Threshold value (for ecosystems)

 Threshold value (for ecosystems)

1) Minimum request level.  The lowest level of living things' vital desire to survive. For example, some fruit crops can live to a certain minimum temperature, and at a temperature below it, they die. Some plants need a certain degree of temperature to start the vegetation period by bursting their buds, which is 100C for coniferous trees and 50C for herbaceous plants.

2) In the morphological sense, the transition boundary of one field to another field. For example, the border of the Aegean and Central Anatolia regions coincides with the border where the plateaus begin.