荒漠—绿洲交错带不同植被类型的土壤水盐差异性研究

Study on the Difference of Soil Water and Soil Salt for Various Vegetation Types in Desert-Oasis Crisscross Zone

基于10种不同植被种群,运用统计学方法,四象限评价法探讨古尔班通古特沙漠南缘土壤的水盐状况,为该区域天然植被恢复和重建中植物物种选择提供参考依据。结果表明:该区域植被类型不同,土壤盐分、土壤含水量明显不同。鸡爪芦苇种群下的土壤水分最多,苦豆子种群下的土壤水分最少;盐节木种群下的土壤盐分最高,骆驼蓬下的土壤含盐量最低。表层土壤含水量少,除芨芨草种群外其余各层随土壤深度的增加含水量增加;土壤盐分表聚现象不明显,次表层含盐量最高。盐节木耐盐性最好,鸡爪芦苇所需含水率最大,大叶补血草对水盐的需求较均衡。

Based on 10 different vegetation species, the statistical and four quadrant evaluation methods were used to explore the conditions of soil water and soil salt in the southern Gurbantunggut Desert, to provide the reference basis for the plant species in the region＇s natural vegetation restoration and reconstruction. Results showed that the soil salt content and the soil moisture content were significantly different with various vegetation types in this region. The soil moisture content was great in Phragmites species, while the least one exist in Sophora alopecuroides species; the soil salt content was the highest in Halocnemum strobilaceum species , while the lowest one in Peganum harmala species. Meanwhile, the surface soil water content was less, except for achnatherum splendens species, the moisture content increased with soil depth. The soil salt upper-accumulated phenomenon was not significant, and subsurface salt con- tent was the highest. Halocnemum strobilaceum had a great salt resistance, Phragmite needed maximum water, and Limonium gmelinii demands for water and salt was equilibrated.