Except as hereinafter provided, all mortgages and deeds of trust upon land given to secure the payment of money, and all instruments of writing whereby a trustee is substituted under any such deed of trust, and all instruments of writing canceling or satisfying, or authorizing the cancellation or satisfaction of any such mortgage or deed of trust, shall be recorded separately from other instruments relating to land or records, and such records shall be called "records of mortgages and deeds of trust on land."