干旱区生态环境知识资源中心(Arid): 中东亚干旱半干旱区C3植物delta~(13)C 值的分布及其对气候的响应

Arid

	中东亚干旱半干旱区C3植物delta~(13)C 值的分布及其对气候的响应
其他题名	THE DISTRIBUTION OF delta~(13)C VALUE OF C3 PLANT AND ITS RESPONSE TO CLIMATE IN ARID AND SEMIARID CENTRAL EAST ASIA
	王丽霞 1; 李心清 2; 郭兰兰 3
ISSN	1001-7410
出版年	2006
卷号	26 期号:6 页码:955-961
中文摘要	植物化石和土壤中的有机质碳同位素指标常用来反映古气候的变化,然而碳同位素这个指标在特定地区反映气候的定量关系缺乏检验.研究剖面选择自中国的秦岭(34°14’24" N,106°55’30" E)到蒙古人民共和国北部,接近贝加尔湖地区(51°35’08" N,100°45’49" E)的研究剖面线,选择了3种C3植物(Artemisia scoparia,Ajania achilleides和Artemisia frigida),在剖面线上沿南北方向上每隔4’到5’采取一个样点,共选取161个C3植物茎叶样品进行了delta~(13)C值测定.同时收集了剖面线附近气象站的降水、气温等资料,用插值方法得到每个采样点的气温、降水数据.分析表明:C3植物的delta~(13)C值分布范围为-30～-22,其平均值为-26.81,该平均值较全球C3植物delta~(13)C平均值偏正.通过对比C3植物delta~(13)C与年均温、年均降水量、生长季节的干燥度等随纬度的变化规律,发现C3植物delta~(13)C、年均降水量、生长季节的干燥度有非常一致的变化趋势,而C3植物delta~(13)C和年均温不具有一致性.通过一元回归分析也同样发现C3植物delta~(13)C与年均降水量呈线性负相关关系(y=-0.0077x-24.838,n=161,R2=0.4418,p=0.01),与生长季节的干燥度呈线性正相关关系(y=0.7328x-28.806,n=161,R2=0.3685,p=0.01),而与年均温度没有明显的相关关系(y=-0.0461x-26.756,n=161,R2=0.0232,p=0.01).在本研究区C3植物delta~(13)C对年均降水量和生长季节的干燥度响应十分显著,而对温度的响应不明显.研究区具有明显的降水和温度的梯度分布特征,是验证植物碳同位素与气候关系的理想场所,而土壤中的有机质碳同位素与其地面上的植物碳同位素息息相关.研究也说明,在本研究区或其他气候植物组合相似的地区可以利用古土壤中的有机质碳同位素来定量或半定量地反映古气候的变化.
英文摘要	Carbon isotope of plant fossils and bulk organic matter in soil have been widely used to infer past climatic changes. Carbon isotope ratio of soil is consistent with that of plant community. To exam the relationship between isotopic signals and specific climatic factors we carried out a field observation and data collection along a sampling transect starting from 34°14’24"N and 106°55’30"E in the northern slope of the Qinling Mountain near Baoji (China) and ending at 51°35’08"N and 100°45’49"E at Hanhayn Huryee near Mongolia-Russian border. Three species of C_3 shrubs (Artemisia scoparia, Ajania achilleides and Artemisia frigida) were selected to be sampled approximately every 5 latitudinal minutes along the sampling transect. 161 samples in sum were collected in the summer of 2002, Carbon isotope of CO_2 was measured on MAT 252 Mass Spectrometer in the MOE key laboratory of the Western Environmental System (Lanzhou University) . Precipitation and air temperature data at weather stations close to the transect were obtained. Insert value method is used to get precipitation and temperature in every sampling spot. The main results show that thedelta~(13)C value of C_3 plants varies from - 3O%o to - 22%o with the average value of -26.81. The average value deflects positively than the averagedelta~(13)C value of C_3 plants throughout the world. Along the latitude, an adverse trend betweendelta~(13)C value of C_3 plants and annual precipitation and a consistent trend betweendelta~(13)C value of C_3 plants and growing-season aridity were found, although no obvious similar trends betweendelta~(13)C value of C_3 plants and annual temperature was observed. Quantitative analysis also shows that there is a strong correlation coefficient betweendelta~(13)C value of C3 plants and annual precipitation (y = -0.0077X -24. 838 , n = 161, R~2 =0. 4418 , p = 0. 01) and the correlation coefficient betweendelta~(13)C value of C_3 plants and growth-season aridity is also strong (y =0. 7328x - 28. 806 , n = 161, R~2 =0. 3685 , p = 0. 01) , while there is little relationship betweendelta~(13)C value of C_3 plants and annual temperature (y= -0. 0461x-26. 756, n = 16l,R~2 =0.0232, p=0.01). The strong relationships betweendelta~(13)C value of C_3 plants and annual precipitation and growth-season aridity obtained from this study show that the study transect is an ideal place to explore the relationships between plant isotopic signals and climatic factors. They also indicate that paleoclimates might be quantitatively retrieved using isotopic signals in paleosol in our study zone and other similar areas.
中文关键词	C_3植物 ; 碳同位素 ; 年均降水量 ; 生长季节 ; 干燥度 ; 中东亚
英文关键词	C_3 plant carbon isotope annual precipitation growing-season aridity Central East Asia
语种	中文
国家	中国
收录类别	CSCD
WOS类目	GEOLOGY
WOS研究方向	Geology
CSCD记录号	CSCD:2636493
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/2XILL650/219602
作者单位	1.辽宁省环境监测中心站, 沈阳, 辽宁 110031, 中国; 2.中国科学院地球化学研究所, 贵阳, 贵州 550002, 中国; 3.兰州大学资源环境学院, 西部环境教育部重点实验室, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	王丽霞,李心清,郭兰兰. 中东亚干旱半干旱区C3植物delta~(13)C 值的分布及其对气候的响应[J]. 兰州大学,2006,26(6):955-961.
APA	王丽霞,李心清,&郭兰兰.(2006).中东亚干旱半干旱区C3植物delta~(13)C 值的分布及其对气候的响应.,26(6),955-961.
MLA	王丽霞,et al."中东亚干旱半干旱区C3植物delta~(13)C 值的分布及其对气候的响应".26.6(2006):955-961.