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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Spatio-temporal variations determine plant-microbe competition for inorganic nitrogen in an alpine meadow
Auteurs :	Xingliang Xu, Auteur ; Hua Ouyang, Auteur ; Andreas Richter, Auteur ; Wolfgang Wanek, Auteur ; Guangmin Cao, Auteur ; Yakov Kuzyakov, Auteur
Type de document :	Article
Dans :	Journal of Ecology (99(2) MAR 2011)
Article en page(s) :	563-571
Langues:	Anglais
Résumé :	1. Plant microbe competition for available nitrogen (N) has been suggested to be an important mechanism controlling N limitation of plants in a variety of ecosystems. However, spatio-temporal patterns of competition between plants and microbes for soil N remain unclear. 2. Short-term N-15 tracer experiments were conducted during a growing season (July, August and September) in an alpine meadow on the Tibetan Plateau to unravel spatio-temporal patterns of plant microbe competition for NH4+ and NO3-. 3. Alpine plants were poorer competitors than soil microorganisms for inorganic N in July compared with August and September. Occupation of soil volume by roots and root density (high in August and September) played a greater role in plant microbe competition than air temperature or precipitation (high in July). 4. In topsoils (0-5 cm, highest root density), alpine plants effectively competed with soil microorganisms for N and showed a preference for (NO3-)-N-15, while soil microorganisms that preferentially took up (NH4+)-N-15 out-competed plants below 5 cm soil depth (lower root density). Competition between plants and soil microorganisms for inorganic N strongly depended on root density (P

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