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Drylands are characterized by a scarcity of water, which affects both natural and managed ecosystems and constrains the production of livestock as well as crops, wood, forage and other plants and affects the delivery of environmental services. For millennia, drylands have been shaped by a combination of low precipitation, droughts and heat ...
Drylands are zones where precipitation is balanced by evaporation from surfaces and by transpiration by plants ( evapotranspiration ). [1] . The United Nations Environment Program defines drylands as tropical and temperate areas with an aridity index of less than 0.65. [2] . One can classify drylands into four sub-types: Dry sub-humid lands.
31 de oct. de 2021 · Drylands and land degradation. Drylands are found in tropical and temperate latitudes and account for 41.3% of the global terrestrial area. Drylands can be classified into four types - dry sub-humid, semi-arid, arid and hyper-arid lands - and encompass a variety of ecosystems.
Trees, forests and land use in drylands. The first global assessment. Why are drylands so important? Drylands are a vital but often overlooked resource. Those that live in drylands depend on forests and other wooded lands, and grasslands for their livelihoods and to meet basic needs.
Land degradation in drylands is known as desertification, and is the loss of the biological or economic productivity of land. Desertification reduces agricultural output, contributes to droughts and increases human vulnerability to climate change.
29 de nov. de 2016 · Science. Dryland Ecosystems. By Drought November 29, 2016. Overview. Drylands are arid and semi-arid zones around the world where water resources are scarce. In the U.S., 40 percent of the land is considered dryland.
Alongside ambitious emission cuts, countries can restore dryland ecosystems and sustainably manage land to address climate change in drylands. Drylands are particularly affected by climate change through changing rainfall patterns and land degradation, which reduces the ability of species and people to cope with dryland conditions.
