No differences in soil carbon stocks across the tree line in the Peruvian Andes

Zimmermann, Michael, Meir, Patrick, Silman, Miles R., Fedders, Anna, Gibbon, Adam, Malhi, Yadvinder, Urrego, Dunia H., Bush, Mark B., Feeley, Kenneth J., Garcia, Katrina C., Dargie, Greta C., Farfan, Wiliam R., Goetz, Bradley P., Johnson, Wesley T., Kline, Krystle M., Modi, Andrew T., Rurau, Natividad M.Q., Staudt, Brian T., and Zamora, Flor (2010) No differences in soil carbon stocks across the tree line in the Peruvian Andes. Ecosystems, 13 (1). pp. 62-74.

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Abstract

Reliable soil organic carbon (SOC) stock measurements of all major ecosystems are essential for predicting the influence of global warming on global soil carbon pools, but hardly any detailed soil survey data are available for tropical montane cloud forests (TMCF) and adjacent high elevation grasslands above (puna). TMCF are among the most threatened of ecosystems under current predicted global warming scenarios. We conducted an intensive soil sampling campaign extending 40 km along the tree line in the Peruvian Andes between 2994 and 3860 m asl to quantify SOC stocks of TMCF, puna grassland, and shrubland sites in the transition zone between the two habitats. SOC stocks from the soil surface down to the bedrock averaged (±standard error SE) 11.8 (±1.5, N = 24) kg C/m2 in TMCF, 14.7 (±1.4, N = 9) kg C/m2 in the shrublands and 11.9 (±0.8, N = 35) kg C/m2 in the grasslands and were not significantly different (P > 0.05 for all comparisons). However, soil profile analysis revealed distinct differences, with TMCF profiles showing a uniform SOC distribution with depth, shrublands a linear decrease, and puna sites an exponential decrease in SOC densities with soil depth. Organic soil layer thickness reached a maximum (~70 cm) at the upper limit of the TMCF and declined with increasing altitude toward puna sites. Within TMCF, no significant increase in SOC stocks with increasing altitude was observed, probably because of the large variations among SOC stocks at different sites, which in turn were correlated with spatial variation in soil depth.

Item ID: 17754
Item Type: Article (Refereed Research - C1)
Keywords: soil carbon stocks; tropical montane cloud forest; puna; tree line
ISSN: 1435-0629
Date Deposited: 15 Aug 2011 01:05
FoR Codes: 05 ENVIRONMENTAL SCIENCES > 0503 Soil Sciences > 050301 Carbon Sequestration Science @ 100%
SEO Codes: 96 ENVIRONMENT > 9614 Soils > 961405 Mountain and High Country Soils @ 100%
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