松嫩平原盐碱化草地消融期土壤水盐运移特征  

Characteristic of moisture and salt dynamic in saline-alkalized grassland of Songnen Plain during thawing period

作　　者：姜世成[1] 周道玮[1] 靳英华[1] 

机构地区：[1]吉林省生态恢复与生态系统管理重点实验室植被生态科学教育部重点实验室东北师范大学草地科学研究所,吉林长春130024

出　　处：《东北师大学报（自然科学版）》2006年第4期124-128,共5页Journal of Northeast Normal University(Natural Science Edition)

基　　金：国家重点基础研究规划项目(G2000018602);东北师范大学自然科学青年基金资助项目(111437;2060403)

摘　　要：研究了松嫩盐碱化草地消融期盐碱裸地和羊草草地土壤剖面水盐变化．结果表明，土壤消融过程中，冻结层双向融化，上层消融速度快于下层，盐碱裸地消融速度快于羊草草地；强烈的水分蒸发引起表层土壤（0-20cm）水分损失严重，引发深层盐分向上迁移，在冻结期潜在积盐的基础上，形成春季表层土壤的“爆发式”积盐．与羊草草地相比，盐碱裸地表层积盐更为强烈，盐分来源于较深的土壤剖面．The characteristic of moisture and salt movement was studied in bare saline-alkalined patch and Leymus chinensis community in saline-alkalized grassland of Songnen Grassland during thawing period. The results showed that during the melting process of the two-way-frozen layer, the upper melt faster than the lower. The upper frozen layer of the bare saline-alkalined patch melt faster than that of Leymus chinensis community. The strong moisture evaporation brings serious water loss in the surface（0-20 cm） and caused the upward movement of salt in deeper soil. The salt accumulated in the surface like ＂eruption＂ in the early spring,on the base of the potential salt accumulation in the frozen period. Compare with Leymus chinensis community, the salt assembled in the surface is rooted from the deeper soil profiles and its level of salification is more intensive in the bare saline-alkalined patch.

关 键 词：季节性冻融 消融期 盐碱裸地 水盐运移 

分 类 号：Q948.113[生物学—植物学]