.htaccess rewrite include all url variables

Question

I have a url that is rewritten using htaccess. The problem I'm running into is that some pages have a couple php get variables that aren't being included in the rewrite. Here is the code:

Options +FollowSymlinks
RewriteEngine on
RewriteOptions MaxRedirects=10
RewriteRule ^(.*)$ http://www.domain.org/$1?l=es [P,R=301,L]

Is it possible to simply include all variables in the re-write, or do I need to declare each specifically? Thanks.