松嫩草原典型群落植硅体固碳与植硅体类型关系研究

THE RELATIONSHIP BETWEEN PHYTOLITH CARBON SEQUESTRATION AND PHYTOLITH TYPES IN TYPICAL PLANT COMMUNITIES OF THE SONGNEN GRASSLAND

探讨植硅体固碳能力与植硅体形态间关系,可以更精确估算群落植硅体固碳量,同时为植硅体固碳机制解释提供依据。本文在松嫩草原选取28个群落样方进行研究,按优势植物分为禾本科、莎草科、菊科三种群落类型,采用植硅体碳含量来指示植硅体自身的固碳潜力,植硅体碳占干物质含量指示群落长时间固碳能力(以下简称群落固碳能力),植硅体百分含量与固碳有关指标间的相关性来指示不同植硅体类型的固碳贡献量。研究发现:与非短细胞植硅体相比,短细胞植硅体的百分含量与植硅体碳含量、植硅体碳占干物质含量间的相关性更显著,因而其对植硅体固碳的贡献相对更大。究其原因,本文认为这可能主要与松嫩草原的短细胞植硅体的产量大以及短细胞植硅体的形成过程有关。

This paper studied the relationship between phytolith-occluded carbon(PhytOC)sequestration and phytolith types in the Songnen Grassland.It is conducive to calculating the PhytOC sequestration weight accurately,and provides a basis for explaining the mechanism of PhytOC sequestration.Twenty-eight communities,including 16 Poaceae communities,6 Cyperaceae communities and 6 Asteraceae communities,were chosen and analyzed from the Songnen grassland.PhytOC content is used to evaluate the PhytOC sequestration potential of specific phytolith type.The community carbon sequestration potential,on a long-term scale,are assessed by the PhytOC content of biomass.Besides,the phytoliths’contribution to carbon sequestration is evaluated by the correlations between phytolith percentages and carbon sequestration content.It is found that the short cell phytoliths make a higher contribution to carbon sequestration in comparison with the other cell phytoliths.This is due to the formation process of short cell phytoliths and their high productivity in the Songnen grassland.