Soil n-alkane δ13C along a mountain slope as an integrator of altitude effect on plant species δ13C

Details Soil n-alkane δ13C along a mountain slope as an integrator of altitude effect on plant species δ13C Soil n-alkane δ13C along a mountain slope as an integrator of altitude effect on plant species δ13C

Jun 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3611401w&link_type=abstract

Geophysical Research Letters, Volume 36, Issue 11, CiteID L11401

Physics

2

Biogeosciences: Biogeochemical Cycles, Processes, And Modeling (0412, 0793, 1615, 4805, 4912), Biogeosciences: Isotopic Composition And Chemistry (1041, 4870), Biogeosciences: Plant Ecology (1851), Geochemistry: Organic And Biogenic Geochemistry

Scientific paper

Carbon isotopic compositions of leaf wax-derived n-alkanes (δ 13Cwax) and bulk organic matter (δ 13CSOM) in surface soils from ca. 1000 to 3800 m above sea level along Mount Gongga, China were investigated for their altitudinal variations. There is a breakpoint, suggesting a precipitation threshold, at 2050 m in both δ 13Cwax and δ 13CSOM trends. Above the threshold, δ 13Cwax and δ 13CSOM increase in a similar pattern of the average species-level response to altitude reported from various humid mountainous areas. However, a significant decreasing trend with altitude occurs below the threshold, within which climate changes upward from arid to humid, consistent with plant foliar δ 13C response to precipitation at water-limited areas. Because δ 13Cwax and δ 13CSOM naturally integrate plant species and time, this work demonstrates that the altitude-induced environmental impact on plant species-level δ 13C has been conveyed to soils, and that the species-level δ 13C could be linearly scaled up to the community level.

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