Phytolith-Occluded Carbon Production of Suaede Salsa Promoted by Silicon and Organic Matter
摘要
Vegetation, such as Suaeda salsa, serves as the primary carbon sink in salt marshes and is experiencing a decline in these regions. Both silicon and organic matter in soils enhance plant adaptability to adverse conditions. Moreover, organic matter in soils facilitates silicon uptake by plants, while silicon promotes phytolith formation, thereby enhancing plant stress resistance. However, the effects of silicon and organic matter in soils on phytolith-occluded-carbon (PhytOC) production of S. salsa are unknown, and what are the optimal levels of silicon and organic matter in soils to promote PhytOC production in this plant?. To solve these problems, open-air pot experiments with of silicon fertilizer and organic fertilizer were conducted. Silicon fertilizer and organic fertilizer, as well as their interaction, affected the biomass, phytolith content, and PhytOC production of S. salsa. The highest S. salsa biomass increased by 212 ± 4% when both silicon fertilizer and organic fertilizer were applied at 7.5 g kg-1, and the highest PhytOC production increased by 628 ± 56% when silicon fertilizer and organic fertilizer were applied at 10 and 5.0 g kg-1, respectively. The appropriate levels of silicon and organic matter in soils promote both the primary production and PhytOC production of S. salsa, and the addition of exogenous silicon and organic matter represents a promising approach to enhancing the ecological value of S. salsa restoration.