干旱区生态环境知识资源中心(Arid): 甘青藏地区现代土壤中有机质类异戊二烯烃来源及地质意义

Arid

	甘青藏地区现代土壤中有机质类异戊二烯烃来源及地质意义
其他题名	The Distribution Characteristics of Isoprenoids in the Modern Soils in the GansuQinghaiXizang(Tibet) Area
	张成君; 张菀漪; 张丽; 王小雨; 叶生霞
来源期刊	地质论评
ISSN	0371-5736
出版年	2017
卷号	63 期号:1 页码:235-245
中文摘要	本文通过对海拔高度在2500~ 4500 m的甘肃南部和祁连山、青海东部、西藏东部林中表土、林间表土、森林上限表土、森林下限表土、森林上限高山草甸土,以及青海玉树冬给错纳地区亚高山荒漠一草甸土中可溶有机质正构烷烃分析,利用检测出的类异戊二烯烃的分布特征,对Pr(姥鲛烷)、Ph (植烷)的成因特征进行研究。结果表明,在不同地理环境土壤中均有明显的Pr、Ph存在,Pr/Ph(姥植比)主要为0.6 ~ 1.4,平均0.95;Pr/ n-C17值主要为0.2 ~ 1.2,平均0.64;Ph/n-C18值主要为0.4 ~ 1.4,平均0.85。Pr和Ph不仅在水体中生成,在土壤环境中也可以形成。Pr/Ph值与不同生态环境土壤之间没有明确的相关性,但与不同地理区域有一定的联系。在较为温湿的土壤中Pr优势,可能与微生物活动强烈,采用有氧呼吸方式降解有机质有关;干旱、寒冷土壤中Ph优势,可能主要与厌氧发酵有关。由于生成Pr、Ph有机母质及演化途径的差异,以及热演化、成岩过程中的转变,其比值很大程度上影响对沉积盆地原始介质环境信息的判断。
英文摘要	Objectives: Organic isoprenoids pristine (Pr) and phytane (Ph) formed in the waterbodies under different redox condition,and the ratio of Pr/Ph so can be used to judge the redox characteristics of environments in the past researches. But whether or not they can form in the waterbodies only and how about the stability, there are disregardful. We want to determine Pr and Ph forming or not in the modern soil samples from different ecological environments to study the isoprenoids formation and characteristics, so to show the geological significance of Pr/Ph. Methods:The soluble organic n-alkanes in the modern surface soils from the mid-forests, inter-forests, upper limit forests, lower limit forests, upper limit alpine meadow, and Donggi Cona subalpine desert-meadow in the Gansu, Qinghai and Xizang(Tibet) had been analyzed in this paper. Isoprenoids had been determined based on the m/z85 from the total ion current, and the distribution characteristics and origin of Pr and Ph had been discussed. Results: It is shown that Pr and Ph save in the soils distributing in the different geographical environments not only formed in the waterbodies in the past researched. Pr/Ph ratio is in the range of 0.6 ?1.4,mean 0.95; Pr/ n-C17 ratio is 0.2 ?1.2, mean 0.64; and Ph/ n-C18 is 0.4 ?1.4,mean 0.85. There is not a clear relative between Pr/Ph and the soils in the different ecological environments,but there is a mid degree relation between Pr/ Ph with geographical belts. Conclusions: Pr predominance formed by the microorganisms degrade organic matter under aerobic respiration in the relative warm and wet soils. And Ph predominance formed under the anaerobic fermentation in the relative dry and cold soils. Because different parent materials of Pr and Ph, and different sources from terrestrial and waterbodies,and maybe influenced by the forming of Pr and Ph in the process of thermal evolution and diagenesis, Pr/Ph palaeoenvironmental proxy must be testified to judge which kinds of environmental condition in the sediment basins.
中文关键词	甘青藏地区 ; 地表土壤 ; 类异戊二烯烃 ; 微生物 ; 热演化 ; 成岩作用
英文关键词	GansuQinghaiXizang (Tibet) area surface soil isoprenoids microorganism thermal evolution diagenesis
语种	中文
国家	中国
收录类别	CSCD
WOS类目	MULTIDISCIPLINARY SCIENCES
WOS研究方向	Science & Technology - Other Topics
CSCD记录号	CSCD:5900126
来源机构	兰州大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/235822
作者单位	兰州大学地质科学与矿产资源学院, 甘肃省西部矿产资源重点实验室
推荐引用方式 GB/T 7714	张成君,张菀漪,张丽,等. 甘青藏地区现代土壤中有机质类异戊二烯烃来源及地质意义[J]. 兰州大学,2017,63(1):235-245.
APA	张成君,张菀漪,张丽,王小雨,&叶生霞.(2017).甘青藏地区现代土壤中有机质类异戊二烯烃来源及地质意义.地质论评,63(1),235-245.
MLA	张成君,et al."甘青藏地区现代土壤中有机质类异戊二烯烃来源及地质意义".地质论评 63.1(2017):235-245.