- facilitation
- Positive interaction between two species or individuals. The presence of one partner promotes the presence of the other partner.
- fellfield
- A largely barren, high elevation plain dominated by patches of graminoid and shrub vegetation and cryptogams
- fen
- Open wetland area, more mineral-rich than a bog due to groundwater inputs; alkaline rather than acidic
- fertilisation
- This word has two meanings implicit from context:
(a) addition of fertiliser (mineral nutrients)
(b) successful gametogamy (e.g. male gamete fusing with the egg cell after flower pollination)
- fertiliser
- Mineral plant nutrient (solid or dissolved salt)
- festucoid
- A leaf shaped like those in many members of the grass genus Festuca, i.e. narrow and furrowed
- firn
- A permeable aggregate of small ice grains with densities between 0.55 and 0.82 at which density glacial ice begins
- flavonoid
- Yellowish, UV-absorptive solute found predominantly in leaf epidermis
- flow
- The movement of glacial ice as the whole mass of ice slips along the ground, or along shear planes in the ice. Glacial ice moves in two ways:
(a) Ice behaves as a brittle solid until
(b) the pressure is equal to the weight of 50 meters (165 feet) of ice; then it becomes plastic and flow begins.
- folic
- The folic horizon in a soil is a surface horizon which consists of well aerated organic soil material.
- forb
- A herb
- freezing front
- The advancing boundary between frozen (or partially frozen) ground and unfrozen ground
- frost blister
- A seasonal frost mound produced through doming of seasonally frozen ground as subsurface water accumulates under elevated hydraulic potential during the progressive freezing of the active layer
- frost mound
- Any mound-shaped landform produced by ground freezing combined with accumulation of ground ice due to groundwater movement or the migration of soil moisture
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