多年放牧对不同类型草原植被及土壤碳同位素的影响

doi:10.13287/j.1001-9332.201902.031

应用生态学报 ›› 2019, Vol. 30 ›› Issue (2): 553-562.doi: 10.13287/j.1001-9332.201902.031

多年放牧对不同类型草原植被及土壤碳同位素的影响

姚鸿云^1,2,李小雁^1,3,郭娜²,王莹²,朱国栋²,王晓楠²,魏俊奇¹,王成杰^2*

¹北京师范大学地理科学学部, 北京 100875;
²内蒙古农业大学草原与资源环境学院, 呼和浩特 010019;
³地表过程与资源生态国家重点实验室, 北京 100875

收稿日期:2018-05-24 修回日期:2018-12-27 出版日期:2019-02-20 发布日期:2019-02-20
通讯作者: E-mail:nmgcjwang3@163.com
作者简介:姚鸿云,女,1988年生,博士研究生.主要从事草原生态系统(内蒙古和青藏高原)碳同位素研究.E-mail:840900767@qq.com
基金资助:
本文由国家重点研发计划项目(2016YFC0500504)、国家自然科学基金项目(31460125, 31300386)和内蒙古自治区应对气候变化及低碳发展专项资金(2016-615)资助

Effects of long-term grazing on carbon isotope composition in plants and soils of different grasslands

YAO Hong-yun^1,2, LI Xiao-yan^1,3, GUO Na², WANG Ying², ZHU Guo-dong², WANG Xiao-nan², WEI Jun-qi¹, WANG Cheng-jie^2*

¹Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China;
²College of Grassland, Resources and Environment, Inner Mongolia Agricultural University, Hohhot 010019, China;
³State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875, China

Received:2018-05-24 Revised:2018-12-27 Online:2019-02-20 Published:2019-02-20
Supported by:
This work was supported by the National Key Research and Development Project (2016YFC0500504), the National Natural Science Foundation of China (31460125, 31300386) and the Inner Mongolia Autonomous Region Special Fund for Climate Change and Low Carbon Development (2016-615).

摘要/Abstract

摘要： 放牧是草原牧区常见的人类活动,多年放牧对草原植被及土壤的碳过程产生较大的影响.本研究采集不同类型草原多年放牧前后植被及土壤样品,对室内碳同位素进行分析,研究了不同草原生态系统Δ¹³C(碳同位素分馏值)差异及其影响因素.结果表明: 放牧强度对植被Δ¹³C值的影响显著,0～5 cm表层土壤Δ¹³C值在放牧前后变化显著,而对深层土壤(>5 cm)影响不显著.多年放牧后大部分植被Δ¹³C值显著升高,高海拔地区升高的幅度较大.可见,放牧行为对不同草地生态系统类型、不同土壤深度以及不同海拔生态系统碳过程产生的影响差异显著.针对不同类型的草原,放牧应采取多样化的管理方式.

关键词: 碳同位素, 草原类型, 土壤, 放牧, 植被

Abstract: Grazing is a common human activity on grassland region. Long-term grazing exerts great effects on ecosystem carbon cycling. In this study, we collected leaf and soil samples from different grassland types across the growing season, separately from un-grazed (UG) and overgrazed (OG) plots. By analyzing the carbon isotope values of samples in laboratory, this study revealed the divergent Δ¹³C value (carbon isotope discriminative value) among different grassland ecosystems, as well as its influencing factors. The results showed that Δ¹³C value of soil at 0-5 cm significantly differed between UG and OG, but no difference at deeper layers (>5 cm). The grazing intensity had significant influence on the Δ¹³C value of vegetation leaves. After long-term grazing, most vegetation showed a significant increase in Δ¹³C value, especially in high altitude areas. In conclusion, grazing have significantly divergent impacts on the carbon processes under different grassland ecosystems, soil depths and altitudes. Therefore, a variety of grazing management strategies should be adopted for various grassland ecosystems.

Key words: carbon isotopic discrimination, vegetation, soil, grassland type, grazing

姚鸿云,李小雁,郭娜,王莹,朱国栋,王晓楠,魏俊奇,王成杰. 多年放牧对不同类型草原植被及土壤碳同位素的影响[J]. 应用生态学报, 2019, 30(2): 553-562.

YAO Hong-yun, LI Xiao-yan, GUO Na, WANG Ying, ZHU Guo-dong, WANG Xiao-nan, WEI Jun-qi, WANG Cheng-jie. Effects of long-term grazing on carbon isotope composition in plants and soils of different grasslands[J]. Chinese Journal of Applied Ecology, 2019, 30(2): 553-562.

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多年放牧对不同类型草原植被及土壤碳同位素的影响

Effects of long-term grazing on carbon isotope composition in plants and soils of different grasslands

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