کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4578688 1630075 2009 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Woody plant population dynamics in response to climate changes from 1984 to 2006 in Sahel (Gourma, Mali)
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
Woody plant population dynamics in response to climate changes from 1984 to 2006 in Sahel (Gourma, Mali)
چکیده انگلیسی
In the short term woody populations were struck by the 1983-1984 droughts irrespective of their edaphic situation and location along the bioclimatic gradient. Drought induced mortality was not more severe under drier climate within the Sahel gradient but occurred sooner after drought in shallow soils, and with a lag of a year or two on flooded clay soils. No evidences were found of higher mortality rates in stands with history of intense grazing. Although rainfall remained below average for a decade after the drought, active recruitment of woody plants occurred in all sites starting as soon as 1985. Recruitment proceeded by successive cohorts, often with short-living perennial undershrubs and pioneer shrubs settling first. Acacia species were among the first to settle or re-establish, especially on the sites most intensively grazed. The release of competition due to drought induced mortality and to the reduction of herbaceous cover contributed to the success of the recruitment. The species composition change that resulted could first be interpreted as a shift toward a more arid tolerant flora, then some diversification occurred since the mid 1990s that could indicate a possible return to previous composition in the long term, confirming the resilience Sahel vegetation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hydrology - Volume 375, Issues 1–2, 30 August 2009, Pages 103-113
نویسندگان
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