To investigate the spatial and temporal variations of sulfur (S) in plant-soil systems of Phragmites australis (PA, native invasive species) and Cyperus malaccensis (CM, common native species) marshes, in situ filed sampling was conducted in the two marshes at different seasons. Results showed that the variations of total sulfur (TS) contents in soils differed among seasons or marshes. Higher levels of TS in soils of PA marsh generally occurred in winter and summer, while those of CM marsh were observed in spring and autumn. Except for winter, the levels of TS in topsoil of CM marsh in other seasons were much higher than those of PA marsh. The variations of TS contents in soils of PA and CM marshes were dependent on the differences in physical and chemical properties (particularly electrical conductivity) of the two marshes and the differences in S absorption and utilization of the two plants. The levels of TS and the accumulation factors of S (AF_S) in PA or CM differed within seasons or tissues, which could be interpreted by the differences in growth rhythm and ecological traits between the two plants. The roots/stems (R/S) and roots/leaves (R/L) ratios in PA or CM were mostly than 1, while the stems/leaves (S/L) ratios in both plants were less than 1. Allocations of S in roots of PA were generally higher than those of CM, while the values in aboveground parts of PA were much lower than those of CM. This paper found that the two plants might adopt different strategies for S accumulation and allocation to maintain their competitiveness. The PA might compete primarily by increasing the S accumulation capacities of its roots, whereas the CM might resist the spatial expansion of PA by enhancing the S accumulation capacities of its aboveground tissues.

研究芦苇（PA，本地入侵物种）和香附植物的植物-土壤系统中硫（S）的时空变化（CM，常见的本地物种）沼泽地，在两个不同季节的沼泽中进行了现场归档采样。结果表明，土壤中总硫（TS）含量的变化随季节或沼泽而变化。一般在冬季和夏季，PA沼泽土壤中的TS含量较高，而在春季和秋季则发现CM沼泽土壤中的TS含量较高。除冬季外，其他季节CM沼泽表层土壤TS含量均高于PA沼泽。PA和CM沼泽土壤中TS含量的变化取决于两种沼泽的理化性质（特别是电导率）的差异以及两种植物对S的吸收和利用的差异。TS的水平和S的积累因子（AF _S）在PA或CM的季节或组织中有所不同，这可以通过两种植物之间的生长节律和生态特征的差异来解释。PA或CM的根/茎（R / S）和根/叶（R / L）比例大多小于1，而两种植物的茎/叶（S / L）比例均小于1。 PA的根部中的含量通常高于CM，而PA地上部分中的含量远低于CM。本文发现这两家工厂可能会采用不同的战略来积累和分配硫，以保持竞争力。PA可能主要通过增加其根的S积累能力来竞争，而CM可能通过增强其地上组织的S积累能力来抵抗PA的空间扩展。