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Effects of Grazing on Ecosystem CO2 Exchange in a MeadowGrassland on the Tibetan Plateau During the Growing Season
Chen,J(Chen,Ji)[1,2]; Shi,WY(Shi,Weiyu)[1]; Cao,JJ(Cao,Junji)[1,3]
2015-02
发表期刊Environmental Management
卷号55期号:2页码:347-359
文章类型期刊论文
摘要

Effects of human activity on ecosystem carbon fluxes (e.g., net ecosystem exchange (NEE), ecosystem respiration (R eco), and gross ecosystem exchange (GEE)) are crucial for projecting future uptake of CO2 in terrestrial ecosystems. However, how ecosystem that carbon fluxes respond to grazing exclusion is still under debate. In this study, a field experiment was conducted to study the effects of grazing exclusion on R eco, NEE, and GEE with three treatments (free-range grazing (FG) and grazing exclusion for 3 and 5 years (GE3 and GE5, respectively)) in a meadow grassland on the Tibetan Plateau. Our results show that grazing exclusion significantly increased NEE by 47.37 and 15.84 %, and R eco by 33.14 and 4.29 % under GE3 and GE5 plots, respectively, although carbon sinks occurred in all plots during the growing season, with values of 192.11, 283.12, and 222.54 g C m−2 for FG, GE3, and GE5, respectively. Interestingly, grazing exclusion increased temperature sensitivity (Q 10) of R eco with larger increases at the beginning and end of growing season (i.e., May and October, respectively). Soil temperature and soil moisture were key factors on controlling the diurnal and seasonal variations of R eco, NEE, and GEE, with soil temperature having a stronger influence. Therefore, the combined effects of grazing and temperature suggest that grazing should be taken into consideration in assessing global warming effects on grassland ecosystem CO2 exchange.

关键词Grassland Management Grazing Exclusion Ecosystem Respiration Gross Ecosystem Exchange Net Ecosystem Exchange Tibetan Plateau
DOI10.1007/s00267-014-0390-z
收录类别SCI
语种英语
引用统计
被引频次:39[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ieecas.cn/handle/361006/9457
专题粉尘与环境研究室
作者单位1.State Key Laboratory of Loess and Quaternary Geology (SKLLQG), and Key Laboratory of Aerosol Chemistry and Physics, Institute of Earth EnvironmentChinese Academy of Sciences Xi’an China ;
2.Graduate University of Chinese Academy of Sciences Beijing China ;
3.Institute of Global Environmental ChangeXi’an Jiaotong University Xi’an China
推荐引用方式
GB/T 7714
Chen,J,Shi,WY,Cao,JJ. Effects of Grazing on Ecosystem CO2 Exchange in a MeadowGrassland on the Tibetan Plateau During the Growing Season[J]. Environmental Management,2015,55(2):347-359.
APA Chen,J,Shi,WY,&Cao,JJ.(2015).Effects of Grazing on Ecosystem CO2 Exchange in a MeadowGrassland on the Tibetan Plateau During the Growing Season.Environmental Management,55(2),347-359.
MLA Chen,J,et al."Effects of Grazing on Ecosystem CO2 Exchange in a MeadowGrassland on the Tibetan Plateau During the Growing Season".Environmental Management 55.2(2015):347-359.
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