Direct in vivo evidence of immense stem water exploitation in irrigated date palms

Or Sperling, Or Shapira, Amnon Schwartz, Naftali Lazarovitch

نتاج البحث: نشر في مجلةمقالةمراجعة النظراء

ملخص

During the summer, evaporative demand at midday often exceeds the transport capacity of most desert plants. However, date palms maintain their ecological dominance with sustained and uniquely high rates of transpiration. This high rate of flow cannot be attributed to soil water supply alone. In order to quantify intra-plant water allocation in irrigated date palms, three water-sensing techniques have been incorporated: heat dissipation, gravimetric sampling, and time domain reflectrometry. Each of these methods has known limitations but their integration resulted in a quantitative in vivo accounting of the date palm diurnal and seasonal water mass balance. By incorporating these methods it was possible to determine that date palms substantially rely on the exploitation and recharge of the stem reservoir in their water budget. The stem of mature date palms can hold up to 1 m3 of water and supply 25% of daily transpiration (i.e. 5000 l of water in 100 d of summer). The internal stem water reservoir is consistently recharged by over 50 l per night which allows for successive daytime reuse throughout the entire growing season. More broadly, these findings suggest that internal water allocation and night-time soil-water availability could provide useful information for improving date palm irrigation practices.

اللغة الأصليةإنجليزيّة أمريكيّة
الصفحات (من إلى)333-338
عدد الصفحات6
دوريةJournal of Experimental Botany
مستوى الصوت66
رقم الإصدار1
المعرِّفات الرقمية للأشياء
حالة النشرنُشِر - 1 يناير 2015

All Science Journal Classification (ASJC) codes

  • !!Physiology
  • !!Plant Science

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