Use of foliar Ca/Sr discrimination and 87Sr/86Sr ratios to determine soil Ca sources to sugar maple foliage in a northern hardwood forest

Abstract

Calcium/strontium and 87 Sr/ 86 Sr ratios in foliage can be used to determine the relative impor

Geomorphic regime modulates hydrologic control of chemical weathering in the Andes–Amazon

“…8a and 10a). The differences between Sr/Na and Ca/Na ratios could reflect lithologic heterogeneity and/or preferential biological Ca cycling (Blum et al, 2008).…”

Patterns of Ca/Sr and 87Sr/86Sr variation before and after a whole watershed CaSiO3 addition at the Hubbard Brook Experimental Forest, USA

“…Moreover, a recent survey shows that despite some recovery of surface waters, current inputs of acidic deposition are still resulting in the net loss of exchangeable Ca, with equivalent increases in exchangeable Al in Ca-poor watersheds across the Northeast USA (Warby et al, 2009). Many soils in this region are developed on Ca-poor silicate rocks that undergo weathering at a rate too slow to readily replenish Ca lost from the exchange pool (Likens et al, 1996;Nezat et al, 2004;Blum et al, 2008). It has been suggested that Ca may become a limiting nutrient for vegetation and at low levels may contribute to a decline in the health of some plants and animals in the region.…”

Calcium isotope constraints on the uptake and sources of Ca2+ in a base-poor forest: A new concept of combining stable (δ44/42Ca) and radiogenic (εCa) signals

“…Therefore, one of the primary research interests in forest nutrition science is the identification of bioavailable Ca sources in the soil-plant-atmosphere system. Thus far, a common way to identify the sources of Ca in forest ecosystems was with the application of indirect tracers, such as strontium isotopes ( 87 Sr/ 86 Sr) or elemental Ca/Sr and Ba/Sr ratios (Miller et al, 1993;Bailey et al, 1996;Capo et al, 1998;Kennedy et al, 1998Kennedy et al, , 2002Blum et al, 2002Blum et al, , 2008Poszwa et al, 2004;Bullen and Bailey, 2005;Drouet et al, 2005a,b;Dasch et al, 2006;Drouet and Herbauts, 2008;Nezat et al 2010). …”