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δ15N as an integrator of the nitrogen cycle
Natural abundances of the rare stable isotope of nitrogen, 15N, are now being used widely in research on N cycling in organisms and ecosystems. 15N natural abundances are used in fundamentallyExpand
The 15N natural abundance (d15N) of ecosystem samples reflects measures of water availability
Global and seasonal data are presented, a proximate mechanism for the overall relationship between water availability and ecosystem delta(15)N is postulated and, newly, a mechanism accounting for the highly delta( 15)N-depleted values found in the foliage and soils of many wet/cold ecosystems is proposed. Expand
The responses of plants to non-uniform supplies of nutrients.
  • D. Robinson
  • Medicine, Biology
  • The New phytologist
  • 1 August 1994
The growth of whole plants was least affected by a non-uniform supply of nutrients, and least variable, when comparing these attributes; this is circumstantial evidence that some of the responses did compensate partially for non- uniform supplies of nutrients. Expand
Are microorganisms more effective than plants at competing for nitrogen?
It is argued that the key determinants of 'success' in nitrogen competition are spatial differences in nitrogen availability and in root and microbial distributions, together with temporal differences in microbial and root turnover. Expand
Modelling cereal root systems for water and nitrogen capture: towards an economic optimum.
From the current estimates of parameters it is concluded that a larger investment by the crop in fine roots at depth in the soil, and less proliferation of roots in surface layers, would improve yields by accessing extra resources. Expand
Macrophysiology: large‐scale patterns in physiological traits and their ecological implications
Much of the renewed vigour in the field of physiological ecology can be attributed to the enthusiasm with which the issues raised by these seminal symposia have subsequently been pursued, and to a better appreciation of scale as a key issue. Expand
Plant root proliferation in nitrogen–rich patches confers competitive advantage
It is shown that N capture is associated strongly with proliferation during interspecific competition for finite, locally available, mixed N sources, precisely the conditions under which N becomes available to plants on generally infertile soils. Expand
Plant roots release phospholipid surfactants that modify the physical and chemical properties of soil.
These experiments provide the first evidence the authors are aware of that plant-released surfactants will significantly modify the biophysical environment of the rhizosphere. Expand
Spatial variability of soil total C and N and their stable isotopes in an upland Scottish grassland
As preparation for a below ground food web study, the spatial variability of three soil properties (total N, total C and pH) and two stable isotopes (δ13C and δ15N of whole soil) were quantifiedExpand
A theory for 15N/14N fractionation in nitrate-grown vascular plants
Abstract. We present a theory describing how the δ15N values of the nitrogen (N) pools in a vascular plant depend on that of its source N (nitrate), on 15N/14N fractionations during N assimilation,Expand