下载此文档

ace-soil-respiration土壤呼吸测量技术(英文)课件.ppt

文档分类：医学/心理学 | 页数：约53页举报非法文档有奖

1/ 53

下载提示

1.该资料是网友上传的，本站提供全文预览，预览什么样，下载就什么样。
2.下载该文档所得收入归上传者、原创者。
3.下载的文档，不会出现我们的网址水印。

同意并开始全文预览

(约 1-6 秒)

1/ 53 下载此文档

文档列表 文档介绍

该【ace-soil-respiration土壤呼吸测量技术(英文)课件】是由【miao19720107】上传分享，文档一共【53】页，该文档可以免费在线阅读，需要了解更多关于【ace-soil-respiration土壤呼吸测量技术(英文)课件】的内容，可以使用淘豆网的站内搜索功能，选择自己适合的文档，以下文字是截取该文章内的部分文字，如需要获得完整电子版，请下载此文档到您的设备，方便您编辑和打印。SoilRespiration
StephenBonnage
Director
SoilRespirationStephenBonnag
SoilRespirationandtheCarboncycle

Soil:4thlargestpool
2ndlargestsourcetoatmosphere
SoilRespirationandtheCarbo
SoilRespiration
?
Soilisacomplexmixtureofmineralmatter,organicmatterandlivingorganisms

SoilRespiration
Whataretheorganisms?
Roots
Algae
Bacteria
Fungi
Earthworms
Insects
SoilRespirationWhataretheo
SoilRespiration
?

109microbesin1gramofsoil
?A
SoilRespiration
?
,whetheranimalormicrobe,produceCO2gasasaby-productoftheprocessofrespiration.

SoilRespiration
AsRaichandSchlesinger(2002)pointout,
"TherateatwhichCO2movesfromthesoiltotheatmosphereiscontrolledbytherateofCO2productioninthesoil(thetruesoilrespirationrate),thestrengthoftheCO2concentrationgradientbetweenthesoilandtheatmosphere,andpropertiessuchassoilporesize,airtemperatureandwindspeedthatinfluencethemovementofCO2throughandoutofthesoil."
Thesefactorswillbeimportanttoconsiderwhenassessingvariousattemptstoquantifymeasurementmethodologies.
SoilRespirationAsRaichandS
SoilRespiration
RaichandSchlesinger(1992)estimatedthatglobalsoilrespirationconsistsof50PgC/yearfromdetritusand18PgC/,andhigherindeciduousforeststhaninconiferousforests
SoilRespirationRaichandSchl
SoilRespiration
RaichandTufekcioglu(2000)reportedinareviewpaperthatrootcontributiontototalsoilrespirationishighincold,northernclimatessuchasarctictundra(50-93%)andborealforests(62-89%).Temperateforestsarelower,with33-50%inbroad-leavedforests,35-62%inpineforests,and12-40%,,moisture,andsubstratepropertieswerefoundtobethemostinfluentialfactorsdeterminingsoilrespiration.
SoilRespirationRaichandTufe
SoilRespiration
Soilrespirationhasbeenshowntobestronglyinfluencedbytemperature(LloydandTaylor1994,FangandMoncrieff2001).,thisfactorrepresentsthedifferenceinrespirationratesovera10degCinterval;however,thereissomedebateastohowQ10iscalculatedbasedonwhattemperaturerangetouseandwhichequationbestdescribesrespiration'(2001)suggesttheequation:Q10=(R2/R1)^10/(T2-T1)forfirst-orderexponentialfunctions,whereR1andR2aremeasuredrespirationratesattemperaturesT1andT2,respectively.
SoilRespirationSoilrespirati

ace-soil-respiration土壤呼吸测量技术(英文)课件来自淘豆网www.taodocs.com转载请标明出处.