The study on pollen rain of characteristic indicator species has important significance for reconstructing paleo_ecological environment.
特征指示种花粉雨研究，对古生态环境重建也具有重要的意义。
Yellow rain is caused by pine tree pollen according to investigation of many years in Changsha.
根据对长沙黄雨的多年观测，确定黄雨是松树花粉所致。
Yellow rain is caused by pine tree pollen according to investigation of many years in Changsha.
根据对长沙黄雨的多年观测，确定黄雨是松树花粉所致。
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