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塔里木盆地荒漠植物与表土碳同位素组成研究

ISSN号：1000-0240
期刊名称：《冰川冻土》
时间：0
分类：Q946.913[生物学—植物学]
作者机构：[1]中国科学院寒区旱区环境与工程研究所沙漠与沙漠化重点实验室,甘肃兰州730000, [2]兰州大学西部环境教育部重点实验室,甘肃兰州730000
相关基金：国家自然科学基金项目（40671195;90502008）;中国博士后科学基金项目（20060390193）;科技部重点国际合作项目（2002CB714004）资助.

关键词：碳同位素组成, 植物, 表土, 塔里木盆地, stable carbon isotope composition, plant, surface soil, Tarim Basin

中文摘要：

表土有机质碳同位素组成（δ^13Corg）反映了来自于地表各种植物δ^13Corg的一个混合信息．要从沉积物δ^13Corg中提取可靠的植被信息，需要系统研究现代表土有机质δ^13Corg与地表植被δ^13Corg的差异．初步研究了塔里木盆地主要现代植被及土壤碳同位素组成，对比不同地区土壤和地表植被δ^13Corg的差异．结果表明：塔里木盆地柽柳属种群中植物与表土碳同位素组成之间存在显著相关关系，说明在干旱地区土壤中微生物和水生生物等的干扰因素可以忽略，其现代土壤的同位素组成只与地表相应的主要植被类型有关．塔里木盆地柽柳属种群中表土有机质δ^13Corg值比地表植被δ^13Corg值平均偏正1．71‰左右，不同于其它地区表土和地表植被δ^13Corg差异（2．2‰,1‰，0．5‰）的结果，反映不同地区表土和地表植被有机质δ^13Corg值差异不同．在利用沉积物δ^13Corg值提取古生态植被信息时，应考虑到不同地区土壤有机质与地表植被δ^13Corg值的不同差异会影响植被中Cs、Ca植物组成情况．

英文摘要：

The stable carbon isotope compositions in surface soil organic matter （δ^13Corg） are medley information mainly from the standing terrestrial plants. In order to obtain the valuable vegetation information from δ^13Corg in terrestrial sediment, it is necessary to investigate the relationship between δ^13Corg value in modern surface soil organic matter and standing vegetation. In this paper a primary survey on the δ^13Corg composition in modern surface soil organic matter and standing vegetation in the Tarim Basin is presented, and compared the δ^13Corg discrepancy between modern surface soil organic matter and standing vegetation among different regions. The results showed that the δ^13Corg values of plant in Tamarix L. populations are positively correlated with that of surface soil in the Tarim Basin, indicating that the interfering factors of microorganism and hydrophyte could be ignored in the arid regions. The δ^13Corg, values of modern surface soil organic are greater than that of standing vegetation, and the discrepancy of mean δ^13Corg, values between them is about 1.71‰ in the Tarim Basin. The discrepancies of δ^13Corg, values between surface soil organic matter and standing vegetation are different from region to region （2.2‰, 1‰, 0.5‰）. It should be considered that the discrepancies of δ^13Corg, values between surface soil organic matter and standing vegetation among different regions could influence the C3/C4 vegetation compositions, when the paleovegetation information from δ^13Corg, in terrestrial sediment is obtained.

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