Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Accueil du site → Brèves → Brèves 2022 → Effects of shrub encroachment on land surface temperature in temperate semi-arid areas of the Northern Hemisphere

Effects of shrub encroachment on land surface temperature in temperate semi-arid areas of the Northern Hemisphere

Phys.org/news (APRIL 18, 2022)

Titre : Effects of shrub encroachment on land surface temperature in temperate semi-arid areas of the Northern Hemisphere

Grassland ecosystems are being invaded by shrubs around the world, especially in temperate semi-arid regions of the Northern Hemisphere, under the influences of climate change and human activities.

Phys.org/news (APRIL 18, 2022)

Présentation
Shrub encroachment can affect not only the properties of grassland ecosystem, but also the regional or global climate.

In most of the northern temperate region, with the invasion of shrubs, soil moisture and nutrients gradually accumulate in the soil, creating the "fertile islands" of shrubs. The formation of "fertile islands" may cause soil material erosion among shrubs and loss of soil water and nutrients, which is not conducive to the growth of the surrounding grasslan In the extremely arid central Asia, shrub coverage and density in this area are low, and the conversion of grassland into shrubland does not cause large changes in bare soil fraction. As the shrub encroachment further aggravates the drought degree in this region, the decrease of soil water content leads to the increase of surface albedo and then the cooling effect.

Source  : Li Yuan, Chinese Academy of Sciences

Annonce (Phys.org/news)

Page publiée le 13 janvier 2023