运用地层中植硅体组合解释过去草原植被及气候变化的关键之一，是要了解研究区现代植硅体形态及表土植硅体组合与现代植被的关系。
The use of modern phytolith assemblages for the interpretation of fossil phytoliths shows phytolith analysis is an effective method for understanding the grassland vegetation and climate changes.
归一化差值植被指数(NDVI)是植被生长状态和空间分布的指示因子，区域气候对植被生长起着重要作用，两者具有密切的相互关系。
NDVI is an indicator of vegetation growth and its spatial distribution, with has a close relationship with climate conditions.
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