8. In the boreal forest region, the vegetation type is gometimes different between norti-facing and south-facing slopes. For example, in Interior Alask cing slope is co covered by black spruce forest over er permafrost. In contrast, the south-facing slope is covered by deciduous broadleaf species on the permafirost-free soil. Explain the reason for it from the view of solar radintion and topography. (10 pt)

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