阿拉善典型荒漠生态系统呼吸与光合动态及其影响因子研究

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1、阿拉善典型荒漠生态系统呼吸与光合动态及其影响因子研究mono—peakpattern．Seasonalchangeoftotalrespirationandabovegroundrespirationcouldalsobedescribedbyamono-peakpattern．Abovegroundrespirationofcommunityaccountfor14．3-94．8％oftotalrespiration．Significantrelationshipswerefoundbetweentotalrespirationrateandsoiltemperatureatsurface，

2、whichcouldbebestdescribedbyexponentialequations，buttheexplanationquantityoftemperatureonthetotalrespiratoryrateislessthan20％．TheQlOvalueofTotalrespirationbasedonsoiltemperatureatsurfaceis1．3．Soilwatercontentisthedominatingfactorfortheseasonalvariationoftotalrespirationrate．4．Diurnaldynamicscouldbech

3、aracterizedbyamono-peakpattern，andpeaktime(9：00)isearlierthanotherecosystems．NetC02Exchangedayvariationismuchlargerthanthechangeinnight．Typicaldesertcommunitymetabolicprocessisveryweak，and，theabsorptionpeakis-2．62umol*m。z木s～．SoilwatercontentisthedominatingfactorfortheseasonalvariationofNetC02Exchang

4、e．GrowingseasonNetC02Exchangeofnegativeobservationdayaccountedfor87．5％ofthegrowingseasonallobservationdays，and，desertecosystemsisacarbonsinkingrowingseason．5．Photosynthesisratediurnaldynamicscouldbecharacterizedbyamono-peakpattern．Typicaldesertecosystermphotosynthesisabilityissignificantlylowerthano

5、therecosysterm，and，themaximumC02absorptionvalueis-4．65umol*m。2宰S～．Seasonalchangeofphotosynthesiscouldalsobedescribedbyamono-peakpattern，synchronizedwiththesoilmoistureseasonalchanges．Theaverageofcommunityphotosyntheticrateis—O．68umol木m≈木s-1，farlowerthanmostotherecosystem’Sphotosyntheticrate．KEYWORDS

6、：Carboncycle，Soilrespiration，Ecosystemrespiration，Abovegroundrespiration，NetC02Exchange，Photosynthesis，Temperature，Soilwatercontent，AlashandesertIV内蒙古大学硕士论文目录第一章前言⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯11．1研究背景⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯11．2研究意义⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．21．3主要科学问题与研究内容⋯⋯⋯⋯⋯

7、⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯21．4研究进展⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯21．4．1土壤呼吸研究现状⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯31．4．2生态系统呼吸及群落地上部分呼吸研究现状⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯41．4．4生态系统净交换研究现状⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯51．4．5群落总光合研究现状