کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4394401 1305534 2008 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Estimating annual rainfall threshold for establishment of tree species in water-limited ecosystems using tree-ring data
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
Estimating annual rainfall threshold for establishment of tree species in water-limited ecosystems using tree-ring data
چکیده انگلیسی
In arid and semi-arid ecosystems, water availability is discontinuous, highly variable, and characterized by discrete pulse events separated by long periods of limited resource availability. Plant recruitment in these ecosystems is also episodic and dependent on the water available during and after these discrete rainfall events. Precipitation thresholds for plant establishment have been estimated mainly for herbaceous plants and tree seedlings, but extrapolation of short-term results based on seedlings to natural tree populations is difficult. Nevertheless, estimations of water availability thresholds for tree recruitment are essential for successful policies on forest conservation and restoration. We propose a methodology to estimate precipitation thresholds for adult tree populations using tree-ring series and precipitation data. We used this methodology with two Prosopis species from South America: Prosopis pallida and Prosopis chilensis. Results indicate a precipitation threshold of around 85 mm for the establishment of P. pallida trees, whereas the threshold for P. chilensis is likely to be much higher.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Arid Environments - Volume 72, Issue 5, May 2008, Pages 602-611
نویسندگان
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