کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4394541 1305543 2007 15 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Positive associations involving the tussock grass Panicum turgidum Forssk. in the Aïr-Ténéré Reserve, Niger
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
Positive associations involving the tussock grass Panicum turgidum Forssk. in the Aïr-Ténéré Reserve, Niger
چکیده انگلیسی

In the Saharan mountain range of the Aïr, Niger, the tussock-grass Panicum turgidum Forssk. was hypothesized to act as a nurse plant for a number of species. Multiple spatial positive associations involving P. turgidum were detected along an aridity gradient with an index comparing species richness inside vs. outside tussocks. Associated plants were annuals and young and/or small perennials. Comparative abiotic measurements inside tussocks and in openings showed that P. turgidum diminished seriously the stress induced by vapor pressure deficit (VPD) during the harshest periods of the day (p<0.001, randomization test). This trait identified it as a potential nurse plant. The preference for hosted plants to develop inside dead tussocks rather than in living tussocks at the driest site may indicate that the nurse plant potential of P. turgidum tussocks declined in the presence of extreme water stress. Further experimental work, especially removal experiments, should improve the understanding of the underlying mechanisms of facilitation processes in this particularly harsh environment.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Arid Environments - Volume 68, Issue 3, February 2007, Pages 348–362
نویسندگان
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