Does barrel cactus have a verry deep roots?

The barrel cactus [Echinocactus and Ferocactusspp] has spreading, shallow, fibrous roots. It's the only kind of roots that a cactus plant has. The roots need to spread out in search of rare soil moisture. They also need to be shallow to catch the drops of dew, fog, or rain that drip to the ground and into the soil. They need to be fibrous, too, to take in water and dissolved nutrients, to send up the stem for the photosynthetic interaction with sunlight.