I dont think they participate in donating yet. The way i see it is that they are trying to build up their country to be strong and powerful. Trying to compare with the U.S. Personally I think even these pictures was to show how well off they are and how well they are doing.
I never realized China would have a collection like that. To me it always seems like China tends to show off their military equipment and what not. more on the political side i guess. Back on topic that is a nice collection though.