In this study, the effect of low temperature stratification treatment on seed germination characteristics of Lycium ruthenicum under sodium salt stress was investigated, which provided technical support for ecological restoration in saline-alkali land.

Different concentrations of NaCl solution (0.2%-1.4%) and complex salt solution (0.4%-2.0%) were used to simulate the salt stress environment, and the germination parameters and recovery ability of seeds were systematically analyzed.

Under NaCl stress, under 0.4% NaCl treatment, the seedling emergence rate of low temperature stratification reached the peak (2.67% higher than that of control group), and the seedling emergence potential was 87.33%. The seedling emergence rate was the highest (68.00%) when 0.8% NaCl was treated at room temperature. Under combined salt stress, the seedling emergence potential of low temperature stratification reached 87.33% when 0.8% concentration was treated, and the seedling emergence index was significantly increased by 10.01% compared with the control group (P<0.05). The rate of room temperature drying was increased by 42.00% compared with control. After salt stress relief, the recovery germination rate of seeds increased with the increase of salt concentration, and reached the maximum value (38.10% and 39.44%) under 1.4% NaCl and 2.0% combined salt treatment, respectively, indicating that the seeds had the ability to recover from strong stress. The critical points of germination inhibition were 0.6% NaCl concentration and 0.8% compound salt concentration, and the germination index decreased significantly after the concentration exceeded (P<0.05).

By breaking seed dormancy and activating endogenous activity, low temperature stratification significantly enhanced the adaptability of Lycium ruthenicum to sodium stress. 0.4% NaCl and 0.8% compound salt were the optimal germination promoting concentrations under the two treatments, respectively. The research results provided key parameters for salt concentration regulation and pretreatment technology optimization of artificial cultivation of Lycium ruthenicum seedlings in saline-alkali land, and had important guiding significance for desertification control and ecological restoration practice.

The soil water content of different land types in the typical desert-oasis transition zone of Hexi Corridor and Zhangye City, Gansu Province were taken as the research objects to clarify the dynamic changes of soil water content and its relationship with climatic factors, and to reveal the spatial heterogeneity, dynamic changes and the interaction between soil water content and climatic factors in this region, and to provide theoretical basis local ecological protection and desertification prevention and control.

Through field sampling, indoor experiments, data analysis and processing, the changes of soil water content in the and saline-alkali areas of the desert-oasis transition zone in 0-20, 20-40, 40-60, 60-80 cm soil layers were analyzed. The correlation between climatic factors and soil water content was analyzed by Pearson bivariate correlation analysis and the response degree of soil water content to climatic factors was analyzed by grey correlation method.

1) The soil water content in the desert area generally low, with relatively high water content in the 0-20 cm soil layer, which decreased with the increase of depth; the soil water content in the-alkali area was generally high, with the water content increasing first and then decreasing with the increase of depth, and the water content in the 40-60 cm soil layer was the highest. The coefficient of variation of soil water content in different soil layers was at a low level of variation, indicating that its change was stable. The soil water content in the desert and saline-alkali areas showed different change trends in different months, with the highest water content in the 40-60 cm soil layer in the desert area and the lowest in the 60-80 cm soil layer; the highest water content in the saline-alk area was in the 40-60 cm or 60-80 cm soil layer, and the lowest was in the 0-20 cm layer; 2) Soil water content was significantly positively correlated with precipitation and relative humidity, and negatively correlated with wind speed, evaporation and temperature to varying degrees.ipitation and relative humidity had a significant effect on soil water content in the desert area, and precipitation and evaporation had a prominent effect in the saline-alkali, and the grey correlation analysis further revealed the greater effect of relative humidity and precipitation on soil water content in different soil layers.

The soil water content the desert area was generally low, while that in the saline-alkali area was generally high. The soil water content of different land types showed different change trends in months, and there were differences among the soil layers, but the overall change was relatively stable. The distribution of soil water content was affected by seasonal precipitation, evaporation soil texture.