This loophole is solved by making it that declaring the land as such status means the land is commited to that use for a minimum number of years that makes the

This loophole is solved by making it that declaring the land as such status means the land is commited to that use for a minimum number of years that makes the conservation meaningful. Something like a decade minimum with a high bar for converting it for other usage afterwards. Farmers in the UK for instance already have some incentives to leave some fields alone.