Drought and temperature tolerant evaluation of different varieties of (Acacia crassicarpa) at the age of 4 month old in the nursery state

Abstract

Coastal areas in central Vietnam, with 415,560ha, are extreme difficult for land use as they are the hot, poor and highly impacted by climate change. Thus, the evaluation of the drought and hot temperature tolerance is the basic for the selection of suitable Acacia crassicarpa varieties for this
region. We used the method of hot temperature tolerance evaluation by Maxcop; Determination of water retention and restoration capability of the leaves by G.N.Eremeev; Determining the intensity of leaf transpiration
method of Ivanop; Determining the tree withered by the method of V. A. Novikop. The result showed that at the temperature of 40oC to 45oC, the leaves were not damaged. When the temperature come to 50oC, little damages in the leaves appeared. At 55oC larger area of the leaves were
damaged but the leaves were still alive and have the restoration capability. When the temperature come up to 60oC, the leaves appeared more brown bruise severe leaf damages and there was no sigh of possibility of recovery. The amount of water lost after 5 hours from 8.4% to 11.69% because of
water loss of Acacia leaves less than 25% in the leaves so the leaves have the ability to recover and not wilted. Wilting coefficient of the varieties ranges from 4.04% to 4.64%, less than 6% thus the varieties have high drought tolerance ability. This confirms that the acacia varieties species are resistant up to 55oC and are classified as drought resistant species and
suitable for this region