Variation in the stable carbon and nitrogen isotope composition of plants and soil along a precipitation gradient in northern China.
Variation in the stable carbon and nitrogen isotope composition of plants and soil along a precipitation gradient in northern China.
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中国北方植物和土壤稳定碳氮同位素组成随降水梯度的变化
DOI：
10.1371/journal.pone.0051894
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发表时间：
2012
期刊：
影响因子：
3.7
通讯作者：
Chen FH
中科院分区：
文献类型：
--
作者：
Ma JY;Sun W;Liu XN;Chen FH
在干旱和半干旱环境中，水分有效性是影响植物碳(δ13C)和氮(δ15N)同位素组成的最大因素。然而，植物δ13C和δ15N对降水变化的敏感性在不同地点和/或物种之间存在潜在差异，这对于利用稳定的同位素特征提取古植被和古气候信息具有重要意义。用等温线测定了地区植物和土壤有机质样品的δ13C和δ15N。C3和C4植物的δ13C和δ15N均随年平均降水量(MAP)的增加而显著降低。C3植物δ13C对MAP的敏感性(-0.6±0.0 7‰/10 0 mm)是C4植物(−0.3±0.0 8‰/10 0 mm)的两倍。3种主要优势植物的δ13C和δ15N对MAP的敏感度没有物种差异。随着MAP的增加，土壤有机质在13C中逐渐枯竭，而δ15N与MAP之间没有显著的相关性。研究结果表明，水分有效性是控制干旱半干旱区植物δ13C、δ15N和土壤δ13C变异的主要环境因子。碳同位素组成对追踪环境降水变化是有用的。植物氮同位素组成可以反映生态系统氮素循环的相对开放性。
Water availability is the most influential factor affecting plant carbon (δ 13C) and nitrogen (δ 15N) isotope composition in arid and semi-arid environments. However, there are potential differences among locations and/or species in the sensitivity of plant δ 13C and δ 15N to variation in precipitation, which are important for using stable isotope signatures to extract paleo-vegetation and paleo-climate information. We measured δ 13C and δ 15N of plant and soil organic matter (SOM) samples collected from 64 locations across a precipitation gradient with an isotherm in northern China. δ 13C and δ 15N for both C3 and C4 plants decreased significantly with increasing mean annual precipitation (MAP). The sensitivity of δ 13C to MAP in C3 plants (-0.6±0.07‰/100 mm) was twice as high as that in C4 plants (−0.3±0.08‰/100 mm). Species differences in the sensitivity of plant δ 13C and δ 15N to MAP were not observed among three main dominant plants. SOM became depleted in 13C with increasing MAP, while no significant correlations existed between δ 15N of SOM and MAP. We conclude that water availability is the primary environmental factor controlling the variability of plant δ 13C and δ 15N and soil δ 13C in the studied arid and semi-arid regions. Carbon isotope composition is useful for tracing environmental precipitation changes. Plant nitrogen isotope composition can reflect relative openness of ecosystem nitrogen cycling.
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影响因子：
4.9
作者：
Kitayama, K;Iwamoto, K
通讯作者：
Iwamoto, K
影响因子：
--
作者：
Liu WeiGuo;Wang Zheng
通讯作者：
Wang Zheng
影响因子：
4.8
作者：
BALESDENT, J;GIRARDIN, C;MARIOTTI, A
通讯作者：
MARIOTTI, A
影响因子：
2.7
作者：
Austin, AT;Vitousek, PM
通讯作者：
Vitousek, PM
DOI：
10.1071/pp98146
发表时间：
1999-01-01
期刊：
AUSTRALIAN JOURNAL OF PLANT PHYSIOLOGY
影响因子：
--
作者：
Handley, LL;Austin, AT;Stewart, GR
通讯作者：
Stewart, GR