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hello
I have a question, could what I see on the ground be mold?
Maybe the whitening seen in the pictures could be different.
One is Portulacaria afra and the other is Ulmus parvifolia.
I bought both of them not long ago.
Can transplanting help remove mold?
I plan to plant the Portulacaria afra in a mixture of pumice/lava stone and Kiryu, and I plan to plant the ulmus in a mixture of lava stone, Kiryu, akadama and yamadori. Would this be good?? ?

Yes, it could be mold. But it could also be beneficial mychorizia. Impossible to tell from the photo.

However, if any of them are growing in portulacaria, you are watering too much. So decrease watering right away.

For chinese elm, I would bring it into a cool but frost free space for winter dormancy and decrease watering.

Do not urgently repot newly purshased trees, ever. They can go in the same soil for years. When it is time, reach out to someone experienced from your local area for suggestion on soil and help with your first repotting.

Looks like regular calcium deposits.