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以泰兴香荷芋为试验材料,设置颜色及厚度不同的地膜覆盖10个处理,研究地膜覆盖对不同深度土壤温度的影响,并运用TOPSIS法对不同时刻、不同深度的土壤温度进行了综合分析。结果表明:不同地膜覆盖处理间的土壤温度在不同时刻(5∶00、8∶00、14∶00)均有极显著差异,且地下5 cm、10 cm、15 cm处的土壤温度也有极显著的差异,白色地膜覆盖处理下的土壤温度最高,其次为黑膜覆盖,露地处理下土壤温度最低,且土壤温度与黑色地膜厚度存在显著正相关;从生育进程看,各处理不同深度的土壤温度在出苗期、4叶期、8叶期有显著差异;基于TOPSIS法的土壤温度综合评价结果表明,各地膜处理土壤温度与最优解的接近度的大小顺序为:旋耕15μm白色地膜>旋耕20μm白色地膜>旋耕30μm白色地膜>旋耕6μm白色地膜>旋耕30μm黑色地膜>平作30μm黑色地膜>旋耕20μm黑色地膜>旋耕露天>平作露天>旋耕15μm黑色地膜,表明旋耕条件下,15μm白色地膜覆盖处理在土壤温度的综合评价中评价分数最高。
Ten kinds of plastic film mulching with different color and thickness were set up to study the effects of plastic film mulching on soil temperature at different depths. The soil temperature at different times and depths was analyzed by TOPSIS method. The results showed that the soil temperature varied significantly between treatments at different time points (5:00, 8:00 and 14:00), and the soil temperatures at 5 cm, 10 cm and 15 cm below ground were also significantly different The soil temperature under white film mulching was the highest, followed by the black mulching. The soil temperature was the lowest under the field exposure, and the soil temperature had a significant positive correlation with the black film thickness. From the perspective of fertility, the soil temperature at different depths The results of soil temperature comprehensive evaluation based on TOPSIS showed that the order of the closeness of film soil temperature and the optimal solution was rotary tillage 15μm white film> spin Plowing 20μm white film> Rotating 30μm white film> Rotating 6μm white film> Rotating 30μm black film> Flattening 30μm black film> Rotating 20μm black film> Rotating open field> Flattening open field> Under the conditions, the 15μm white film covering treatment had the highest evaluation score in the comprehensive evaluation of soil temperature.