s :Through to the Populus pyramidalys × P .nigraand P .nigra× P .simonii of 3~4a in micro-climatic plain of Heilongjiang、Sanjiang Plain and Song-Nen Plain with regional trial comparison ,and the results showed that the resistance and fast-growth of P .pyramidalys × P .nigra and P .nigra× P .si-moniiwere superior to that of P.simonii× P.nigra.Therefore ,P.pyramidalys × P.nigraand P. nigra× P .simonii were suitable for early cultivation in the three areas .%通过对杨树新品系美黑3号与黑小2号在黑龙江省林区小气候平原区、三江平原、松嫩平原3～4a的区试评比，研究分析表明：美黑3号与黑小2号在抗性与速生性上均优于当地对照品种小黑杨。因此，美黑3号与黑小2号在以上3地区均适宜早期栽培。
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