干旱区生态环境知识资源中心(Arid): 植物亲缘关系影响植物叶蜡正构烷烃的含量和分布特征

Arid

	植物亲缘关系影响植物叶蜡正构烷烃的含量和分布特征
其他题名	EFFECT OF PHYLOGENETIC RELATIONSHIPS ON CONCENTRATION AND DISTRIBUTION OF LEAF WAX N-ALKANES
	石敏锐; 韩家懋; 周力平; 王国安; 李嘉竹
来源期刊	第四纪研究
ISSN	1001-7410
出版年	2021
卷号	41 期号:4 页码:1001-7410
中文摘要	沉积物中的长链正构烷烃主要来自陆生高等植物叶蜡,在古环境重建中有着广泛应用。植物叶蜡正构烷烃的含量和分布特征受植物遗传因素控制。尽管前人对遗传因素的影响有报道,但还没有学者从植物系统进化发育学的角度来揭示植物的亲缘关系对植物叶蜡正构烷烃含量和分布特征的影响。为此,本研究选择了气候差异显著的北京东灵山(温带半湿润气候)和宁夏沙坡头(温带干旱气候)作为植物样品采集地点,于2004 ~ 2019年每年9月中旬进行样品采集,通过超声提取法分离植物叶片的叶蜡正构烷烃并进行测定。结果显示,两个地区相同科的植物主峰碳(C_(max))分布相似,叶蜡正构烷烃总量(Sigma alk)和碳优势指数(CPI)存在显著性差异(p<0.05),东灵山Sigma alk和CPI的平均值分别是393 mug/g和12,沙坡头是952 mug/g和15。两个地区的平均碳链长度(ACL)没有显著性差异(p>0.05),东灵山的ACL是29.4,沙坡头是29.6。本研究还发现东灵山和沙坡头地区都存在着不同科植物之间的叶蜡正构烷烃含量和分布特征具有显著差异,同一科不同属植物间差异相对较小,同一属不同种植物之间基本一致的规律,表明植物正构烷烃在植物间的分布基本上符合生态位保守理论,即亲缘关系越近的植物其叶蜡正构烷烃分布特征越相似,呈现出较强的系统发育保守性。由于两个地区都存在这样的规律,说明该规律不会受到局地气候环境的影响,具有普适性的意义。这在古环境重建中的意义是,当利用沉积物正构烷烃信号重建古环境时,除了考虑气候变化对植物叶蜡正构烷烃的直接影响,也应考虑气候变化会导致植物种类发生变化,从而改变正构烷烃含量和分布特征,最终影响沉积物中的正构烷烃信号。另外,沉积物正构烷烃信号与其他指标,如孢粉相结合,有可能提供植物群落结构变化的准确信息。
英文摘要	The long-chain n-alkanes in sediments mainly come from terrestrial higher plant leaf waxes and are widely used in paleoenvironmental reconstructions.The concentration and distribution of leaf wax n-alkanes are affected by plant genetic factors.Although there have been reports on the influence of genetic factors,the effect of phylogenetic relationships on the concentration and distribution of plant leaf waxes n-alkanes has never been studied by using phylogenetics.This study selected two locations with obvious climate differences,Dongling Mountain in Beijing,China(39°56'N,115°32'E,temperate subhumid climate)and Shapotou in the Ningxia Hui Autonomous Region,China(37°28'N,105°06'E,temperate arid climate)as plant collection sites where plant leaves were sampled in mid-September from 2004 to 2019.During these years,331 samples were collected in Dongling Mountain and 94 samples were collected in Shapotou.The wax n-alkanes were ultrasound,extraction and measured.In Dongling Mountain,the Sigma alk ranged from 0.66 mug/g to 5155 mug/g with a mean value of 393 mug/g,the CPI from 1.87 to 48.4 with a mean value of 12,and the ACL from 26.7 to 32.1 with a mean value of 29.4.In Shapotou,the Sigma alk varied 50 mug/g to 11533 mug/g with a mean of 952 mug/g,the CPI from 1.96 to 55.1 with a mean of 15,and the ACL from 27.3 to 31.4 with a mean of 29.6.Between the two sites,there were significant differences in Sigma alk and CPI values(p<0.05),but there was no difference in ACL values(p>0.05).The present study showed that the plants within the same family were similar in main peak carbon(C_(max)),carbon preference index(CPI)and average chain length(ACL),but different in total n-alkane concentration(Sigma alk)for both regions.C31 is the C_(max) in all samples pooled and in Compositae for two sites.Furthermore,the differences in concentration and distribution of leaf waxes n-alkanes were significant across different families(p<0.01),but relatively small across different genera within the same family,and basically the same across different plant species within the same genus(p >0.05).These results suggest that the distribution of leaf wax n-alkanes among plants accorded with the niche conservatism theory.In other words,the closer the phylogenetic relationship was,the more similar the distribution of leaf wax n-alkanes was,showing a strong phylogenetic conservatism.Since the pattern occurred in both regions,it should be independent of the local climate and environment,and is an universal pattern.The implication of our finding for paleoenvironmental reconstructions is that using the signals of n-alkanes in sediments to reconstruct paleoenvironments,in addition to considering the direct impact of climate change on leaf waxes n-alkanes,it should also be considered that climate change will result in changes in plant species.The changes in plant species will affect the concentration and distribution of n-alkanes,thus,leading to variations in n-alkane signals in sediments.In addition,the combination of n-alkane signals in sediments and other indicators,such as pollen,may provide accurate information on changes in plant community structure.
中文关键词	植物叶蜡正构烷烃 ; 含量和分布特征 ; 亲缘关系 ; 局地气候
英文关键词	plant leaf wax n-alkanes concentration and distribution phylogenetic relationship local climate
类型	Article
语种	中文
国家	中国
收录类别	CSCD
WOS类目	Geology
CSCD记录号	CSCD:7011078
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/364996
作者单位	石敏锐, 中国农业大学资源与环境学院环境科学与工程系, 北京 100193, 中国.; 王国安, 中国农业大学资源与环境学院环境科学与工程系, 北京 100193, 中国.; 韩家懋, 中国科学院地质与地球物理研究所, 北京 100029, 中国.; 周力平, 北京大学城市与环境学院, 北京 100871, 中国.; 李嘉竹, 中国林业科学院荒漠化研究所, 北京 100091, 中国.
推荐引用方式 GB/T 7714	石敏锐,韩家懋,周力平,等. 植物亲缘关系影响植物叶蜡正构烷烃的含量和分布特征[J],2021,41(4):1001-7410.
APA	石敏锐,韩家懋,周力平,王国安,&李嘉竹.(2021).植物亲缘关系影响植物叶蜡正构烷烃的含量和分布特征.第四纪研究,41(4),1001-7410.
MLA	石敏锐,et al."植物亲缘关系影响植物叶蜡正构烷烃的含量和分布特征".第四纪研究 41.4(2021):1001-7410.