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当前位置: 首页 > 文章 > δ~(13)C值在羊草草原植物体中的差异和变化及其影响因素分析 草地学报 2019 (1) 153-162
Position: Home > Articles > Analysis of Differences and Influencing Factors of Plant δ~(13)C in Leymus chinensis Grassland in Inner-Mongolia,China Acta Agrestia Sinica 2019 (1) 153-162

δ~(13)C值在羊草草原植物体中的差异和变化及其影响因素分析

作  者：
耿元波;王子腾;李茹霞
单  位：
中国科学院大学;中国科学院地理科学与资源研究所
关键词：
羊草草原;δ~(13)C;~(13)C脉冲标记;土壤水分;气温;土壤温度
摘  要：
为了解稳定同位素~(13)C在草原植物体中的分配和变化以及水分和温度对~(13)C组成(δ~(13)C)的影响,在内蒙古羊草草原的生长盛期(7-9月),应用~(13)C脉冲标记技术,测定了~(13)C脉冲标记处理和对照处理下羊草草原植物活体和活根中的δ~(13)C,分析了土壤水分、气温和地温对植物体中δ~(13)C的影响。结果表明:对照处理中羊草草原植物活根δ~(13)C值比活体高1～2‰,标记处理中活体δ~(13)C值显著高于活根,标记处理中活体和活根的δ~(13)C均显著高于对照处理。生长盛期,标记和对照处理中植物活体和活根的δ~(13)C值均表现为先减小再增加,随后再减小的趋势。对照处理中活体和活根以及标记处理中活根的δ~(13)C与0～20cm土壤水分含量之间线性负相关,而标记处理中活体δ~(13)C与0～20cm土壤水分之间存在二次函数关系。标记、对照两处理中羊草草原活体、活根δ~(13)C与温度均呈线性正相关。
译  名：
Analysis of Differences and Influencing Factors of Plant δ~(13)C in Leymus chinensis Grassland in Inner-Mongolia,China
作  者：
GENG Yuan-bo;WANG Zi-teng;LI Ru-xia;Institute of Geographic Sciences and Natural Resources Research,CAS;University of Chinese Academy of Sciences;
单  位：
GENG Yuan-bo%WANG Zi-teng%LI Ru-xia%Institute of Geographic Sciences and Natural Resources Research,CAS%University of Chinese Academy of Sciences
关键词：
Leymus chinensis grassland;;~(13)C pulse labeling;;δ~(13)C;;Soil moisture content;;Air temperature;;Soil temperature
摘  要：
In order to understand the distribution and change of stable carbon isotope ~(13)C in grassland plants and the effects of soil moisture and temperature on the stable carbon isotope ~(13)C composition( δ~(13)C),we measured the δ~(13)C of shoots and living roots which both had two treatments,~(13)C pulse labeling treatment and control treatment,and analyzed the effect of soil moisture content,air temperature and ground temperature on the δ~(13)C of plants body during the fast-growing stage(July-September)of the Leymus chinensis grassland in Inner Mongolia.The results showed that the δ~(13)C of the living roots was 1～2‰ higher than the δ~(13)C of the shoots in control treatments,and the δ~(13)C of the shoots in~(13)C pulse labeling treatment was significantly greater than the δ~(13)C of the living roots.The variation trends of the δ~(13)C value of shoots and living roots in labeling and control treatments were both in good consistency with time,which showed that the value of~(13)C in shoots and living roots decreased at first,then increased,and then decreased during the growing season of plants.The δ~(13)C of the shoots and living roots in control group and living roots in ~(13)C pulse labeling treatment had a linear negative correlation with soil moisture content in the layer of 0～20 cm,but the δ~(13)C of shoots in ~(13)C pulse labeling treatment had Quadratic function relation with the soil moisture content in the layer of 0～20 cm,which indicated that the δ~(13)C increased with increasing soil moisture content when it had a low soil moisture content,and the δ~(13)C decreased when there was a high soil moisture content.In~(13)C pulse labeling treatment and control treatment,there were significant positive correlation between temperature and the δ~(13)C of the shoots and living roots,the δ~(13)C of the shoots and living roots increased with increasing the temperature.

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