Your perl one-liner does not do anything because your quotation marks are in the wrong place. Simply using the -w option would have alerted you to this:

$ perl -we '"system(/usr/bin/perl /root/test.pl)"'
Useless use of a constant (system(/usr/bin/perl /root/test.pl)) in voi
+d context at -e line 1.
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If you correct the one-liner you would have more luck. Although, why you call a perl script to invoke a shell to call another perl script is not clear. Perhaps if you can explain what it is you are actually trying to accomplish someone could suggest an alternative approach.