御寒防冻 ,由于雪层中含有充分的空气 ,是热的不良导体 ,它即可防止土壤中的热量向外扩散 ,又能阻止冷空气侵入下层土壤 ,使土壤中的温度较为稳定 ,对越冬果树有防寒保温作用。培肥地力 ,空气中的氨气、硫化氢、二氧化硫和二氧化碳等对果树有利的浮游气体能被雪水吸收 ,融化后 Cold frost, because the snow layer contains sufficient air, is a bad conductor of heat, which can prevent the spread of heat in the soil out, but also to prevent cold air intrusion into the lower soil, the soil temperature is relatively stable, the winter fruit trees A cold insulation effect. Soil fertility, ammonia in the air, hydrogen sulfide, sulfur dioxide and carbon dioxide and other beneficial floating fruit trees can be absorbed snow water, after melting