When the order has been entered by the county court and the commissioners have qualified as such under provisions of this subchapter, the lands in each county shall no longer be a part of the district as originally organized, and the power of the original district and the commissioners thereof to levy a tax on the lands in the county so separated from the original districts for the purposes provided in § 14-121-412 or for any other purposes shall terminate, but their authority as to all other lands located in the original district shall not be thereby affected.