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Idesia (Arica)

versión On-line ISSN 0718-3429

Resumen

VARGAS, Marta; RODRIGUEZ-MALEBRAN, Mariano; NAVARRETE, Carlos  y  IBANEZ, Cristian. Effects of two irrigation rates and shade on survival and plant growth in an endangered native shrub of Coquimbo Region. Idesia [online]. 2017, vol.35, n.4, pp.57-66. ISSN 0718-3429.  http://dx.doi.org/10.4067/S0718-34292017000400057.

The aim of this work was to evaluate the effect of two irrigation rates and shade on survival and plant growth parameters of Myrcianthes coquimbensis, an endangered and endemic shrub of the coastal dry area of the Coquimbo Region. Evaluations were performed for 24 months. During the first three months, the plants were watered with 12 or 24 L/month, after which the irrigation was suspended until the end of the study. The results showed that the application of an irrigation of 12 L/month during the first three months ensured an initial survival of plants close to 100%, regardless of whether or not they had shade. During this initial period, the use of shade only allowed to observe significant differences in the growth of new shoots. From the moment the irrigation was suspended (beginning of the fourth month post-afforestation), the effect of the shade became important. Thus, while shade-less plants reduced their survival rate by around 20%, with a temporary increase to 30% after winter rains and drop at about 15% by the second year, shady plants maintained survival values near to 50% during first year and 30% at the end of the study. The results showed that any afforestation strategy attempted in this native shrub should be accompanied by a minimum establishment irrigation rate of 12 L/month andpermanent shadow support. This study is a contribution for the in situ conservation of this valuable and unique shrub of Chile.

Palabras clave : Myrtacea; afforestation; arid zones; in situ conservation..

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