Rewrite rule from other directory to wordpress blog

Hallo, my blog is in a lower directory on my homepage:
http://www.stayinbuenosaires.com/blog/

The rewrite rule for links inside the blog works perfect:

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /blog/
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /blog/index.php [L]
</IfModule>

Now i wanted the same for links from the home directory.
I have a .htaccess file in root with the ruleabove too but how ever i change the directory in the rule i got a error when i click a link.
I wanted that the links from the home page look like the links inside the blog:
http://www.stayinbuenosaires.com/blog/about/ instead of
http://www.stayinbuenosaires.com/blog/?page_id=2