辽代西辽河流域气候变化及其环境特征

来自^14C测年、花粉分析、历史文献记载、考古调查几方面研究证明，辽前期西辽河流域处于气候温暖期，此时流域内发育了黑土层，为农业生产发展提供了条件。而且由植物、动物乃至于流域内的河流、湖泊组成的生态环境也处于良性发展阶段，为辽王朝的崛起提供了基础。西辽河流域的地理位置决定了该地区基本的自然地理特征，气候波动不会超越该地区所处自然地带的局限性，辽代西辽河流域在典型草原的背景上，仍然分布有成片的沙地，且时常存在风沙现象。

Climatic Change and Its Environmental Characteristics of the Xiliao River Valley in the Liao Dynasty

Researches of ~(14)C dating,pollens analysis, historical documents and archaeological investigations prove that the climate of the Xiliao River valley came into the warm period in the first half of the Liao Dynasty.In this period of time, not only the blackland developed, which provided the conditions of agricultural development, but also the ecological environment composed of plants, animals,lakes and rivers in this valley was in positive stage, which provided the base for the rise of the Liao Dynasty. The site of Xiliao River valley determined the characteristics of physical geography of the region and the its climate change could not exceed the limit of its natural zone.Slices of deserts were also distributed over the background of typical steppe in Xiliao River valley.Phenomena of windblown sand were often happened.