摘要:硅能增强农作物对干旱和重金属如铝、镉、锰等的抗性已得到大量的证实，但硅在草地生态系统中的作用及作用机理至今没有明确。将国内外有关硅对土壤质地、植物个体生长以及植物群落结构影响的最新研究进行归纳，以期为硅在草地生态系统中的应用提供理论支持。通过总结发现，硅能够提高土壤有机碳、硝态氮、铵态氮和速效磷含量；在施氮肥情况下，硅肥添加通过改善植物群落的光照条件，提高杂类草的生长高度，从而缓解因氮肥添加导致的物种丰富度降低，提高植物群落的地上生产力。因此，硅在草地生态系统中具有非常重要的作用，今后应加强硅对植物生物量碳氮和土壤有机碳积累的调控作用、硅对草地生态系统中碳、氮、磷元素的生物地球化学循环规律和生产力形成机制方面的研究工作。



Abstract:It has been widely confirmed that silicon can enhance the resistance of crops to droughts and heavy metals such as aluminum, cadmium, manganese, etc. However, the role and mechanism of silicon in grassland ecosystems have not yet been clarified. In this paper, the latest research about the effects of silicon on soil texture, plant individual growth and plant community structure were summarized in order to provide theoretical support for future application of silicon in grassland ecosystem. It was found that silicon can increase the content of soil organic carbon, nitrate nitrogen, ammonia nitrogen and available phosphorus. Under the condition of nitrogen application, the light condition of plant community can be improved to increase the growth height of forbs, so as to mitigate the loss of plant species richness due to the addition of nitrogen fertilizer, and increase the above-ground productivity of plant community. Therefore, silicon plays a very important role in grassland ecosystem. The research on the application of silicon in grassland ecosystem should be focus on the regulation of silicon on phytomass carbon and nitrogen as well as the accumulation of soil organic carbon, along with the effects of silicon on the regularity of carbon, nitrogen and phosphorus biogeochemical cycles and the formation mechanism of plant productivity in the future.





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