Kooperativer Bibliotheksverbund

Berlin Brandenburg

and
and

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
Type of Medium
Language
Year
  • 1
    Language: English
    In: Applied and environmental microbiology, 01 September 2015, Vol.81(17), pp.5957-67
    Description: Beech (Fagus sylvatica), a dominant forest species in Central Europe, competes for nitrogen with soil microbes and suffers from N limitation under dry conditions. We hypothesized that ectomycorrhizal communities and the free-living rhizosphere microbes from beech trees from sites with two contrasting climatic conditions exhibit differences in N acquisition that contribute to differences in host N uptake and are related to differences in host belowground carbon allocation. To test these hypotheses, young trees from the natural regeneration of two genetically similar populations, one from dryer conditions (located in an area with a southwest exposure [SW trees]) and the other from a cooler, moist climate (located in an area with a northeast exposure [NE trees]), were transplanted into a homogeneous substrate in the same environment and labeled with (13)CO2 and (15)NH4 (+). Free-living rhizosphere microbes were characterized by marker genes for the N cycle, but no differences between the rhizospheres of SW or NE trees were found. Lower (15)N enrichment was found in the ectomycorrhizal communities of the NE tree communities than the SW tree communities, whereas no significant differences in (15)N enrichment were observed for nonmycorrhizal root tips of SW and NE trees. Neither the ectomycorrhizal communities nor the nonmycorrhizal root tips originating from NE and SW trees showed differences in (13)C signatures. Because the level of (15)N accumulation in fine roots and the amount transferred to leaves were lower in NE trees than SW trees, our data support the suggestion that the ectomycorrhizal community influences N transfer to its host and demonstrate that the fungal community from the dry condition was more efficient in N acquisition when environmental constraints were relieved. These findings highlight the importance of adapted ectomycorrhizal communities for forest nutrition in a changing climate.
    Keywords: Fagus -- Microbiology ; Fungi -- Metabolism ; Mycorrhizae -- Metabolism ; Nitrogen -- Metabolism
    ISSN: 00992240
    E-ISSN: 1098-5336
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Language: English
    In: Applied and Environmental Microbiology, Sept 1, 2015, Vol.81(17), pp.5957-5967
    Description: Study is conducted to test the hypothesis that ectomycorrhizal communities and the free-living rhizosphere microbes from beech trees from sites with two distinct climatic conditions shows differences in N acquisition. To test these hypotheses, young trees from dryer conditions and also from cooler, moist climate conditions are transplanted and it concluded that the ectomycorrhizal community influences N transfer to its host and fungal community from dry condition are efficient in N acquisition.
    Keywords: Mycorrhizae – Research ; Mycorrhizae – Physiological Aspects ; Beeches – Research ; Beeches – Physiological Aspects
    ISSN: 0099-2240
    Source: Cengage Learning, Inc.
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    Language: English
    In: Forest Ecology and Management, 01 July 2012, Vol.275, pp.60-67
    Description: ► We study two adult populations under different microclimatic conditions. ► We compare genetic diversity of the adult populations and their natural regeneration. ► Case study based on isozymes and microsatellite markers. ► We identified two “outlier microsatellite loci”, exhibiting directional selection. ► Natural selection account for different genetic structures of the adult populations. Due to its drought sensitivity, the performance and competitiveness of beech as a favoured species of forest management in Central Europe is likely to be negatively affected by the prognosticated climate change, leading to major impacts on the vulnerability of managed forest ecosystems. We studied the genetic differentiation between two populations from a relatively cold and wet northeast (representing the current climate of the majority of beech forests in Central Europe) and a relatively warm and dry southwest facing slope (representing the future climate of an increasing area covered by beech forests in Central Europe) at the same forest site to investigate the adaptation processes in these two populations under different microclimatic conditions. For this purpose, two different techniques, , nuclear microsatellites (neutral) and isozyme markers (adaptive), were applied to adult trees and natural regeneration at both slopes. Although microsatellites are considered to be neutral markers, they have been shown in several studies to give signals of selectively-driven changes. In our study, two of the five microsatellites behaved as “outlier loci”, exhibiting directional selection. Our results show independent of the technique applied that natural regeneration of the southwest slope and the natural regeneration and adult trees of the northeast slope were genetically closer than the adult trees from the southwest slope. Thus, we conclude that natural selection and potential adaptation account for genetic changes and different genetic structures among the two adult populations in this case study.
    Keywords: Fagus Sylvatica ; Climate Change ; Isozymes ; Nuclear Microsatellites ; Beech ; Adaptation ; Forestry ; Biology
    ISSN: 0378-1127
    E-ISSN: 1872-7042
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 4
    Language: English
    In: Forest Ecology and Management, 01 April 2017, Vol.389, pp.46-58
    Description: The Loess Plateau in China constitutes an area short of soil nitrogen and organic carbon due to local land degradation induced by various factors (i.e. long term changes of land use, climate conditions, and soil properties). The present study aimed to examine the effects of species and land management by afforestation on tree N acquisition capacity and soil N and C availability in degraded soils of the Loess Plateau area. We quantified root N uptake of inorganic and organic N sources as well as soil N and C availability, both at the tree species (i.e. L., L. and Carr.) and the land management (i.e. arable vs. monoculture vs. mixed afforested stands) levels. Our results indicated that afforestation improved soil N and organic C availabilities compared to abandoned arable land ( 〈 0.05). In particular, the presence of N -fixing enhanced root N concentrations (ca. 3.0 times) and soil NO (ca. 5.4 times), soil total N (ca. 1.9 times) and organic C (ca. 3.4 times) availabilities, but decreased soil NH (ca. −33%), microbial biomass carbon (ca. −74%) and nitrogen (ca. −54%) in the mixed stand compared to monoculture. Under the experimental conditions applied, the afforested trees preferred organic over inorganic N compounds as well as NO over NH ; in monoculture had a highest root amino acids N uptake capacities (i.e. 76.6 ± 7.7 nmol N (g fw) h for glutamine, 90.3 ± 8.9 nmol N (g fw) h for arginine) compared to other tree species whereas such high uptake capacities were largely repressed in the mixed stand with . Thus, in the Loess Plateau area, the inter-planting system of with N -fixing could improve the total soil N and organic C pools as well as plant N cycling compared to traditional arable land use and monoculture system. This study shows that inter-planting with economic fruit trees can be considered a successful strategy for soil regeneration by afforestation in future land management projects.
    Keywords: Root N Uptake ; Soil N Availability ; Monoculture ; Mixed Stand ; Degraded Soil ; Afforestation ; Forestry ; Biology
    ISSN: 0378-1127
    E-ISSN: 1872-7042
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 5
    Language: English
    In: PLoS ONE, 01 January 2016, Vol.11(7), p.e0158823
    Description: European beech forests growing on marginal calcareous soils have been proposed to be vulnerable to decreased soil water availability. This could result in a large-scale loss of ecological services and economical value in a changing climate....
    Keywords: Sciences (General)
    E-ISSN: 1932-6203
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 6
    Language: English
    In: Environmental and Experimental Botany, August 2017, Vol.140, pp.1-7
    Description: Nitrogen (N) input into food production is environmentally sensitive and economically significant, making efficient N use an important goal in agricultural practice and in plant breeding. In cereals, grain N concentration [N] is an important component of grain quality and nutritional value. Increasing atmospheric CO concentration [CO ] will not only stimulate growth and yield but also diminish grain [N], raising concerns about product quality and nutritional value. In this study we investigated how differences in root structure and function and agronomic properties between two bread wheat ( L.) cultivars affect N uptake and allocation to grains in a low rainfall environment, and whether such differences can indicate strategies to mitigate grain [N] decreases under increased [CO ]. Two cultivars (‘Silverstar’ and ‘Yitpi’) were chosen for their similar phenology and yields, but ‘Silverstar’ often has lower grain [N]. A glasshouse experiment showed contrasting root structure and function strategies between the two cultivars in response to soil N: ‘Yitpi’ but not ‘Silverstar’ responded to lower soil N with increased root growth, whereas ‘Silverstar’ but not ‘Yitpi’ showed increased N uptake per unit root mass in response to lower N. When grown in the Australian Grains Free Air CO Enrichment facility over multiple seasons both cultivars produced similar yields, but ‘Silverstar’ had consistently lower grain [N], smaller grains and greater harvest index. N uptake measurements with N label showed that wheat roots can take up nitrate, ammonium and glutamine, and also confirmed differences in uptake strategies between cultivars: ‘Silverstar’ roots had significantly greater uptake capacity than ‘Yitpi’ roots for ammonium. Whilst these results suggest that different strategies in response to variations in soil N supply could be related to grain N outcomes at this field site, there was no interaction with atmospheric [CO ] for any of the measured parameters. Regardless of cultivar, elevated [CO ] (550 μmol mol ) increased yields and decreased grain [N], but did not affect root uptake capacities for either N form. Contrasting root uptake strategies seem unrelated to grain [N] decrease under elevated [CO ], at least for this site.
    Keywords: Wheat ; Elevated Co2 ; Grain Protein ; Nitrogen Uptake ; Roots ; FACE ; Environmental Sciences ; Botany
    ISSN: 0098-8472
    E-ISSN: 1873-7307
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 7
    Language: English
    In: Trees, 2017, Vol.31(4), pp.1189-1202
    Description: 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.
    Keywords: Root nitrogen uptake capacity ; Soil microbial biomass ; Larix ; Quercus ; Picea ; Qinling Mountains
    ISSN: 0931-1890
    E-ISSN: 1432-2285
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 8
  • 9
  • 10
Close ⊗
This website uses cookies and the analysis tool Matomo. Further information can be found on the KOBV privacy pages