中巴常绿杨的引种与栽培

Evergreen poplar in China and Pakistan is a mixed clonal system of A-65/27,A-65/31 and A-61/186,thirty-five years ago,In accordance with the provisions of the Protocol of the eighth meeting of china-pakistan scientific and technological cooperation(8-308 items),introduced into our country by the Pakistan Forestry Research Institute,selected by the Cooperative Group through experimental studies in many provinces and cities,and through technical appraisal,it has been widely used for more than 30 years.The chinese-brazilian evergreen poplar is easy to reproduce,has strong adaptability,has a high survival rate,does not shed leaves or half-shed leaves in winter(this characteristic is rare in many poplar varieties),and has a growth period of more than 10 months,grows fast and has straight trunk,good material,suitable for paper and wood processing.The poplar introduced from abroad and cultivated in China in the past were all defoliated varieties in winter,and the clones of chinese-pakistani Evergreen Poplar were successfully introduced as evergreen-semi-evergreen varieties for the first time,facilitated the expansion of our poplar growing areas to the southern subtropics and tropics,achieving the goal set by the collaboration to expand the poplar growing areas to the south of our country.For more than 30 years,popularizing the superior clones of Populus euphratica in suitable plots in the south of our country has produced good ecological and economic benefits,it provides new varieties for the development of fast-growing timber forest and"Four-side"greening in South China,and enriches the poplar germplasm resources in China.