覆沙改良科尔沁沙地-松辽平原交错区盐碱地与造田技术研究

Research on "Sand-covered Reclaimed Crop Land" of Alkali-saline Soil

为了研究盐碱地改造利用,进行了沙土和盐碱土混合,研究混合后的"沙碱土"特性,并实验了其种植作物的幼苗表现。科尔沁沙地与松嫩平原盐碱地和辽河平原盐碱地在松辽分水岭两侧交错重叠分布,面积达350×104hm2,具有可改造旱田100×104hm2的潜力。当盐碱土中混入40%～60%的沙丘风沙土时,电导率指示的盐分含量降低20%～50%,碱化度降低40%～60%,满足种植玉米、向日葵等旱作作物的条件。此区进行盐碱地"覆沙造旱田"在理论和实践上都具有可行性。

In order to reclaim alkali-saline land,we mixed the sandy soil to alkali-saline soil,then evaluated the chemical parameters of mixed soil and the crop seedling response under such grow condition.Sandy land in Horqin,alkali-saline land in Songnen Plain and Liaohe Plain besides watershed ridge of Songnen Plain watershed and Liaohe Plain watershed interlaced and overlapped in mosaic distribution,with an overlapping area up to 3.5 million hm2.It has the potential to be reclaimed as crop land of one million hm2.When 40%-60% of sandy soil was mixed,the salt content which indicated by EC reduced 20%-50%,and ESP reduced 40%-60%.The mixed soil could adapt to many crop＇s growth,such as corn,sunflower,etc.It is feasible to use sand-covered reclaimed crop land in the study area from theoretical and practical aspect.