Argentina's military government suffered an embarrassing linkage of its controversial human rights record to the Falklands crisis today when British authorities announced that one of the Argentine soldiers captured on the island of South Georgia April 25, Capt. Alfredo Astiz, was wanted for questioning by French and Swedish authorities.

Human rights sources here said that Astiz had been linked to the 1977 disappearance of two French nuns, one of whom, Alicia Domon, had been working with the families of persons who disappeared during the military's campaign against internal opponents.

Domon was seized by a group of plainclothesmen on Dec. 8, 1977, while she was attending a meeting of a human rights group raising money to publicize their cause. Witnesses to the event who still work in human rights groups here said 13 other persons were abducted at the same time at the meeting at a Buenos Aires church.

Leonie Duquet, the second French nun, was detained two days later on Dec. 10 and a leader of the rights group, Mothers of the Plaza de Mayo, disappeared on the same day in events that were also linked by unconfirmed reports to Astiz, according to human rights group members.

Human rights sources said Astiz was wanted for questioning by Swedish authorities for the Jan. 27, 1977, shooting death of Dagmar Hagelin, a young Swedish woman then living in Buenos Aires.

Members of the Mothers of the Plaza de Mayo group said that shortly before the December 1977 events, a young blond-haired man joined their group, saying that he had a sister who had disappeared. The man attended several meetings and then dropped from sight after the disappearance of the two nuns, the group members said, adding that they later received unconfirmed reports he was a military agent named Astiz.