Soil%20Compaction - Compaction%20refers%20to%20the%20reducition%20of%20pore%20space%20in%20the%20soil%20medium.%20Trees%20need%20ample%20pore%20space%20in%20the%20soil%20to%20be%20able%20to%20respirate%20%28breathe%29%20appropriately.%20When%20this%20space%20in%20the%20soil%20is%20closed%20up%2C%20the%20tree%20is%20not%20able%20to%20facilitate%20these%20necessary%20gas%20exchanges%20for%20various%20biological%20processes.%20This%20results%20in%20reduced%20growth%2C%20vigor%2C%20and%20increased%20suceptibility%20to%20insects%20and%20disease.