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The Relationship of Human and Natural Environment in Holocene in Xiliao River Region

Suo Xiu-fen  
The human activities have close and tight relationship with changes of natural environment in Holocene in the Xiliao River Valley.The sites were mainly distributed within the loess re- gion.The altitude of these sites lowers with the rivers cut up the Month.When in Holocene, that is 12000aBP,the climate became warmer and warmer.Megathermal is between 8000aBP to 3500aBP,the area of sand land became smaller and agricultures developed.The strong tem- perature reduction happened about 5000aBP,4800-4600aBP and 3500aBP,which caused cultures decline or even disappear.The climates got warmer again in about 1000aBP,till then agriculture and husbandry developed greatly so that vegetation was destroyed and sand land en- larged.Because husbandry was the main economic style,the vegetation became better and bet- ter in Yuan and Ming Dynasties.The area of sand land enlarged again when agriculture was de- veloped greatly in Qing Dynasty.
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