Ricardo- The heath refers to areas that grow heather. These areas are quite rare in the UK but the geology and the way they behave follows a similar pattern. The soils are basically always acidic but they can range from silty to sandy, the soil is typically 3.5-6.0 ph never highe. Erica carnea will colonise in the thin infertile soils, its also good for a number of plants and the trees which we tend to like for golf courses (those that dont produce big leaves) Birch, Pine and Oak will all do well. Heaths lend themselves to being great for golf by default as linksland they are not good for producing great crops, not much likes ph levels in the threes or fours except finely bladed fescues and impoversish plants. Parkland by contrast could be on any soil and generally refers to trees, in theory Parkland could be on heathland if left uncontrolled, aka Sunningdale so your not so far wrong really, but as has already been said it is all about the soil.