| In order to clarify the regulation mechanism of micro-climate on the movement of water and salt in saline soil with straw covering, different straw mulching (0, 0.3, 0.6, 0.9 kg·m-2 and 1.2 kg·m-2, denoted by CK, A, B, C, and D, respectively) were simulated through indoor soil column experiments during the evaporation process (0~17 717 min.) for saline soil, and the effects of near-surface micro-meteorological factors (surface soil temperature, air temperature, and relative humidity), turbulent heat exchange, evaporation rate, and water and salt movement were analyzed. The results showed that straw mulching effectively increased the surface soil temperature and the near-surface air temperature. The surface temperature of A, B, C, and D increased by 21.9%, 27.4%, 27.2%, and 33.5%, respectively, over CK. The air temperature at 15 cm above the surface increased by 1.02%, 0.59%, 0.95%, and 1.54% compared to CK; without external heat source replenishment, the turbulence exchange coefficients of A, B, C, and D treatment were 73.3%, 62.8%, 29.9%, and 51.7% lower, the turbulent heat flux was 80.2%, 70.6%, 52.8%, and 69.6% higher, and the latent heat flux was 84.9%, 79.4%, 57.6%, and 69.8% lower than those of CK, respectively, with significant difference. The inhibitory effect of soil evaporation rate was mainly in the early stage of evaporation, 0~10 000 min, evaporation rate of CK was 12.4%, 52.5%, 26.7%, and 60.3% lower than that of A, B, C, and D, respectively. To a certain extent, straw mulching could suppress the accumulation of soil salt to the surface, and with the increase of straw coverage, the salt content of the surface layer 0~1 cm soil layer showed a decreasing trend. |