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Crown closure and crown cover are two slightly different measures of the forest canopy and that determine the amount of light able to penetrate to the forest floor. 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".
Canopy mapping is the process whereby the positions and size of the branches within the canopy are mapped in three-dimensional space. [22] [23] [24] It is a labor-intensive process that usually reserved for only the most significant specimens. This is usually done from a set position or a series of positions within the tree.
Most seeds are not affected by light or darkness, but many photoblastic seeds, including species found in forest settings, will not germinate until an opening in the canopy allows sufficient light for the growth of the seedling. [2] Scarification mimics natural processes that weaken the seed coat before germination. In nature, some seeds ...
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The soil below the trays (to increase air moisture) and the soil in the trays themselves is kept moist but not waterlogged (=completely saturated). The trays the cuttings sit in are best placed on stones to prevent capillary action (as this can keep the soil inside the trays too wet). Soil in the trays should be kept at 85 to 95% saturation. [31]
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