## 3 Results
Figure 3: Diurnal minimum temperatures (**a**), temperature distributions (**b**), temperature trends on December 19 (**c**), and daily mean humidity (**d**) at grapevine branches under different overwintering treatments (A: soil-covered striped cloth, B: striped cloth, C: sandwiched striped cloth, D: thickened striped cloth, E: double-layer striped cloth, F: heat-insulating striped cloth, G: heat-insulating sandwich striped cloth). The analysis of the soil moisture trends at a depth of 20 cm during the overwintering process revealed an overall decreasing trend in soil moisture content across all the treatments. The rate of moisture decrease was used to evaluate and compare the moisturizing ability of each treatment at this depth (Figure 5). The moisture retention capacities were ranked as follows: double-layer striped cloth (treatment E) > sandwiched striped cloth (treatment C) > thickened striped cloth (treatment D) > heat-insulating sandwiched striped cloth (treatment G) > heat-insulating striped cloth (treatment F) > striped cloth (treatment B) > soil-covered striped cloth (treatment A). The striped cloth treatment demonstrated relatively low moisturizing performance, while the treatments such as the double-layer striped cloth, thickened striped cloth, sandwiched striped cloth, heat-insulating striped cloth, and heat-insulating sandwich striped cloth exhibited higher moisturizing performance, with improvements ranging from 26% to 27% compared to the striped cloth treatment. Figure 4: Daily minimum temperature and temperature drop rate at 20 cm underground during different wintering treatments (A: soil-covered striped cloth, B: striped cloth, C: sandwiched striped cloth, D: thickened striped cloth, E: double-layer striped cloth, F: heat-insulating striped cloth, G: heat-insulating sandwich striped cloth). Figure 5: Daily average humidity and humidity decrease rate at 20 cm underground during wintering with different wintering treatments (A: soil-covered striped cloth, B: striped cloth, C: sandwich striped cloth, D: thickened striped cloth, E: double-layer striped cloth, F: heat-insulating striped cloth, G: heat-insulating sandwich striped cloth). Changes in Temperature and Humidity at 40 cm Below Ground Level During Overwintering in Different Treatments  
The analysis of the daily minimum temperatures at a depth of 40 cm below the soil surface revealed that all the treatments maintained temperatures above the critical threshold for root freeze damage throughout the overwintering process, exhibiting a decreasing trend. The rate of temperature decrease was used to evaluate the thermal insulation capacity at this depth (Figure 6). The thermal insulation properties were ranked as follows: heat-insulating sandwich striped cloth (treatment G) > sandwiched striped cloth (treatment C) = double-layer striped cloth (treatment E) > heat-insulating striped cloth (treatment F) > soil-covered striped cloth (treatment A) > striped cloth (treatment B) > thickened striped cloth (treatment D). These results indicate that even at a depth of 40 cm, the striped cloth treatment demonstrated poor thermal insulation, with only the thickened striped cloth performing worse. The reduced difference in the rates of temperature decrease between the treatments at this depth suggest that the influence of solar radiation and external ambient temperatures on the temperature at this depth was diminished. The soil moisture at a depth of 40 cm below the ground during the overwintering period exhibited a decreasing trend, similar to that observed at 20 cm. The moisture reduction rate was used to evaluate the moisturizing capacity of each treatment (Figure 7). The treatments were ranked in descending order of moisture retention ability as follows: heat-insulating sandwich striped cloth (treatment G) > striped cloth (treatment B) > double-layer striped cloth (treatment E) > sandwiched striped cloth (treatment C) > heat-insulating striped cloth (treatment F) > thickened striped cloth (treatment D) > soil-covered striped cloth (treatment A).