Filters: Tags: nitrogen translocation (X)
2 results (7ms)
Filters
Date Range
Extensions Types Contacts
Categories |
* 1 Arid ecosystems are a patch mosaic of plants and biological soil crusts that have been described as islands and mantles of fertility, respectively. To determine whether these patches are metabolically linked by a fungal network of dark septate and arbuscular mycorrhizal fungi (AMF), we measured translocation of nitrogen (N) and carbon (C) in a desert grassland using 15N-NO3 and 13C5, 15N-glutamic acid as substrates. * 2 Substrates were applied as point sources to either small patches of biotic crust or to a subset of leaves within a bunch grass tussock. * 3 Both substrates were translocated over approximately 1 m2 areas (approximately 20 patches) at rates up to 100 cm day?1 during a 4-day period following a...
Categories: Publication;
Types: Citation,
Journal Citation;
Tags: Bouteloua,
Journal of Ecology,
arbuscular mycorrhizal fungi,
biological soil crust,
desert grassland,
Nitrogen translocation was measured in Cladonia portentosa during 2 yr growth in Scottish heathland. Translocation was predicted to occur if N is resorbed from senescent basal tissue and recycled within the thallus. (15)N was introduced into either the lower (TU thalli) or upper (TD thalli) 25 mm of 50-mm-long thalli as (15)N-NH(4) (+), (15)N-NO(3) (-) or (15)N-glycine. Labelled thalli were placed within intact lichen cushions, either upright (TU) or inverted (TD). Vertical distribution of label was quantified immediately following labelling and after 1 and 2 yr. Independently of the form of introduced label, (15)N migrated upwards in TU thalli, with new growth being a strong sink. Sink regions for (15)N during...
Categories: Publication;
Types: Citation,
Journal Citation;
Tags: Cladonia portentosa,
New Phytologist,
ammonium,
glycine,
growth,
|
|