贡嘎山现代植物叶蜡脂肪酸氢同位素组成及对海拔变化的响应
HYDROGEN ISOTOPIC VARIATIONS OF LEAF WAX n-FATTY ACIDS IN MODERN PLANTS AND THE RESPONDING TO ALTITUDE ON MOUNT GONGGA
查看参考文献41篇
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文摘
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文章探讨了贡嘎山东坡不同海拔高度植物和土壤饱和脂肪酸的δD_(wax)值,结果显示,土壤δD_(wax)值与海拔显著负相关(R~2=0.71),与前人报道的贡嘎山东坡土壤水、土壤正构烷烃δD值与海拔间的关系存在相同的趋势。植物δD_(wax)值与海拔间的关系与土壤水及土壤相似,但相关性不明显(R~2=0.11),然而,研究结果显示木本植物和草本植物的δD_(wax)值随海拔变化存在明显的差异,总体上草本植物的氢同位素要更负。贡嘎山木本植物、草本植物和土壤的ε_(wax-sw)值随海拔的变化波动较小,但木本植物的加权平均δD_(wax)值和ε_(wax-sw)值(土壤水和叶蜡之间的氢同位素分馏系数)比草本植物大约偏正38‰和43‰,表明它们各自对随海拔高度降水同位素变化有不同的响应。也即,沿海拔植物δD_(wax)值同时受降水δD值和植物类型两个因素控制。因此,结果揭示土壤δD_(wax)值随海拔的变化与木本植物和草本植物存在相同的趋势,木本植物的δD值比草本植物大约偏正了38‰,这个趋势显示植物类型的变化将不可避免的影响土壤饱和脂肪酸δD_(wax)值与海拔间的关系。由于植物类型随海拔增加会有较大的变化,建议利用饱和脂肪酸δD_(wax)值重建古海拔前需要对植物类型进行评估。 |
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其他语种文摘
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In this study we present leaf wax n-fatty acids hydrogen isotope data from different life form plants and surface soils(including 15 grasses,24 woody plants and 11 soil samples)along the eastern slope of Mount Gongga over a range from 1200m to 3600m above sea level.Mount Gongga,located on the eastern side of the Tibetan Plateau in Sichuan Province(29°20'~30°00'N,101°30 '~102°10'E; peak at 7556m above sea level,a.s.l),is the highest part of Daxueshan.The hydrogen isotope ratios (δD_(wax))of the C24,C26,C28,and C30 n-fatty acids range from -250 ‰ to -109 ‰ ,and are strongly inter-correlated(R2=0.87 for C26 and C24,R2=0.78 for C26 and C28,and R2=0.74 for C26 and C30; p<0.001).The results show a highly negative linear correlation of the δD_(wax)values for soils with altitude(δD_(wax)=-2.23h-128.7,R2=0.71),the same correlation as δDsw values of soil water and δD_(wax)values of soil n-alkane with altitude in previous study.The δD_(wax)values of plants show a similar trend with altitude as those for soil and soil water,but with a weak linear correlation(R2=0.11).Notably,our data identify significant differences in δD_(wax)values between woody plants and grasses,with the grasses showing more negative δD_(wax)values.The ε_(wax-sw)values(hydrogen isotope fractionation between plants and soil water)show minor fluctuation with altitude.However,the δD_(wax)and ε_(wax-sw)values of woody plants,are roughly 38 ‰ and 43 ‰ more positive than those of grasses respectively,suggesting that an "altitude effect" could also be documented in the δD_(wax)of woody plants and grasses,with each responding independently to changes in precipitation along the altitude transect.In other words,the δD_(wax)values of plants along the altitude transect are simultaneously controlled by two factors,δD value of precipitation and plant type.The δD_(wax)values for soils show a similar trend with altitude as those observed for woody plants and grasses,but the δD_(wax)values for grass are ca.38 ‰ more negative than those for woody plants.This trend suggests that a change in plant life form will inevitably change the relationship between the δD_(wax)values of soil n-fatty acids and altitude.Because plant life form is widely known to vary with altitude,our results suggest that a preliminary evaluation of plant life form is necessary when reconstructing the paleoelevation using the δD_(wax)values of soil n-fatty acids. |
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来源
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第四纪研究
,2011,31(5):856-863 【核心库】
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关键词
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植物类型
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氢同位素组成
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叶蜡饱和脂肪酸
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海拔
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贡嘎山
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地址
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中国科学院地球环境研究所, 黄土与第四纪地质国家重点实验室, 西安, 710075
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1001-7410 |
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学科
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地质学;自然地理学 |
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基金
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国家自然科学基金项目
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中国科学院知识创新工程重要方向项目
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文献收藏号
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CSCD:4330264
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