The unarmed CH-3s also have been used since July in the southern African country of Zambia to prospect for mineral resources. The operation in the African nation is the first time large Chinese-made drones, unlike the small consumer models made by Chinese firms like DJI, performed a civilian mission in a foreign country and also the first time an African nation used an unmanned aircraft to explore for mines, the academy said.
More than 350 scientists collected data from around 600,000 samples taken from more than 17,000 plots of land, making it the largest field survey ecological project in the world, Fang said.
Susan Trumbore, a PNAS editor, said the Chinese papers have made "a novel contribution by demonstrating a direct link between policy and outcomes for soil carbon in agricultural soils".
"Skilled workers should be duly remunerated and held in high esteem by the general public," he said.
The findings include 189 ruins sites, 43 tombs, 15 ancient buildings and 16 places with cultural relics from the modern era. The heritage date back to as early as the Neolithic Period.
Shen Changyu, director of the State Intellectual Property Office, made the remarks at the sideline of the ongoing annual session of the national legislature.