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For example, vanilla vines need 50% shade and, in deforested areas of Mexico, this is provided by shade houses of 1,000 – 10,000 square metres. These have tree-like support posts or actual living trees. From these, shade cloth walls of 3–5 metres height are suspended and these are black or red to cut the luminosity by half. [2]
In seasonally snow-covered zones, winter albedos of treeless areas are 10% to 50% higher than nearby forested areas because snow does not cover the trees as readily. Deciduous trees have an albedo value of about 0.15 to 0.18 whereas coniferous trees have a value of about 0.09 to 0.15. [ 9 ]
[83] [84] Shade provided by trees planted in the desert also reduces evaporation of the sparse rainfall. [83] Yatir Forest is a part of the NASA project FluxNet , a global network of micrometeorological tower sites used to measure the exchanges of carbon dioxide , water vapor , and energy between terrestrial ecosystem and atmosphere .
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Nurseries may also specialize in one type of plant, e.g., groundcovers, shade plants, or rock garden plants. Some produce bulk stock, whether seedlings or grafted trees, of particular varieties for purposes such as fruit trees for orchards or timber trees for forestry.
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