低洼盐碱地地势低平、排水不畅,加之强烈蒸发,盐分不断积累于地表,水文、地质条件恶化。因此在低洼盐碱地造林,要慎重选择树种。乔木树种刺槐刺槐的根可直接固定氮素,是沙碱地造林的先锋树种,但不宜在排水不良的低洼地种植。垂柳喜生活在湿地和水涟,中度耐盐碱,可作盐碱地重要 Low-lying saline-alkali low-lying flat, poor drainage, combined with strong evaporation, salt continue to accumulate on the surface, hydrology, geological conditions worsened. Therefore, in low-lying saline-alkali afforestation, we must carefully choose tree species. Tree species Locust tree locust Robinia pseudoacacia nitrogen can be directly fixed, is the pioneer tree planting of sand and alkali, but not in poor drainage of low-lying cultivation. Weeping Willow hi living in wetlands and ripples, moderate salt, alkali can be used as important