Answer
The microclimate of the stream corridor with trees will be more humid, cooler, and have more shade. The microclimate of the unplanted agricultural field will be less humid, warmer, and receive more sunlight.
Work Step by Step
The stream corridor will be more moist because of evaporation of the water from the stream. The stream corridor will be cooler because it has water, which resists drastic changes in temperature. The stream corridor will be more shady because it has trees while the unplanted agricultural field does not have much vegetation.