NAIROBI — The Italian-born author and conservationist Kuki Gallmann was shot at her Kenyan ranch and airlifted for treatment after herders invaded in search of pasture to save their animals from drought, officials said Sunday.

Gallmann, known for her best-selling book ‘‘I Dreamed of Africa,’’ which became a movie by the same name starring Kim Basinger, was patrolling the ranch in Laikipia when she was shot in the stomach, local police chief Ezekiel Chepkowny said.

Gallmann, 73, had been with rangers from the Kenya Wildlife Service, assessing damage to her property Saturday by arsonists who burned down buildings at one of Laikipia Nature Conservancy’s tourism lodges, said Laikipia Farmers Association chairman Martin Evans.

After the attack, the rangers took her to a location where she could be airlifted to Nanyuki town, Evans said. British Army medics attended to her before she was airlifted to the capital, Nairobi, he said.

On Sunday night, Evans said Gallmann was in stable condition after surgery but had serious injuries.

Richard Constant, the association’s deputy chairman, said suspicion falls on herders from the Pokot community who have invaded Gallmann’s ranch several times. Lodges belonging to Gallmann were burned by the herders last month.

This East African nation faces a drought that has affected half of the country and has been declared a national disaster.

Herders, whose livelihoods depend on cattle, and large-scale farmers in parts of Kenya’s Rift Valley have been desperately waiting for seasonal rains that were to start last month to ease the drought, as well as conflicts over grazing land in which more than 30 people have died.

Kenya’s military and police have been working to disarm and drive the hundreds of herders and their animals out of ranches they’ve invaded, but the actions appear to have escalated violence. When the military and police drive herders from one ranch, they move into another, the farmers’ association said.

The association has accused politicians campaigning for the August elections of inciting the herders to invade the ranches, saying the owners’ leases have come to an end and that herders can take over the land and distribute it among themselves.

Opposition leader and former prime minister Raila Odinga said ranch owners deserve protection under the law like all Kenyans, citing “apparent helplessness of the government that is clearly unable or unwilling to bring these attacks to a stop.’’