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Nitrogen resorption efficiency (NRE) and proficiency of 28 plant species belonging to five different life-forms were studied in a semi-arid region of northern China. NRE in these species ranged from 29.8% to 76.1% and averaged about 48.0%, depending upon the species and the life-form. The pattern of NRE in different life-forms followed the order of herbs>shrubs>trees>graminoids>N fixers...
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