Efecto del estrés hídrico sobre la acumulación y distribución de biomasa en Eucalyptus grandis W. Hill ex Maiden

Acta Agronomica

Urrego, John Byron¹  Tafur*, María Sara Mejía - de²  Ibarra, Dora Mónica²  Zapata, Claudia Marcela -²  Leal, José Joaquín² 

[1]Smurfit Kappa Cartón de Colombia, Cali, Colombia

[2]Universidad Nacional de Colombia sede Palmira, Colombia

关键词: Flooding;    Water use Efficiency (WUE);    leaf area;    genotype-environment relationship.;   

DOI  :  10.15446/acag.v66n1.52628

学科分类：农业科学（综合）

来源: Universidad Nacional de Colombia * Facultad de Ciencias Agropecuarias Palmira

【 摘 要 】

In order to evaluate the effect of water stress on growth and biomass distribution of E. grandis, two experiments were established in pots outdoors in contrasting sites of Valle del Cauca, Colombia (Palmira, 23.5°C and Restrepo, 18°C),there were evaluated four genotypes (28-3, 18-3, 24A-5 and 1-19) to soil water availability (at field capacity (fc) 1/2 fc, 1/4 fc and saturation) using a divided plot design, with 16 treatments and 4 replications. The pots surface was covered with plastic fabric divided to prevent the entry of rain water. In both locations significant differences between treatments were presented. In Palmira the plants accumulated more biomass when the soil was at fc and in Restrepo with 1/2 fc and 1/4 fc. The most limiting treatment at both sites was soil saturation. Genotypes also differ in the ability to accumulate biomass being the 24A-5 and 28-3 those with greater stems weight but not in leaves. Positive and highly significant relationship between leaf area and biomass in stems and more water use efficiency (WUE) were with water deficit. However, the tolerance to stress caused the decrease in biomass accumulation, due to the wasted energy to activate the defense mechanisms, this could vary depending on the stress intensity and other environmental conditions such as temperature.

【 授权许可】

CC BY-NC-SA