372.19  Preserves, refuges, etc., not tax-exempt.--No property acquired by purchase, lease, gift, contract to purchase or lease, or otherwise, under the provisions of this chapter, as state game lands, or any private lands used as game refuges, shooting grounds, privileges, hatcheries or breeding grounds for fish, game, birds or fur-bearing animals, except state-owned lands being used for the protection of game, fish or fur-bearing animals under the provisions of this chapter, shall be exempt from state, county or district taxation. Any contract, lease, gift or purchase of land for such purposes which attempts to exempt or partially exempt such property from taxation shall be null and void and of no effect.