Leaf wax n-alkanes and δ13C values of CAM plants from arid southwest Africa

被引：31

作者：

Boom, A. ^{[1
]}

Carr, A. S. ^{[1
]}

Chase, B. M. ^{[2
,3
]}

Grimes, H. L. ^{[1
]}

Meadows, M. E. ^{[4
]}

机构：

[1] Univ Leicester, Dept Geog, Leicester LE1 7RH, Leics, England

[2] Univ Montpellier 2, Dept Environm, Inst Sci Evolut Montpellier, UMR 5554, F-34095 Montpellier 5, France

[3] Univ Bergen, Dept Archaeol Hist Culture & Relig, N-5020 Bergen, Norway

[4] Univ Cape Town, Dept Environm & Geog Sci, ZA-7701 Cape Town, South Africa

来源：

ORGANIC GEOCHEMISTRY | 2014年 / 67卷

关键词：

CRASSULACEAN ACID METABOLISM; CHEMOTAXONOMIC SIGNIFICANCE; ISOTOPIC COMPOSITION; SUCCULENT PLANTS; CARBON; LIPIDS; FLORA; RATIO;

D O I：

10.1016/j.orggeochem.2013.12.005

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

Alpha We analysed leaves from 42 plants from the South African Succulent Karoo. Whole leaf delta C-13 values clearly differentiated 3 different populations, consisting of plants operating under obligate CAM (crassulacean acid metabolism), facultative CAM and C-3 modes. In contrast, the leaf wax n-alkane delta C-13 data from these metabolic groups showed a broader overlapping distribution. CAM plants operating under full CAM mode produced a wide range of apparent C-13 fractionation. Succulent/CAM plant wax yield was considerable (up to 23 mg/g in our plants), so its contribution to soil composition and sedimentary leaf wax composition should not be dismissed. The presence of CAM plant wax n-alkanes in sedimentary n-alkanes could therefore be a problem for accessing ecosystem scale C-3-C-4 proportion. (C) 2013 Elsevier Ltd. All rights reserved.

引用

页码：99 / 102

页数：4

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