In this study,six phenological characters,i.e.the flowering,first foliation,second foliation,maturity,leaf coloration and defoliation of Populus euphratica Oliv.in the lower reaches of the Tarim River are observed and researched.The results show that the total phenophase of P.euphratica Oliv.form the flowering stage to the defoliation is for 229 days.Among these phenophases,the flowering stage from March 29 to April 19 is the shortest,whereas the maturity stage from May 25 to October 13 is the longest,and their durations are 21 and 141 days respectively.Because of Apocheima cinerarius pest,foliation of P.euphratica Oliv.can occur twice,the first and second foliations occur during the periods from April 4 to May 1 and from May 13 to June 4 respectively.The leaf coloration and defoliation stages occur simultaneously to some extent,they occur during the periods from September 26 to October 28 and from October 11 to November 12 respectively.The maturity stage of P.euphratica Oliv.is as long as more than 4 months,and it occurs simultaneously with flood season,which is advantageous for seed dispersal and germination,seedling rooting and promotion of the regeneration and succession of natural forests of P.euphratica Oliv.The study results also reveal that all the phenophases of P.euphratica Oliv.in the Tarim River Basin are latter than that in Minqin County of Gansu Province but earlier than that in the Turpan Basin of Xinjiang.
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