Gao, Qingzhu

Li, Yu\u27e

Wan, Yunfan

Zhang, Zhongxin

English

University of Kentucky

University of Kentucky UKnowledge International Grassland Congress Proceedings 21st International Grassland Congress / 8th International Rangeland Congress Study on Methane Diurnal Emission nearby Cuona Lake in Naqu of Tibet with Different Humidity Zhongxin Zhang Capital Normal University, China Yunfan Wan Chinese Academy of Agricultural Sciences, China Yu'e Li Capital Normal University, China Qingzhu Gao Chinese Academy of Agricultural Sciences, 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/21/8-1/46 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. 瞯 ]914　 瞯 　 Multifunctional Grasslands in a Changing World 　 Volume Ⅰ 　Grasslands/Rangelands Resources and Ecology ——— Climate Change and Impact on Grasslands/RangelandsStudy on methane diurnal emission nearby Cuona Lake in Naqu of Tibet with different humidityZhang Zhong‐x in1 ,2 , W an Yun‐f an2 , L i Y u‐e1 ,2 , Gao Qing‐z hu21 College o f Resource Env ironment and Tourism ; Cap ital Normal University ; Bei j ing 100037 ; China , E‐mail : z hangz hx＠ami .ac .cn , 2 Institute o f Env ironment and Sustainable Development in A griculture ; Chinese A cademy o f A griculturalSciences ; Bei j ing 100081Key words :methane diurnal emission ,Cuona lake ,wetland ,humidity ,Naqu ,TibetIntroduction It shows that the ７０ ～ ８０ percentage of atmospheric CH４ is from biogenic sources . And it is believed that paddyfields and wetlands are the dominant sources of atmospheric CH４ ( Hu , ２００５) . We made a study on methane emission from thewetland nearby Cuona Lake in Naqu of Tibet with different humidity by field investigation , which can contribute to evaluatingmethane emission from wetlands in Tibet .Materials and methods The field experiment site was located in nearby Cuona Lake in Naqu of Tibet . On August ２００６ , ３treatments of CH４ flux were imposed with ３ replicates according to the distance from the lake . T reatments were :(１ ) Lake leveltreatment ( LT ) ;(２) Wet treatment (WT ) , １００ meter far from the lake ;(３) Dry treatment (DT ) ,５００ meter far from the lake .LH , WH and DH were the humidity of ３ treatments , respectively . Using the enclosed chamber technique , CH４ fluxes weremeasured . The chamber was a cylinder of ４０ centimeter high and its base diameter was ３０ centimeters . When measured , thebase was inserted ５‐centimeter underground , and sealed by distilled water . Samples collected by syringe were transferred intoplastic gas bags for measurement by HP６８９０GC .Results By the curve , it was proved that LH , WH and DH gradually decreased with the distance from lake . But it wasn�tsignificant for all of treatments�diurnal humidity variation . CH４ flux of all treatments with time was as follows :WT ＞ DT ＞LT . The trend of CH４ diurnal flux of all treatments was accord with each other . A peak appeared in ３ curves respectively . WTpeak and DT peak appeared at １５pm , and LT peak was at １７ pm .Figure 1 Diurnal CH ４ f lux and humidity dynamic nearby Cuona lake in Naqu o f T ibet .Conclusions CH４ emission flux of all treatments was positive , which shown that this wetland was the source of atmosphericCH４ . The CH４ flux of LT was smaller , which may result in the inhabitation of CH４ emission due to excessive humidity of thelake‐level . Because of the far distance between DT and lake and smaller humidity , it didn摧t result in much higher CH４ flux .With the moderate distance between WT and lake and with appropriate humidity , it could accelerate CH４ emission .ReferenceHu Qiwu , Wu Qin , Li Dong ,Cao Guangmin , ２００５ . Comparative study on methane emissions from alpine grasslands withdifferent soil water content . Chinese Journal o f Ecology ２４ (２) , １１８‐１２２ .50.00 .i:::: 40.00 1= 30.00 Cl E 20.00 x ::::, 0::: 10.00 I~ 0 0.00 10 11 12 13 15 16 17 ---+- LT -- WT -- DT -;i;- LH --+- WH ---DH Time(O'clock) 70 60 50 ~ "t<-40 ~ 30 ~ 20 ::E 10 18 0 

Study on Methane Diurnal Emission nearby Cuona Lake in Naqu of Tibet with Different Humidity

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Study on Methane Diurnal Emission nearby Cuona Lake in Naqu of Tibet with Different Humidity

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