دورية أكاديمية
Climate change and ecosystems dynamics over the last 6000 years in the Middle Atlas, Morocco
| العنوان: | Climate change and ecosystems dynamics over the last 6000 years in the Middle Atlas, Morocco |
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| المؤلفون: | M. Nourelbait, A. Rhoujjati, A. Benkaddour, M. Carré, F. Eynaud, P. Martinez, R. Cheddadi |
| المصدر: | Climate of the Past, Vol 12, Iss 4, Pp 1029-1042 (2016) |
| بيانات النشر: | Copernicus Publications, 2016. |
| سنة النشر: | 2016 |
| المجموعة: | LCC:Environmental pollution LCC:Environmental protection LCC:Environmental sciences |
| مصطلحات موضوعية: | Environmental pollution, TD172-193.5, Environmental protection, TD169-171.8, Environmental sciences, GE1-350 |
| الوصف: | The present study aims at reconstructing past climate changes and their environmental impacts on plant ecosystems during the last 6000 years in the Middle Atlas, Morocco. Mean January temperature (Tjan), annual precipitation (Pann), winter (Pw) and summer (Ps) precipitation, and a seasonal index (SI) have all been quantified from a fossil pollen record. Several bio- and geo-chemical elements have also been analysed to evaluate the links between past climate, landscape, and ecosystem changes. Over the last 6000 years, climate has changed within a low temperature and precipitation range with a trend of aridity and warming towards the present. Tjan has varied within a ca. 2 °C range, and Pann within less than 100 mm yr−1. The long-term changes reconstructed in our record between 6 ka cal BP and today are consistent with the aridity trend observed in the Mediterranean basin. Despite the overall limited range of climate fluctuation, we observe major changes in the ecosystem composition, the carbon isotopic contents of organic matter (δ13C), the total organic carbon and nitrogen amount, and the carbon to nitrogen ratio (C / N) after ca. 3750 cal BP. The main ecosystem changes correspond to a noticeable transition in the conifer forest between the Atlas cedar, which expanded after 3750 cal BP, and the pine forest. These vegetation changes impacted the sedimentation type and its composition in the lake. Between 5500 and 5000 cal BP, we observe an abrupt change in all proxies which is coherent with a decrease in Tjan without a significant change in the overall amount of precipitation. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 1814-9324 1814-9332 |
| Relation: | http://www.clim-past.net/12/1029/2016/cp-12-1029-2016.pdf; https://doaj.org/toc/1814-9324; https://doaj.org/toc/1814-9332 |
| DOI: | 10.5194/cp-12-1029-2016 |
| URL الوصول: | https://doaj.org/article/305801fab748429283e1a03a84056125 |
| رقم الأكسشن: | edsdoj.305801fab748429283e1a03a84056125 |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder | تدمد: | 18149324 18149332 |
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| DOI: | 10.5194/cp-12-1029-2016 |