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Canopy research is a relatively new scientific field which was hampered for a long time by lack of means of access to the tree canopies and lack of appropriate means of housing researchers. Climbing gear, tree houses , canopy walkways , cranes , airships and inflatable platforms resting on the treetops have lately overcome these barriers.
Stephen C. Sillett (born March 19, 1968) is an American botanist specializing in old growth forest canopies. As the first scientist to enter the redwood forest canopy, he pioneered new methods for climbing, exploring, and studying tall trees. [1]
Canopy trees are able to photosynthesize relatively rapidly with abundant light, so it supports the majority of primary productivity in forests. The canopy layer provides protection from strong winds and storms while also intercepting sunlight and precipitation, leading to a relatively sparsely vegetated understory layer.
Nalini Nadkarni (1954) is an American forest ecologist who pioneered the study of Costa Rican rain forest canopies.Using mountain climbing equipment to make her ascent, Nadkarni first took an inventory of the canopy in 1981, followed by two more inventories in 1984. [1]
The tree falling also opens up the canopy for light entrance, which can support the growth of other trees and plants. After a disturbance, there are several ways in which regeneration can occur. One way, termed the advance regeneration pathway, is when the primary understory already contains seedlings and saplings.
Crown closure, also known as canopy closure, is an integrated measure of the canopy "over a segment of the sky hemisphere above one point on the ground". [1] Crown cover is the proportion of a stand covered by the crowns of live trees. A forest stand can have a crown cover of 100% and a crown closure less than 100%.
Canopy of D. aromatica at the Forest Research Institute Malaysia displaying crown shyness Trees at Plaza San Martín (Buenos Aires), Argentina. Crown shyness (also canopy disengagement, [1] canopy shyness, [2] or inter-crown spacing [3]) is a phenomenon observed in some tree species, in which the crowns of fully stocked trees do not touch each other, forming a canopy with channel-like gaps.
Canopy conductance, commonly denoted , is a dimensionless quantity characterizing radiation distribution in tree canopy. By definition, it is calculated as a ratio of daily water use to daily mean vapor pressure deficit (VPD). [ 1 ]