δ13C值在羊草草原植物体中的差异和变化及其影响因素分析

doi:10.11733/j.issn.1007-0435.2019.01.020

草地学报 ›› 2019, Vol. 27 ›› Issue (1): 153-162.DOI: 10.11733/j.issn.1007-0435.2019.01.020

δ¹³C值在羊草草原植物体中的差异和变化及其影响因素分析

耿元波¹, 王子腾^1,2, 李茹霞^1,2

1. 中国科学院地理科学与资源研究所, 北京 100101;
2. 中国科学院大学, 北京 100049

收稿日期:2018-05-03 修回日期:2019-01-02 出版日期:2019-02-15 发布日期:2019-04-13
通讯作者: 耿元波,E-mail:gengyb@igsnrr.ac.cn
作者简介:耿元波(1969-),男,新疆霍城县人,博士,副研究员,主要从事环境生物地球化学方面的研究,E-mail:gengyb@igsnrr.ac.cn
基金资助:
国家自然科学基金项目（41071138）资助

Analysis of Differences and Influencing Factors of Plant δ¹³C in Leymus chinensis Grassland in Inner-Mongolia,China

GENG Yuan-bo¹, WANG Zi-teng^1,2, LI Ru-xia^1,2

1. Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China

Received:2018-05-03 Revised:2019-01-02 Online:2019-02-15 Published:2019-04-13

摘要/Abstract

摘要： 为了解稳定同位素¹³C在草原植物体中的分配和变化以及水分和温度对¹³C组成（δ¹³C）的影响，在内蒙古羊草草原的生长盛期（7-9月），应用¹³C脉冲标记技术，测定了¹³C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δ¹³C，分析了土壤水分、气温和地温对植物体中δ¹³C的影响。结果表明：对照处理中羊草草原植物活根δ¹³C值比活体高1~2‰，标记处理中活体δ¹³C值显著高于活根，标记处理中活体和活根的δ¹³C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δ¹³C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δ¹³C与0~20 cm土壤水分含量之间线性负相关，而标记处理中活体δ¹³C与0~20 cm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δ¹³C与温度均呈线性正相关。

关键词: 羊草草原, δ¹³C, ¹³C脉冲标记, 土壤水分, 气温, 土壤温度

Abstract: In order to understand the distribution and change of stable carbon isotope¹³C in grassland plants and the effects of soil moisture and temperature on the stable carbon isotope¹³C composition (δ¹³C),we measured the δ¹³C of shoots and living roots which both had two treatments,¹³C pulse labeling treatment and control treatment,and analyzed the effect of soil moisture content,air temperature and ground temperature on the δ¹³C of plants body during the fast-growing stage (July-September) of the Leymus chinensis grassland in Inner Mongolia. The results showed that the δ¹³C of the living roots was 1~2‰ higher than the δ¹³C of the shoots in control treatments,and the δ¹³C of the shoots in¹³C pulse labeling treatment was significantly greater than the δ¹³C of the living roots. The variation trends of the δ¹³C value of shoots and living roots in labeling and control treatments were both in good consistency with time,which showed that the value of¹³C in shoots and living roots decreased at first,then increased,and then decreased during the growing season of plants. The δ¹³C of the shoots and living roots in control group and living roots in¹³C pulse labeling treatment had a linear negative correlation with soil moisture content in the layer of 0~20 cm,but the δ¹³C of shoots in¹³C pulse labeling treatment had Quadratic function relation with the soil moisture content in the layer of 0~20 cm,which indicated that the δ¹³C increased with increasing soil moisture content when it had a low soil moisture content,and the δ¹³C decreased when there was a high soil moisture content. In¹³C pulse labeling treatment and control treatment,there were significant positive correlation between temperature and the δ¹³C of the shoots and living roots,the δ¹³C of the shoots and living roots increased with increasing the temperature.

Key words: Leymus chinensis grassland, ¹³C pulse labeling, δ¹³C, Soil moisture content, Air temperature, Soil temperature

中图分类号:

耿元波, 王子腾, 李茹霞. δ¹³C值在羊草草原植物体中的差异和变化及其影响因素分析[J]. 草地学报, 2019, 27(1): 153-162.

GENG Yuan-bo, WANG Zi-teng, LI Ru-xia. Analysis of Differences and Influencing Factors of Plant δ¹³C in Leymus chinensis Grassland in Inner-Mongolia,China[J]. Acta Agrestia Sinica, 2019, 27(1): 153-162.

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δ¹³C值在羊草草原植物体中的差异和变化及其影响因素分析

Analysis of Differences and Influencing Factors of Plant δ¹³C in Leymus chinensis Grassland in Inner-Mongolia,China

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