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.
洪水期冲积物中的木本植物花粉主要是由雨水片流将春季落入表土的花粉带入河水中所致。
Arboreal pollen in alluvium mainly came from the surface pollen fallen on the ground in spring which was carried by sheet flow during the floods.
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