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Big island means healthier trees
Here is a parking lot constructed on a compacted clay soil. The two trees on the left and center (blue arrows) are larger and darker green than the tree on the right. The stressed tree on the right was planted in a tiny island whereas the healthier ones were in alarger island.
The trees in the larger island were able to expand their root system into a much larger volume of soil. The root system on the struggling tree was probably confined to the soil in the small island.
