Acta Agrestia Sinica ›› 2019, Vol. 27 ›› Issue (1): 53-62.DOI: 10.11733/j.issn.1007-0435.2019.01.008

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Response of ecosystem soil respiration in semi-arid grassland to short-term grazing intensity in Agro-pastoral ecotone

DONG Xiao-xiao1, BO Yuan-chao1, ZHANG Xiao-lin1, HE Ting-ting3, WANG Chang-hui2, DONG Kuan-hu1   

  1. 1. College of Animal Science and Technology, Shanxi Agricultural University, Taigu, Shanxi Province 030801, China;
    2. State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China;
    3. Youyu Animal Husbandry Bureau, Youyu, Shanxi Province 037200, China
  • Received:2018-09-14 Revised:2018-12-22 Online:2019-02-15 Published:2019-04-13

农牧交错带半干旱草地生态系统土壤呼吸对短期不同放牧强度的响应

董斅晓1, 薄元超1, 张晓琳1, 贺婷婷3, 王常慧2, 董宽虎1   

  1. 1. 山西农业大学动物科技学院, 山西 太谷 030801;
    2. 中国科学院植物研究所植被与环境变化国家重点实验室, 北京 100093;
    3. 右玉县畜牧局, 山西 右玉 037200
  • 通讯作者: 董宽虎,E-mail:dongkuanhu@sxau.edu.cn;王常慧,E-mail:wangch@ibcas.ac.cn
  • 作者简介:董斅晓(1992-),女,山西偏关人,硕士研究生,主要从事草地生态与管理研究,E-mail:dongxiaoxiao_daisy@126.com
  • 基金资助:
    国家自然科学基金面上项目(31872406,31572452);东北师范大学植被生态科学教育部重点实验室开放资金资助

Abstract: Grazing is more sensitive to the change of community structure and productivity of semi-arid grassland ecosystem in fragile ecological areas. The carbon sequestration effect of the most suitable grazing intensity was obtained by studying the changes of soil respiration components under different grazing intensities. In this study,the semi-arid grassland ecosystem located in the ecotone of agriculture and animal husbandry in Youyu County,Shanxi Province,was taken as the research object. To explore the effects of different grazing intensities on soil respiration in semi-arid grassland ecosystem in a short period of time,grazing experiments with different intensities began in May 2017 and 2018. There were 4 grazing intensities,ungrazing (control),light grazing,moderate grazing and heavy grazing (expressed as G0,G1,G2 andG3, respectively).The soil total respiration (SRtot) and soil heterotrophic respiration (SRh) under different treatments were measured by static box method. The temperature and water content of 10 cm surface soil was monitored at the same time. The results showed that the seasonal dynamics of SRtot,SRh and Soil autotrophic respiration (SRa) in semi-arid grassland in the agricultural and pastoral ecotone showed a single peak variation trend with different grazing intensities,and all grazing intensities reduced SRtot and SRh. The soil temperature (10 cm) was positively correlated with SRtot and SRh(r2 > 0.1, P <0.05).

Key words: Grazing intensity, agro-pastoral ecotone, semi-arid grassland, soil respiration, soil heterotrophic respiration, soil autotrophic respiration

摘要: 放牧对生态脆弱区的半干旱草地生态系统的群落结构以及生产力的改变更加敏感。通过研究土壤呼吸各组分在不同放牧强度下的变化,得到最适宜的放牧强度的固碳效应。本研究以位于山西省右玉县农牧交错带的半干旱草地生态系统为研究对象,探究短期不同放牧强度对土壤呼吸的影响。2017-2018年每年5月开始进行不同强度的放牧实验,共设置了4个放牧强度:不放牧(对照)、轻度放牧、中度放牧和重度放牧(分别表示为G0,G1,G2和G3)。采用静态箱法测定不同处理的土壤总呼吸(Soil total respiration,SRtot)和土壤异养呼吸(Soil heterotrophic respiration,SRh),同时监测10 cm表层土壤温度和含水量。实验结果表明:短期不同放牧强度对农牧交错带半干旱草地SRtotSRh和土壤自养呼吸(Soil autotrophic respiration,SRa)在生长季均呈单峰型变化趋势,各放牧强度均使SRtotSRh有所降低。土壤温度(10 cm)与SRtotSRh呈显著正相关(r2>0.1,P <0.05)。

关键词: 放牧强度, 农牧交错带, 半干旱草地, 土壤呼吸, 土壤异养呼吸, 土壤自养呼吸

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