Mulch forms a barrier between the soil and the air. As a result, mulched soil will be cooler in the summertime. And in winter, it may not freeze as deeply as areas without mulch.

盖土形成土壤与空气之间的屏障，其结果是，被覆盖的土壤在夏季会较凉爽，而在冬季，不会让土壤像没有盖土的区域一样冻得那么深。

youdao

As a result, mulched soil will be cooler in the summertime. And in winter, it may not freeze as deeply as areas without mulch.

其结果是，被覆盖的土壤在夏季会较凉爽，而在冬季，不会让土壤像没有盖土的区域一样冻得那样严重。

youdao