Final answer:
The farmland was undergoing secondary succession, where pioneer species colonize the area after a disturbance, leading to the establishment of a stable community.
Explanation:
Secondary succession was taking place in the farmland. Secondary succession occurs in a formerly inhabited area that was disturbed, like after a drought. Pioneer species initially colonize the area, followed by intermediate species and eventually leading to the establishment of a stable community resembling the one before the disturbance.
Learn more about ecological succession here:
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