a soil test should be carried out to establish pH, nutrient levels, moisture status, salinity levels and the presence of toxic irons, all of which will influence the range of species that will grow.?Climatic conditions should also be studied, including the frequency of drought and waterlogging.?Topographic influences on the local climate are important — for example, differences in temperature and moisture between sunny and shady slopes, and frost hollows(霜冻洼地).?Topography also determines the location of dry and wet sites through its effect on movement of water through the soil.?Plant species should be selected for their properties of rapid growth, toughness in respect of diseases and pests, ability pete with less desirable species and adaptability to the local soil and climatic conditions.
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