life of 40 a. d13Cinorg and d18Oinorg values range from -1.6 to -7.9‰ and -5.7 to -13.6‰, respectively, and show similar trends over the past 700 years, which is interpreted to be controlled mainly by temperature, corresponding to climatic changes of two and half periods of a ‘warm–cold–warm’ cycle. d13Corg ranges from -25 to -28‰, indicating that the organic matter originated mainly from land-derived plants, with overprinting from anthropogenic activities over the past 460 years (since 1537 Image ). N and Porg concentrations show a similar vertical distribution to Corg. Atomic ratios of organic carbon and nitrogen (C/N) are 5.8 and 6.8 for the deposition and accumulation stages, respectively, similar to the Redfield ratio in the ocean. The C/P ratio, however, is higher than that in the ocean. The vertical distribution of carbon in the sediment cores indicates that Lake Erhai has the characteristics of both an inland lake (land-derived organic matter) and the ocean (similar C/N ratio). The lower C/N and C/P ratios in the lake Erhai sediments are characteristic for a lake at high altitude and in a subtropical region. This ‘low latitude–high altitude effect’ is probably related to the uplift of the Himalayas.

AB - Sediment cores were collected from Lake Erhai, which is located on the Yunnan–Guizhou Plateau, a landform formed by the uplift of the Himalayas. These sediments were deposited up to about 697±15 years ago based on 210Pbex and 137Cs dating. d13Cinorg, d18Oinorg and d13Corg values and concentrations of Cinorg, Corg, N and P within the sediment cores have been measured. Corg has an average deposition flux of 12.7 g/m2, and an accumulation flux of 7.20 g/m2. The calculated decomposition rate constant is 0.017 a-1 with a half life of 40 a. d13Cinorg and d18Oinorg values range from -1.6 to -7.9‰ and -5.7 to -13.6‰, respectively, and show similar trends over the past 700 years, which is interpreted to be controlled mainly by temperature, corresponding to climatic changes of two and half periods of a ‘warm–cold–warm’ cycle. d13Corg ranges from -25 to -28‰, indicating that the organic matter originated mainly from land-derived plants, with overprinting from anthropogenic activities over the past 460 years (since 1537 Image ). N and Porg concentrations show a similar vertical distribution to Corg. Atomic ratios of organic carbon and nitrogen (C/N) are 5.8 and 6.8 for the deposition and accumulation stages, respectively, similar to the Redfield ratio in the ocean. The C/P ratio, however, is higher than that in the ocean. The vertical distribution of carbon in the sediment cores indicates that Lake Erhai has the characteristics of both an inland lake (land-derived organic matter) and the ocean (similar C/N ratio). The lower C/N and C/P ratios in the lake Erhai sediments are characteristic for a lake at high altitude and in a subtropical region. This ‘low latitude–high altitude effect’ is probably related to the uplift of the Himalayas.

KW - organic-matter

KW - early diagenesis

KW - marine-sediments

KW - atmospheric co2

KW - carbon-cycle

KW - surface sediments

KW - continental-shelf

KW - phanerozoic time

KW - phosphorus

KW - model

U2 - 10.1016/S1367-9120(02)00076-7

DO - 10.1016/S1367-9120(02)00076-7

M3 - Article

VL - 21

SP - 489

EP - 502

JO - Journal of Asian Earth Sciences

JF - Journal of Asian Earth Sciences

SN - 1367-9120

IS - 5

ER -