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。
Yan Zhao at Lanzhou University and co-workers 1 have found an alternative climate indicator for lower areas - pollen trapped in lake sediments.
兰州大学赵艳及其合作者的研究工作证明在低海拔地区，湖泊沉积物中的孢粉可以作为很好的气候指示物。
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