Chen, Junbo

Hou, Fujiang

Li, Zhigang

English

University of Kentucky

University of Kentucky UKnowledge International Grassland Congress Proceedings 21st International Grassland Congress / 8th International Rangeland Congress Response of CO2 Emissions to the Grazing and Enclosure in Temperate Grassland Ecosystem Junbo Chen Lanzhou University, China Zhigang Li Lanzhou University, China Fujiang Hou Lanzhou University, China Follow this and additional works at: https://uknowledge.uky.edu/igc  Part of the Plant Sciences Commons, and the Soil Science Commons This document is available at https://uknowledge.uky.edu/igc/21/8-1/7 The 21st International Grassland Congress / 8th International Rangeland Congress took place in Hohhot, China from June 29 through July 5, 2008. Proceedings edited by Organizing Committee of 2008 IGC/IRC Conference Published by Guangdong People's Publishing House This Event is brought to you for free and open access by the Plant and Soil Sciences at UKnowledge. It has been accepted for inclusion in International Grassland Congress Proceedings by an authorized administrator of UKnowledge. For more information, please contact UKnowledge@lsv.uky.edu. 　 Multifunctional Grasslands in a Changing World 　 Volume Ⅰ 　 瞯 ]875　 瞯Grasslands/Rangelands Resources and Ecology ——— Climate Change and Impact on Grasslands/RangelandsResponse of CO2 emissions to the grazing and enclosure in temperate grassland ecosystemJunbo CHEN , Zhigang L I , Fuj iang HOUCollege o f Pastoral A griculture Science and Technology , L anz hou University , L anz hou 730020 , China .E‐mail : cyhou f j＠ lz u .edu .cnKey words :CO２ flux , grazing , enclosure , Loess plateau , slopelandIntroduction The rangeland on the slopeland of Loess Plateau plays an important role in livestock and ecological protection . Theprocess and main influencing factors of carbon cycle in grassland ecosystem are important in the global change . Many studiesmainly focused on the flat regions . The objective of this study was to explore the influence of different management styles onsoil CO２ emission .Materials and methods The site is on a slope grassland near Huan County , Gansu Province , China ( ３７ .１°N , １０６ .８°E) . Theplots were enclosed ( in ２００１) f ree grazing grassland , and six terrains : flat , １５° shady and sunny , ３０° shady and sunny , ４５°shady and sunny slope . The measurement was conducted in August ２００６ and August ２００７ . CO２ flux was measured with LI‐COR ６４００ .Results There were different impacts of enclosure on the emissions of CO２ in different years . In ２００６ , total CO２ flux increaseddue to the increase in the emissions of shady slopes . However , there were little effects on sunny slopes and flat ( Figure １ ) .This because enclosure increased the belowground biomass , and the major part of soil respiration is root respiration . In ２００７ ,there was little impact of enclosure on the emissions of CO２ , but the CO２ emission in different slopes were different ( Figure ２ ) .Generally , CO２ flux of steep plots (４５°) increased and decreased in gentle plots (１５°) . This probably because the soil moisturecondition was poor , and the soil temperature was the main influencing factor , and the steep plots were accessible tophotosynthetic active solar radiation ( PAR) .Figure 1 The emissions o f CO2 under di f f erentmanagement sty les and terrains (2006) .Figure 2 The emissions o f CO2 under di f f erentmanagement sty les and terrains (2007) .Conclusions Current literature suggests no clear general relationships between grazing management and carbon sequestration( Reeder et al . , ２００２ ) . Overall , grazing reduced the total emissions of CO２ , because grazing removed some biomass ofaboveground and litters , also changed the belowground biomass . As the impact of grazing on the grassland is complex . Inaddition , the breathing gas and eructation of livestock are an important source of greenhouse emissions .ReferenceReeder , J . D . , Schuman , G . E . , ２００２ . Influence of livestock grazing on C sequestration in semi‐arid mixed‐grass and short‐grass rangelands . Env ironmental Pollution １１６ , ４５７‐４６３ .:,0 16-lCl 'le 0.12 0 _§_0.08-r:5 (.) 0 0.04 "' Q) X ::, u:: 0 ',0.16 lCl 'le 0.12 0 -S 0.08 r5 (.) o 0.04 "' Q) ~ u:: 0 □ Grazing Flat 0° Shady15° Shady30° Shady45° Sunny15° Sunny30° Sunny45° Plot □ Grazing ~ I Exclosion ~ - -~ -i Flat 0° Shady15° Shady30° Shady45° Sunny15° Sunny30° Sunny45° Plot 

Response of CO\u3csub\u3e2\u3c/sub\u3e Emissions to the Grazing and Enclosure in Temperate Grassland Ecosystem

https://uknowledge.uky.edu/cgi/viewcontent.cgi?article=2917&amp;context=igc

Response of CO\u3csub\u3e2\u3c/sub\u3e Emissions to the Grazing and Enclosure in Temperate Grassland Ecosystem

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