Rhizosphere processes affect the cycling and availability of nutrients.
Some of the rhizosphere processes were studied extensively for agricultural
crops and grasses grown under controlled conditions.
while
rhizosphere processes under tree species in natural
conditions are poorly understood. Limited research
suggests that inorganic N in rhizosphere soils may
be higher, lower or
similar to the bulk soil. Nutrient
cycling in the rhizosphere of trees under field
conditions may greatly differ from that of annual
plants and tree seedlings due to their differences
in nutrient requirement, soil conditions, as well
as growth period
However,
most studies on rhizosphere nutrient cycling of
trees were conducted on seedlings in microcosms
with few conducted in the field or forests