Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Sequential inorganic chemical analysis of a core from Slapton Ley, Devon, UK
AU - Heathwaite, A.Louise
AU - O'Sullivan, P E
N1 - Sequential inorganic chemical analysis of a core from Slapton Ley, Devon, UK 8 cites: http://scholar.google.com/scholar?num=100&hl=en&lr=&cites=14293156621485342189
PY - 1991
Y1 - 1991
N2 - Analysis of the upper 40 cm of a sediment core from Slapton Ley, a coastal lake in SW England was based on the fractionation procedure devised by Engstrom (Engstrom & Wright, 1984). This allows separation of the sediment into authigenic, biogenic and allogenic components. Lead-210 dating of the same core enabled trends in both concentration (mg g–1 dry mass) and influx (mg cm–2 a–1) to be evaluated, and to be compared with events over the past two hundred years in the Ley and its catchment. The results show that before ca. 1950 AD, Slapton Ley was a shallow, clear, eutrophic lake, into which, in the mid-C19th, calcareous material was introduced by a phase of lime-kiln operation, road construction and lake level control. Since 1950, erosion of detrital material from the catchment has increased, as has the input of both allogenic and authigenic phosphorus, and biogenic silica. These changes reflect the intensification of agriculture post-1945, and the construction of Slapton sewage treatment works in 1953. A major peak in authigenic nitrogen, 6 cm below the present sediment surface, is correlated with the severe 1976 drought in the UK. The ecosystem of the Ley appears to have been triggered by this event into its present hypertrophic state.
AB - Analysis of the upper 40 cm of a sediment core from Slapton Ley, a coastal lake in SW England was based on the fractionation procedure devised by Engstrom (Engstrom & Wright, 1984). This allows separation of the sediment into authigenic, biogenic and allogenic components. Lead-210 dating of the same core enabled trends in both concentration (mg g–1 dry mass) and influx (mg cm–2 a–1) to be evaluated, and to be compared with events over the past two hundred years in the Ley and its catchment. The results show that before ca. 1950 AD, Slapton Ley was a shallow, clear, eutrophic lake, into which, in the mid-C19th, calcareous material was introduced by a phase of lime-kiln operation, road construction and lake level control. Since 1950, erosion of detrital material from the catchment has increased, as has the input of both allogenic and authigenic phosphorus, and biogenic silica. These changes reflect the intensification of agriculture post-1945, and the construction of Slapton sewage treatment works in 1953. A major peak in authigenic nitrogen, 6 cm below the present sediment surface, is correlated with the severe 1976 drought in the UK. The ecosystem of the Ley appears to have been triggered by this event into its present hypertrophic state.
KW - Paleolimnology
KW - sediment chemistry
KW - sequential analysis
KW - 210Pb dating
KW - eutrophication
KW - lake level changes
U2 - 10.1007/BF00050941
DO - 10.1007/BF00050941
M3 - Journal article
VL - 214
SP - 125
EP - 135
JO - Hydrobiologia
JF - Hydrobiologia
IS - 1
ER -