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

Accueil du site → Brèves → Brèves 2020 → How do desert plants respond to variations of nitrogen and water in arid regions ?

How do desert plants respond to variations of nitrogen and water in arid regions ?

Phys.org/news (DECEMBER 21, 2020 )

Titre : How do desert plants respond to variations of nitrogen and water in arid regions ?

Groundwater and its nutrients sustain the deep-rooted phreatophytes. However, how phreatophyte seedlings respond to water and nutrients in topsoil before their roots reach groundwater remains unclear.

Phys.org/news (DECEMBER 21, 2020 )

Présentation
Moreover, nitrogen (N) enrichment fertilizes desert ecosystems, while drought limits the movement of soil nutrients. Little attention has been paid to the effects of their interactions on desert deep-rooted plants.

Researchers from the Xinjiang Institute of Ecology and Geography (XIEG) of the Chinese Academy of Sciences systematically studied how the two phreatophyte species seedlings, Alhagi sparsifolia and Calligonum mongolicum dominating in the southern margin of the Taklimakan desert, responded to variations of nitrogen and water by simulating N deposition and water stress.

They found that N and water independently or interactively influenced photosynthesis, drought tolerance, morphological characteristics, and the distribution pattern of biomass and nutrients among organs of the two plants.

These findings are helpful to further understand the water use pathways and nutrient response strategies of desert deep-rooted plant seedlings. They also provide an important scientific basis for the study of vegetation degradation mechanism and restoration technology in arid areas and the optimal management of desert ecosystems under the scenario of global climate change.

Source  : Li Yuan, Chinese Academy of Sciences

Annonce (Phys.org/news)

Page publiée le 25 juin 2021