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SCI论文目录 |
植物生长季退化草毡寒冻雏形土CO_2释放特征 |
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出 版 社:应用生态学报14(3):367-371 |
发表时间:2003 |
台 站:
海北高寒草甸生态系统定位研究站
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作 者:周党卫 曹广民 张金霞 赵新全 周兴民 |
点 击 率:6771 |
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关 键 字:关键词 退化 草毡寒冻雏形土 CO2释放速率 季节变化 日变化 |
摘 要:【摘要】 对中国科学院海北高寒草甸生态系统定位站地区退化草毡寒冻雏形土CO2释放的全天候连续观测结果表明,退化草毡寒冻雏形土CO2的释放有明显的日变化和季节动态,日最大释放速率出现于12∶00~14∶00,最小释放速率出现于6∶00~8∶00;植物生长季的最大振幅为462.49mg·m-2·h-1(8月18日),最小振幅为114.97mg·m-2·h-1(5月9日),CO2释放速率白天大于夜晚.不同物候期CO2释放速率亦不同,草盛期>枯黄期>返青期.最大日均值为480.76mg·m-2·h-1(8月18日),最小日均值为140.77mg·m-2·h-1(5月9日).释放速率与气温、地表温度及土壤5cm地温均呈显著或极显著相关关系,表明温度是决定CO2释放速率季节变化的首要因素. |
关 键 字(英文):Keywords Degenerated,Matcryo sodsoil,CO2emissionrate,Seasonaldynamic,Dailyvariation. |
摘 要(英文):CO2fluxcharacteristicsfromdegeneratedmatcryo sodsoilduringplantgrowingperiod.ZHOUDangwei,CAOGuangmin,ZHANGJinxia,ZHAOXinquan,ZHOUXingmin(NorthwestPlateauInstituteofBiology,ChineseAcademyofSciences,Xining810001,China). Chin.J.Appl.Ecol.,2003,14(3):367~371.Thecarbondioxide(CO2)emissionratewasstudiedinthedegeneratedmatcryo sodsoilcoveredwithalpineKobresiahumilismeadowattheHaibeialpinemeadowecosystemresearchstation,withCID 301psCO2analyti alinstrumentduringplantgrowthperiod(May-Sep,in1998).TheresultsshowedthattheCO2emissionratehadobviousdailyvariationandseasonaldynamics.ThemaximumrateofCO2emissionappearedat12∶00~14∶00,andtheminimumrateappearedat6∶00~8∶00.Themaxdailyamplitudewas462.49mg·m-2·h-1,whiletheminimumdailyamplitudewas114.97mg·m-2·h-1.TheCO2emissionratevariedwithphonologicalperiods,andtheorderwasexuberance>withering>greenup.Themaximumdailyaveragevaluewas480.76mg·m-2·h-1(Aug.18th),andtheminimumdailyaveragevaluewas140.77mg·m-2·h-1(May.9th).Corre ationanalysisshowedthattherewasasignificantrelationshipbetweenCO2emissionrateandairtemperature,oilsurfacetemperatureandsoiltemperaturein5cm,10cm,15cm,20cm,and30cm.TemperaturewasthedominantfactorthataffectedtheCO2emissionrateindegeneratedmatcryo sodsoil. |
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