There is hereby continuously appropriated to the Controller from the General Fund a sum sufficient to make the payments required by this chapter.

The payments provided by this chapter shall be made only when the value of each parcel of open-space land assessed under Sections 423, 423.3, 423.4, and 423.5 of the Revenue and Taxation Code is less than the value that would have resulted if the valuation of the property was made pursuant to Section 110.1 of the Revenue and Taxation Code, as though the property were not subject to an enforceable restriction in the base year.