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赤红壤表土育苗施石灰后施P、Zn、B对巨桉苗生长的影响

Effect of Lime,P,Zn and B Nutrients on Growth of Eucalyptus grandis Seedlings on Latored Surface Soil

  • 摘要: 对巨桉(Eucalyptus grandis Hilex Maiden)苗营养研究国内外有些报道1~5,但未见有关对巨桉施石灰调整土壤酸度后再施肥的报道。热带地区的赤红壤, 多呈酸性, P普遍缺乏, B或 Zn都是影响树木生长的主要微量元素, 也影响巨桉苗生物量的积累4。

     

    Abstract: In greenhouse, 7 nutrient treatments were conducted on latored soil (Ga) and humus latored soil (Bg), with Eucalyptus grandis Hill ex Maiden.The 7 treatments were CK(no nutrients, control), L(only lime), LP(=L+P), LZn(=L+Zn), LB(=L+B), LPZn(=L+P+Zn) and LPZnB(=L+P+Zn+B).The results showed that there were significant differences in seedlings heights(H), diameter( D0 ) and biomass production between the 7 treatments, and between the interactions of nutrients and soil type.Except(shoot+stem) or root biomass of LZn in Ga soil, and diameter of LZn or LB treatments in Bg soil, there were significant differences in other indexes(H, D0 and biomass) between 6 nutrient treatments and CK.In Ga soil, the H/D0 rates in whole treatments with P nutrient were all less than those of CK treatment;in the opposite, the rates in L, LZn and LB treatments were all more than those of CK treatment.In Bg soil, the H/D0 rates in whole treatments were all less than those of CK treatment.Based on H, D0, biomass above ground, root biomass and total biomass, by the Multiple Objective  Strategic Decision Analysis methods, treatments were optimized and ordered from the excellent to the poor:LPZnLPZnBLPLLBLZnCK in Ga soil; LPZnBLPZnLPLLZnLBCK in Bg soil.When using the surface soil to grow Eucalyptus grandis seedlings, it is necessary to apply P, lime, lime+P, lime+P+Zn and/or B to soil.Finally, distribution relationships among different parts of biomass were described in the two types of soils.

     

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