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 Wysłany: Śro 23:58, 16 Lut 2011 Temat postu: Since the mid-Holocene and animal geography of the |
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Since the mid-Holocene and animal geography of the West Liaohe River Basin Environmental Changes
ad-leavedforests. ThismeansforestsplayedanimportantroleinvegetationinmiddleHoloceneinthisregion. AndinthebeginningoftheChristianEra, wildhorse (Equusprzewalskii) wasthemainlocalproduct. Thismeansthatthesteppemighthaveexpanded. ButintheMedievalera (duringthebeginningofthe10thtothebe-ginningofthe12thcenturyA.D.),[link widoczny dla zalogowanych], ThenomadicQidannationalityestablishedpowerfulLiaoDynasty. andtherewerealotofdocumentsabouttheWestLiaoheRiverBasin. Dur-ingthisperiod, theDavid'sdeer (Elaphurusdavidianus) wasrecordedbymanytravelers, buthowever, norecordofwildhorsecouldbefoundinallhistoricaldocumentsduringthisperiod. Thismeansthattheforestshadbeenexpanded. AndinthebeginningoftheQingDynasty (the17thcenturyAD), thewildhorsewasrecordedasoneofthelocalproducts. Thismeansthatthesteppecouldbeexpanded,[link widoczny dla zalogowanych], andtheforestreduced. AndbeforethemidQingDynasty (the18thcenturyAD), tiger,[link widoczny dla zalogowanych], beerandleopardwereextensivelydistributed. However, afterthemidQingDynasty, especiallyaftertheendofthe19thcentury. tigerandleopardbecamelessandlessandcouldnotbefoundinanyhistoricaldocuments. Thechangesofanimalgeographybeforethe18thcenturyweretheresultofnaturalchanges,[link widoczny dla zalogowanych], becausethepopulationwasverysparseduringthisperiodoftime. How-ever,[link widoczny dla zalogowanych], thechangesofanimalgeographyafterthe18thcenturywereinducedbyhumanactivi-ties, becausetheagriculturalpopulationmigratedmassivelyfromtheYellowRiverBasintotheWestLiaoheRiverBasinplusrapidpopulationgrowthafterthemidQingDynasty. Thisresultedinforestreductionandsteppeexpansion. Keywords: middleholocene; Historicalperiod; WestLiaoheRiverBasin; animalgeography
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