I do not see a connection to owning land and voting. What is so special about owning land?
It is something you should look into. Owning land, and only land owners being able to vote does a number of things. One being that it keeps people who do not pay taxes into the coffers of the government, from decisions of when, and how taxes should be applied. If only land owners were voting... They would literally be voting on taxing themselves; and as such would be hesitant to increase taxes unless there was a very good reason to do so. (Keep in mind there was no income tax back then, nor should there be now. That wasn't part of the design.)
Secondly It keeps non contributors from making legal determinations as to how the contributors money is spent. Parasites will always vote to promote their own interests at the cost of the host.
But there are many more reasons...