我国盐碱地分布颊广,以北方较多,而东北的盐碱土主要分布在西部及南部沿海,至於黑龙江省西部嫩江流域干草原地带数县有广大面积之盐碱地。该地乡土树种甚少,在造林及防护林营造上树种选择成为重要问题。 黑龙江省盐碱地区,气候干早,蒸发旺盛,而雨量很少,树木成活已较困难,加上土中盐碱影响树木生长,因部分有效养料成不溶性,以致植物不能吸收,加上含盐量多,土壤溶液浓度增大,其渗透压可超过一般植物的渗透压,使根部不能吸收水分,造成生理干旱,甚至因溶盐渗透而造成细胞质壁分离,致其死亡。且鹽类有毒害作用,能腐蚀植物根茎伤害其组织,且能压制有益菌类之活动,使 Saline-alkaline land is distributed widely in the north, with more in the north, whereas saline-alkali soil in the northeast is mainly distributed in the western and southern coasts. As for the counties in Nenjiang River Basin in the west of Heilongjiang Province, there are vast areas of saline-alkali land. There are very few native trees in this area, and the choice of tree species for afforestation and shelterbelts has become an important issue. Heilongjiang Province saline-alkali region, dry climate early, strong evaporation, and rainfall is very small, trees have been more difficult to survive, coupled with soil salt and alkali affect the growth of trees, as part of the effective nutrients into insoluble, so that plants can not absorb, with salt content When the concentration of soil solution increases, its osmotic pressure can exceed the osmotic pressure of common plants, so that the roots can not absorb water and cause physiological drought. Even the dissolution of soluble salts leads to the separation of the cytoplasmic wall and causes death. And salt poisoning effect, can corrode plant rhizome damage its organization, and can suppress the activity of beneficial bacteria, so that