Aboveground nutrient components of Eucalyptus camaldulensis and E. grandis in semiarid Brazil under the nature and the m

A study was conducted to evaluate the aboveground biomass, nutrient content and the percentages of mycorrhizal colonization in Eucalyptus camaldulensis and Eucalyptus grandis plantations in the semiarid region (15° 09' S 43° 49' W) in the north of the State of Minas Gerais in Brazil. Results show that the total above-ground biomass (dry matter) was 33.6 Mg·ha-1 for E. camaldulensis and 53.1 Mg·ha-1 for E. grandis. The biomass of the stem wood, leaves, branches, and stem bark for E. camaldulensis accounted for 64.4%, 19.6%, 15.4%, and 0.6% of the total biomass, respectively (Table 2); meanwhile a similar partition of the total above-ground biomass was also found for E. grandis. The dry matter of leaves and branches of E. camaldulensis accounted for 35% of total biomass, and the contents of N, P, K, Ca, Mg, and S in leaves and branches accounted for 15.5%, 0.7%, 12.3%, 22.6%, 1.9%, and 1.4% of those in total above-ground biomass, respectively. In the trunk (bark and wood), nutrient accumulation in general was lower. Nutrient content of E. grandis presented little variation compared with that of E. camaldulensis. Wood localized in superior parts of trunk presented a higher concentration of P and bark contained significant amounts of nutrients, especially in E. grandis. This indicated that leaving vegetal waste is of importance on the site in reducing the loss of tree productivity in this semi-arid region. The two species showed mycotrophy.

作 者： Marcela C. Pagano Antonio F. Bellote Maria R. Scotti   作者單位： Marcela C. Pagano,Maria R. Scotti(Microorganism-Plant Interaction Laboratory, Institute of Biological Sciences, Federal University of Minas Gerais, Av. Ant(o)nio Carlos, 6627, Pampulha, CEP: 31270-901, Belo Horizonte, MG, Brazil)

Antonio F. Bellote(Embrapa Forestry, Estrada da Ribeira, km 111, Caixa Postal 319 - Colombo, PR - 83411-000- , Brazil) 

刊 名： 林業(yè)研究（英文版）  英文刊名： JOURNAL OF FORESTRY RESEARCH  年，卷(期)： 2009 20(1)  分類號： S7  關鍵詞： Eucalyptus   biomass   nutrient components   semi-arid region   mycorrhizal symbioses   Brazil  

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