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深入研究芦苇(Phragmites australis)不同生长期植硅体的形态变化规律,对提高古植被重建精度、探讨植硅体形成机理具有重要意义。该文对东北地区12个样点的芦苇叶片进行研究,选取长势相近、叶片大小一致的芦苇叶片,用湿式灰化法提取植硅体并对其进行分类和命名。研究发现,芦苇植硅体主要有5种类型,在不同生长期内和不同温湿度组合下,其植硅体类型组合基本无变化,说明同种植物的植硅体类型组合具有稳定性,据此可以有效地恢复古植被;同时芦苇鞍型植硅体百分含量的峰值出现在7月份,随后稍有减少,而芦苇扇型植硅体百分含量和浓度的峰值出现在8或9月份,谷值在7月份。由此推测芦苇鞍型植硅体的形成可能更多地受控于植物的光合作用和蒸腾作用,芦苇扇型植硅体的形成可能与机动细胞的支撑作用关系密切。实验结果还表明芦苇植硅体浓度并不是随着时间逐渐积累的,其在8月份达到峰值,9月份达到谷值,因此推测植物植硅体浓度的变化规律可能与植物在不同生长期其自身对硅的需求规律相一致。鞍型植硅体浓度的峰值也出现在8月份,谷值也在9月份,其浓度变化与芦苇植硅体总浓度的变化趋势相似。
In-depth study of Phyllostachys pubescens (Phragmites australis) morphological changes of phytoliths at different growth stages, to improve the accuracy of ancient vegetation reconstruction, phytolith formation mechanism is of great significance. In this paper, 12 samples of reed leaves in northeastern China were studied. Phragmites australis leaves with similar growth and leaf size were selected, and the phytoliths were extracted by wet ashing method and classified and named. The results showed that there are mainly five types of phytoliths in Phragmites australis. Under different growth periods and different combinations of temperature and humidity, the phytolith types and combinations did not change basically, indicating that the phytolith assemblages of the same species were stable. According to This can effectively restore the ancient vegetation; at the same time, the peak of the percentage content of reed saddle-shaped phyllosum appeared in July and then decreased slightly, while the peak of percentage and concentration of reed fan-shaped phyllosilicate appeared in August or September , The valley in July. Therefore, it is speculated that the formation of saddle-type phytoliths in reed may be controlled more by the photosynthesis and transpiration of plants. The formation of reed-fan-shaped phytoliths may be closely related to the supporting role of motorized cells. The experimental results also show that the concentration of phytohormones in reeds does not accumulate gradually over time, which reaches the peak in August and reaches the trough in September. Therefore, it is speculated that the variation of plant phyllosilicate concentration may be related to the change of plants during their different growth stages The demand for silicon is consistent. The peak value of saddle type phytolith concentration also appeared in August and the valley value was also in September. The trend of the concentration variation of the saddle type phytolith was similar to that of the total concentration of Phyllostachys reed plant.