胡杨种粒微小(长1.0—1.2毫米,中部直径0.5—0.7毫米),种皮薄(33—51微米)易透水透气,鲜种含水量高,而且种熟期在七月上旬至八月上旬,此时气温较高,湿度也较大,种子呼吸旺盛,养分容易消耗,其发芽率下降速度很快。给种子贮藏和远离种源的引种带来一定的困难。如何在远 Populus euphratica tiny (1.0-1.2 mm long, 0.5-0.7 mm in diameter central), seeded thin (33-51 microns) easily permeable to water, fresh water, high moisture content, and the maturity in early July to early August , When the temperature is higher, the humidity is also greater, the seeds breathe, nutrients easily consumed, the germination rate decreased rapidly. The seed storage and far from the introduction of provenance bring some difficulties. How far away