Mixed and monospecific stands of eucalyptus and black-wattle: I - fine root length density

Ciência Rural

Márcio Viera²  Mauro Valdir Schumacher¹  Edenilson Liberalesso¹ 

[1] ,Fundação Estadual de Pesquisa Agropecuária Fepagro Florestas Santa Maria RS ,Brasil

关键词: fine root length density;    Eucalyptus grandis x E. urophylla;    Acacia mearnsii;    mixed-species Eucalyptus plantations;    interactions;    densidade do comprimento de raízes finas;    Eucalyptus grandis x E. urophylla;    Acacia mearnsii;    plantio misto de eucalipto;    interações;   

DOI  :  10.1590/S0103-84782012005000074

来源: SciELO

【 摘 要 】

Fine root length density (FRLD) was evaluated in mixed and monospecific stands of Eucalyptus grandis x E. urophylla and Acacia mearnsii in Southern Brazil. FRLD (≤2,0mm) at 8 and 18 months after planting in the treatments: 100E (100% of eucalyptus); 100A (100% of Acacia mearnsii); 50E:50A (50% of eucalyptus + 50% of Acacia mearnsii). The findings demonstrated that the FRLD at 8 months of age have the same distribution, in the two different species, in the distribution of the different soil layers, reaching the maximum projection of 125cm from the tree trunk. For the age of 18 months after planting, it was verified that the FRLD in the monospecific stand of Acacia mearnsii was higher than in the monoculture and mixed stand of Eucalyptus grandis x E. urophylla. Therefore, no interaction, neither positive nor negative, between the root systems of Eucalyptus grandis x E. urophylla and Acacia mearnsii during the 18 months after planting was found. The higher FRLD is found at the soil layers surface, next to the tree trunk and in the planting line, followed by the diagonal and planting rows. The initial growth in length of the root system of Acacia mearnsii is more dynamic with higher density than the eucalyptus, but without interfering directly in the global growth of fine roots in mixed stands.

【 授权许可】

CC BY   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License