Altitudinal gradient

Mariotti, A., Pierre, D., Vedy, J.C., Burckert, S. and Guillemot, J. 1980 The abundance of natural nitrogen 15 in the organic matter of soils along an altitudinal gradient (Chablais, Haute-Savoie, France). Catena 7 293-300. 

Kouwenberg LLR, Kiirschner WM, McElwain JC (2007) Stomatal frequency change over altitudinal gradients prospects for paleoaltimetry. Rev Mineral Geochem 66 215-242 Kroopnick P, Craig H (1972) Atmospheric oxygen isotopic composition and solubility fractionation. Science... 

Stomatal Frequency Change Over Altitudinal Gradients Prospects for Paleoaltimetry... 

Stomatal Frequenq/ Change Over Altitudinal Gradients... 

Stable isotope proxies. These 4 chapters cover theory of stable isotopes in precipitation and their response to altitudinal gradients (Rowley), and stable isotopes sytematics in paleosols (Quade, Garzione and Eiler), silicates (Mulch and Chamberlain) and fossils (Kohn and Dettman). 

Cabrera, H. M., Rada, F., Cavieres, L. 1998. Effects of temperature on photosynthesis of two morphologically contrasting plant species along an altitudinal gradient in the tropical high Andes. Oecologia 114 145-152. 

Clarke, N., Rosberg, 1., Aamlid D. 2005. Concentrations of dissolved organic carbon along an altitudinal gradient from Norway spruce forest to the mountain birch/alpine ecotone in Norway. Boreal environ. Res. 10 181-189. 

Hoover, C. M., Crossley, Jr. D. A. 1995. Leaf litter decomposition and microarthropod abundance along an altitudinal gradient. In Collins, H. P., Robertson, G. P., Klug, M. J. (eds.). The Significance and Regulation of Soil Biodiversity. Kluwer Academic Publishers. Dordrecht, pp. 287-292. 

Rada, F., Goldstein, G., Azocar, A., Torres, F. 1987. Supercooling along an altitudinal gradient in Espeletia schultzii, a caulescent giant rosette species. J. Exper. Bot. 38 491-497. 

Interestingly, the relations between soil pH and N supply found along the short transect at Betsele are very much the same as those proposed by Read (1986 1991) as typical for long latitudinal and altitudinal gradients from polar/Alpine conditions through temperate coniferous forests and nemoral deciduous forests to dry and warm temperate steppe conditions. Read proposed that under cold and wet conditions, decomposition of organic matter would be slow and incomplete and result in the formation of acid, peaty soils or thick mor-layers with slow mineralization of organic... 

The situation is still unclear, however, because the caudatum variety in northern South America accumulates ptaquiloside in inverse proportion to the elevation. Caudatum plants collected in grassland on mountain slopes along a 1000 m altitudinal gradient and similar nutrients content and water regime contained from 0.3 mg/g in the lower tier down to 5.36 -3.88 x 10"2 mg/g in specimens near the upper altitudinal limit of this variety, with good concentration/altitude linear correlations [14]. Mean temperatures were 23.3 °C in the lower terrain and 15.6 °C in the upper confines of the transect. However, when the same plants were re-tested after re-growth following wildfires in the area in 1998, values went up to 3.5 mg/g and the altitudinal correlation was diffuse. Therefore, the production and accumulation of ptaquiloside in bracken is still unclear... 

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