ALBERT — All Library Books, journals and Electronic Records Telegrafenberg

Hits per page

hits 1 - 3 | 3 hits

Sorting

Electronic Resource

Growth, photosynthesis and storage of carbohydrates and nitrogen in Phaseolus lunatus in relation to resource availability (1995)

Mooney, H. A. ; Fichtner, K. ; Schulze, E.-D.

Springer

Oecologia 104 (1995), S. 17-23

add to mindlist on the mindlist

Details

ISSN: 1432-1939

Keywords: Carbohydrate ; Growth ; Nitrogen ; Phaseolus lunatus ; Storage

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Abstract Growth, photosynthesis, and storage of nitrogen (N) and total non-structural carbohydrates (TNC) of a perennial wild type and an annual cultivar of lima bean (Phaseolus lunatus) were examined at different light intensities and N supplies. Relative growth rate and photosynthesis increased with light and N availability. N limitation enhanced biomass allocation into root rather than into shoot, while light limitation enhanced growth of leaf area. The TNC concentrations increased with light intensity and thus with photosynthesis, while the concentrations of organic N and nitrate decreased. Increasing N supply had the opposite effect. Therefore, TNC and organic N concentrations were negatively correlated (r=−0.90). Pool size of N or TNC increased with N and light availability when either resource was non-limiting, but increased little or remained constant when either resource was limiting. Storage reached a minimum when both resources were supplied at an equal rate.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00365557

Permalink

	Location	Call Number	Expected	Availability

Others were also interested in ...

Paper (German National Licenses)

Fulltext

Electronic Resource

Above-ground biomass and structure of pristine Siberian Scots pine forests as controlled by competition and fire (1999)

Wirth, C. ; Schulze, E.-D. ; Schulze, W. ; [et al.]

Springer

Oecologia 121 (1999), S. 66-80

add to mindlist on the mindlist

Details

ISSN: 1432-1939

Keywords: Key wordsPinus sylvestris ; Siberia ; Biomass ; Self-thinning ; Forest fire

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Abstract The study presents a data set of above-ground biomass (AGB), structure, spacing and fire regime, for 24 stands of pristine Siberian Scots pine (Pinus sylvestris) forests with lichens (n = 20) or Vaccinium/mosses (n = 4) as ground cover, along four chronosequences. The stands of the “lichen” site type (LT) were stratified into three chronosequences according to stand density and fire history. Allometric equations were established from 90 sample trees for stem, coarse branch, fine branch, twig and needle biomass. The LT stands exhibited a low but sustained biomass accumulation until a stand age of 383 years. AGB reached only 6–10 kgdw m−2 after 200 years depending on stand density and fire history compared to 20 kgdw m−2 in the “Vaccinium” type (VT) stands. Leaf area index (LAI) in the LT stands remained at 0.5–1.5 and crown cover was 30–60%, whereas LAI reached 2.5 and crown cover was 〉100% in the VT stands. Although nearest-neighbour analyses suggested the existence of density-dependent mortality, fire impact turned out to have a much stronger effect on density dynamics. Fire scar dating and calculation of mean and initial fire return intervals revealed that within the LT stands differences in structure and biomass were related to the severity of fire regimes, which in turn was related to the degree of landscape fragmentation by wetlands. Self-thinning analysis was used to define the local carrying capacity for biomass. A series of undisturbed LT stands was used to characterise the upper self-thinning boundary. Stands that had experienced a moderate fire regime were positioned well below the self-thinning boundary in a distinct fire-thinning band of reduced major axis regression slope −0.26. We discuss how this downward shift resulted from alternating phases of density reduction by fire and subsequent regrowth. We conclude that biomass in Siberian Scots pine forests is strongly influenced by fire and that climate change will affect ecosystem functions predominantly via changes in fire regimes.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/s004420050908

Permalink

	Location	Call Number	Expected	Availability

Others were also interested in ...

Paper (German National Licenses)

Fulltext

Electronic Resource

AlkaliammingraphitverbindungenProfessor Walter Hieber zum 60. Geburtstage gewidmet (1955)

Rüdorff, W. ; Schulze, E. ; Rubisch, O.

Weinheim : Wiley-Blackwell

Zeitschrift für anorganische Chemie 282 (1955), S. 232-240

add to mindlist on the mindlist

Details

ISSN: 0044-2313

Keywords: Chemistry ; Inorganic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: Bei der Einwirkung von in flüssigem Ammoniak gelöstem Lithium, Natrium, Kalium, Rubidium und Cäsium auf Graphit oder bei der Umsetzung der bekannten Alkaligraphitverbindungen mit flüssigem NH3 entstehen sehr reaktionsfähige Graphitverbindungen, in denen Metallatome und NH3-Molekeln in das Gitter eingelagert sind. Es konnten bisher dargestellt werden: eine blaue Verbindung mit der angenäherten Zusammensetzung C12Me(NH3)2 und der Struktur einer 1. Stufe, sowie eine alkaliärmere, schwarze Verbindung, etwa C28Me(NH3)2 mit der Struktur einer 2. Stufe.Lithium, gelöst in Methylamin, gibt mit Graphit eine blaue 1. Stufe mit der Idealformel C12Li(CH3NH2)2.Durch die Einlagerung vergrößert sich der Abstand benachbarter C-Ebenen im Graphit von 3,35 auf 6,6 kX bei allen Ammoniakaten und auf 6,9 kX bei der Methylaminverbindung.

Additional Material: 2 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/zaac.19552820126

Permalink

	Location	Call Number	Expected	Availability

Others were also interested in ...

Paper (German National Licenses)

Fulltext

hits 1 - 3 | 3 hits