There is hereby established a reserve in the general capital fund which shall be known and designated as the "Reserve for Open Space Acquisition." A separate bank account shall be opened and maintained for this purpose. Funds from the Reserve for Open Space Acquisition may, as directed by the Township Committee, be utilized to acquire vacant land, as well as land which has improvements upon it at the time of acquisition, where the principal purpose of the acquisition is to preserve open space, recreation, farmland preservation and/or historic preservation. In the event that the Township Committee shall find it appropriate to apportion the cost of acquisition between open space and improvements, it may do so and charge the Reserve for Open Space Acquisition for the approximate value that it deems appropriate relative to open space and the township's capital account for the value that it determines shall be attributed to improvements.