کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4431758 1619896 2009 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Rhizosphere acidification of faba bean, soybean and maize
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
پیش نمایش صفحه اول مقاله
Rhizosphere acidification of faba bean, soybean and maize
چکیده انگلیسی

Interspecific facilitation on phosphorus uptake was observed in faba bean/maize intercropping systems in previous studies. The mechanism behind this, however, remained unknown. Under nitrate supply, the difference in rhizosphere acidification potential was studied by directly measuring pH of the solution and by visualizing and quantifying proton efflux of roots between faba bean (Vicia faba L. cv. Lincan No.5), soybean (Glycine max L. cv. Zhonghuang No. 17) and maize (Zea mays L. cv. Zhongdan No.2) in monoculture and intercrop, supplied without or with 0.2 mmol L− 1 P as KH2PO4. The pH of the nutrient solution grown faba bean was lower than initial pH of 6.0 from day 1 to day 22 under P deficiency, whereas the pH of the solution with maize was declined from day 13 after treatment. Growing soybean increased solution pH irrespective of P supply. Under P deficiency, the proton efflux of faba bean both total (315.25 nmol h− 1 plant− 1) and specific proton efflux (0.47 nmol h− 1 cm− 1) was greater than that those of soybean (21.80 nmol h− 1 plant− 1 and 0.05 nmol h− 1 cm− 1, respectively). Faba bean had much more ability of rhizosphere acidification than soybean and maize. The result can explain partly why faba bean utilizes sparingly soluble P more effectively than soybean and maize do, and has an important implication in understanding the mechanism behind interspecific facilitation on P uptake by intercropped species.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Science of The Total Environment - Volume 407, Issue 14, 1 July 2009, Pages 4356–4362
نویسندگان
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