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An 18 000‐year pollen and sedimentary record from the cedar forests of the Middle Atlas, Morocco
Author(s) -
EL BAIT M. NOUR,
RHOUJJATI A.,
EYNAUD F.,
BENKADDOUR A.,
DEZILEAU L.,
WAINER K.,
GOSLAR T.,
KHATER C.,
TABEL J.,
CHEDDADI R.
Publication year - 2014
Publication title -
journal of quaternary science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.142
H-Index - 94
eISSN - 1099-1417
pISSN - 0267-8179
DOI - 10.1002/jqs.2708
Subject(s) - pollen , holocene , vegetation (pathology) , steppe , period (music) , aeolian processes , sedimentary rock , watershed , climate change , physical geography , ecology , environmental science , geography , geology , archaeology , paleontology , biology , medicine , physics , pathology , machine learning , computer science , acoustics
A new record from the heart of the Moroccan Middle Atlas cedar forests spans the last 18 000 years and provides valuable insight into our understanding of the natural vegetation and environmental changes. The approach is based on the study of pollen content, geochemical elements and grain size analysis. The pollen data indicate that the vegetation was dominated by herbaceous plants until 9000 BP. Such open landscape allowed greater soil erosion and an input of chemical elements from the watershed. After 9000 BP, tree cover, mainly oak, increased slightly and was accompanied by a higher taxonomic diversity. However, several steppe elements remain well represented in the area until 5000 BP, which suggests that the climate was rather dry during the first part of the Holocene. After 6000 BP, the climate became more favourable to expansion of the forest ecosystems, including Cedrus atlantica , thereby reducing erosion. A strong reduction of the tree pollen percentages is recorded after 2000 BP, which may be related to increasing human activities during the Roman period. These forest changes are concomitant with an increase of lead and copper concentrations in the record, probably related to Roman metalworking activities.