Motor innervation to the stomach is classified as

The answer to this question would be: visceral motor

The muscle in the stomach is not consciously moved. The muscle regulated automatically by the nervous system based on some mechanism like other organs. The things that can influence the muscle would be when the autonomous nervous system is activated. This kind of motor innervation is called visceral motor. 

Since the wind is partially blocked by the trees, the soil will not be carried away by the wind too quickly.