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Tuzcu O, ?evik B, Kaplankiran M. Influence of differentirrigation methods on nutrient uptake of lemon trees. Advancesin Horticultural Science, 1988, 2(3): 79-83.
Hipondoka M H, Aranibar J N, Chirara C, et a1. Verticaldistribution of grass and tree roots in arid ecosystems ofSouthern Africa: Niche differentiation or competition.Journal of Arid, 2003, 54(2): 319-325.
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David R T, Andrew B C. Manipulation of density of Pseudotsugamenziesii canopies: Preliminary effects on understoryvegetation. Canadian Journal of Forest Research,2001, 31(9): 1513-1525.