Trees, 2017, Vol.31(4), pp.1189-1202
To access, purchase, authenticate, or subscribe to the full-text of this article, please visit this link: http://dx.doi.org/10.1007/s00468-017-1537-3 Byline: Bin Hu (1,2), Minghua Zhou (3,6), Silvija Bilela (2), Judy Simon (2,7), Michael Dannenmann (3), Xiping Liu (4), Saleh Alfarraj (5), Lin Hou (1), Hui Chen (1), Shuoxin Zhang (1), Klaus Butterbach-Bahl (3), Heinz Rennenberg (2,5) Keywords: Root nitrogen uptake capacity; Soil microbial biomass; Larix; Quercus; Picea; Qinling Mountains Abstract: Key Message Root N uptake capacity and soil C, N status indicate superior performance of a mixed forest stand with Larix and Quercus compared with the monocultures of Picea and Larix under N limitation condition. Abstract Nitrogen availability and uptake capacity are key factors influencing forest growth and development in N-limited terrestrial ecosystems. With the aim to determine how species and forest management affect tree N nutrition, we conducted root N uptake experiments as well as soil N analyses at three forest stands with different native and introduced tree species (i.e. Larix principis-rupprechtii Mayr., Quercus aliena var. acutiserrata Maxim. ex Wenz. and Picea wilsonii Mast.) and two management approaches (i.e. monoculture versus mixed stand) in the Qinling Mountains of China. Across the native and introduced species studied, in general, investigated trees take up both, organic and inorganic N compounds, but prefer organic N (Gln- and Arg-) over inorganic NH.sub.4 .sup.+--N. The introduced conifer species (L. principis-ruprechtii) showed higher root N acquisition capacities compared to a native conifer species (P. wilsonii) under N-limited conditions. Moreover, the mixed forest stand with L. principis-ruprechtii and Q. alinea var. acutesserata accumulated more nitrogen in soil pools and showed improved C and N retention capability through the whole soil profile as compared to the monocultures of P. wilsonii or L. principis-ruprechtii. Similar acquisition strategies were observed for specific N sources (i.e. organic versus inorganic) across all investigated tree species. Still the introduced species Larix exhibited a superior root N acquisition capacity and, therefore, may be a good candidate for afforestation programs in the studied region. The present results underpin the significance of forest management practices that achieve a mixed species structure with broadleaved tree species such as Quercus for restoration of soil C and N pools in order to stabilize forest ecosystems and to achieve sustainable forest development. Author Affiliation: (1) College of Forestry, Northwest A&F University, Yangling, Shaanxi, China (2) Chair of Tree Physiology, Institute of Forest Sciences, University of Freiburg, Freiburg, Germany (3) Institute for Meteorology and Climate Research, Atmospheric Environmental Research (IMK-IFU), Karlsruhe Institute of Technology (KIT), Garmisch-Partenkirchen, Germany (4) College of Life Sciences, Northwest A&F University, Yangling, Shaanxi, China (5) College of Sciences, King Saud University, Riyadh, Saudi Arabia (6) Institute of Bio- and Geosciences -- Agrosphere (IBG-3), Forschungszentrum Julich GmbH, Julich, Germany (7) Chair of Plant Physiology and Biochemistry, Department of Biology, University of Konstanz, Konstanz, Germany Article History: Registration Date: 28/02/2017 Received Date: 18/08/2016 Accepted Date: 10/02/2017 Online Date: 21/03/2017 Article note: Communicated by K. Masaka. Bin Hu and Minghua Zhou contributed equally to this work.
Root nitrogen uptake capacity ; Soil microbial biomass ; Larix ; Quercus ; Picea ; Qinling Mountains
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