کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8848496 | 1618206 | 2018 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Contrasting ecophysiology of two widespread arid zone tree species with differing access to water resources
ترجمه فارسی عنوان
اکوفیزیولوژی کنتراست از دو گونه گسترده درختان دره خشک با دسترسی متفاوت به منابع آب
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
فرآیندهای سطح زمین
چکیده انگلیسی
Arid environments can support the seemingly unlikely coexistence of species tolerant of, or sensitive to, dry soil moisture. Here, we examine water-use and carbon-gain traits in two widespread tree species in central Australia: Acacia aptaneura and Eucalyptus camaldulensis. The former has a shallow root distribution and relies on soil moisture, while the latter is groundwater dependent. We hypothesised that A. aptaneura would exhibit a suite of characteristics that confer tolerance to low soil moisture, in contrast to E. camaldulensis. Consistent with our hypotheses A. aptaneura was relatively more anisohydric than E. camaldulensis (seasonal leaf water potential of â7.2 to â0.8â¯MPa cf. â1.4 to â0.3â¯MPa). Additionally, compared to E. camaldulensis, A. aptaneura had lower water potential at turgor loss (â2.5 cf. â1.1â¯MPa); a larger Huber value; smaller, narrower and thicker phyllodes/leaves; and larger photosynthetic capacity (Jmax); and larger water-use efficiency. Further, water-use efficiency for E. camaldulensis was similar to species receiving annual rainfall of 1500â¯mm, despite annual rainfall of 348â¯mm. We conclude that mean annual rainfall is the dominant determinant of water and carbon relations for A. aptaneura, but not E. camaldulensis. This has important implications for ecosystem-scale transpiration and primary productivity across this arid zone.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Arid Environments - Volume 153, June 2018, Pages 1-10
Journal: Journal of Arid Environments - Volume 153, June 2018, Pages 1-10
نویسندگان
Rachael H. Nolan, Tonantzin Tarin, Rizwana Rumman, James Cleverly, Kendal A. Fairweather, Sepideh Zolfaghar, Nadia S. Santini, Anthony P. O'Grady, Derek Eamus,