AMMAN (Reuters) - King Abdullah swore in a new government on Thursday led by reformist politician Abdullah Ensour and charged with preparing for Jordan's first post-Arab Spring parliamentary elections.

Prime Minister Ensour, 73, has held a string of senior ministerial posts in more than two decades of public office but has backed opposition calls for wider reforms.

He was appointed by the king on Wednesday to replace Fayez al-Tarawneh, a week after the tribal parliament was dissolved half-way through its four-year term. Elections must be held within four months.

(Reporting by Suleiman Al-Khalidi; Editing by Angus MacSwan)