Effect of spacing and age on nitrogen and phosphorus distribution in biomass of Eucalyptus camaldulensis, Eucalyptus pellita and Eucalyptus urophylla plantations in southeastern Brazil

被引:25
|
作者
Harrison, RB [1 ]
Reis, GG
Reis, MDGF
Bernardo, AL
Firme, DJ
机构
[1] Univ Washington, Coll Forest Resources, Seattle, WA 98195 USA
[2] Univ Fed Vicosa, Dept Engn Florestal, BR-36570000 Vicosa, MG, Brazil
[3] Mannesman Mineracao SA, Belo Horizonte, MG, Brazil
[4] Pains Florestal SA, Tres Marias, MG, Brazil
关键词
eucalyptus plantations; nitrogen; phosphorus; tree spacing; nutrient allocation;
D O I
10.1016/S0378-1127(99)00235-2
中图分类号
S7 [林业];
学科分类号
0829 ; 0907 ;
摘要
The nitrogen and phosphorus accumulation in different tree parts (including root systems) of Eucalyptus camaldulensis Dehnh., Eucalyptus urophylla Blake and Eucalyptus pellita F. Muell. planted at three spacings (3 m x 1.5 m, 3 m x 3 m and 4 m x 3 m) and at three ages (15, 31 and 41 months) were evaluated in the savanna region of central Minas Gerais state in southeastern Brazil. A series of equations were produced to estimate per-tree nitrogen and phosphorus from age, spacing, diameter and height, and per-hectare nitrogen and phosphorus using age, spacing and a tally of tree diameters and heights. The highest N and P concentrations were observed in foliage (15-23 g N kg(-1) and 0.8-1.1 g P kg(-1)) and the lowest N concentration in bolewood (2.4-4.1 g N kg(-1)), while the lowest P concentration was observed in the taproot (0.16-0.29 g P kg(-1)). Total biomass N at age 41 months was greatest in E. urophylla (378-457 kg N ha(-1)), lower in E. pellita (238-326 kg N ha(-1)) and lowest in E. camaldulensis stands (204-240 kg N ha(-1)), depending on spacing. Total biomass P at age 41 months was also greatest in E. urophylla (16.6-21.8 kg P ha(-1)), and about equal in E. pellita (10.4-12.8 P ha(-1)) and E. camaldulensis stands (10.4-12.2 kg P ha(-1)), depending on spacing. As age and spacing increased, individual stems increased in diameter and total N and P, but the relationship between total N and P pools and age and spacing was more variable. (C) 2000 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:167 / 177
页数:11
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