Episodic deposition has been recognized as a major factor affecting the decomposition rate of detrital material in salt marshes. In this paper, three one-off burial treatments, no burial treatment (0 cm, NBT), current burial treatment (10 cm, CBT) and strong burial treatment (20 cm, SBT), were designed in intertidal zone of the Yellow River Estuary to determine the potential influences of episodic deposition on nutrient (C, N) and heavy metal (Pb, Cr, Cu, Zn, Ni, Mn, Cd, V and Co) variations in decomposing litters of Suaeda glauca. Results showed that although various burial treatments showed no statistical difference in decomposition rate of S. glauca, the values generally followed the sequence of CBT (0.002 403/d) > SBT (0.002 195/d) > NBT (0.002 060/d). The nutrients and heavy metals in decomposing litters of the three burial treatments exhibited different variations except for N, Cu, Cr, Ni and Co. Except for Mn, no significant differences in C, N, Pb, Cr, Cu, Zn, Ni, V and Co concentrations occurred among the three treatments (P > 0.05). With increasing burial depth, Cr and Cd levels generally increased while Cu, Ni and Mn concentrations decreased. Although episodic deposition was generally favorable for C and N release from S. glauca, its influence on release was insignificant. In the three burial treatments, Pb, Cr, Zn, Ni, Mn, V and Co stocks in S. glauca generally evidenced the export of metals from litter to environment, and, with increasing burial depth, the export amounts increased greatly. The S. glauca were particular efficient in binding Cd and releasing Pb, Cr, Zn, Ni, Mn, V and Co, and, with increasing burial depth, stocks of Cu in decomposing litters generally shifted from release to accumulation. The experiment indicated that the potential eco-toxic risk of Pb, Cr, Zn, Ni, Mn, V and Co exposure would be serious as the strong burial episodes occurred in S. glauca marsh.

中文翻译：

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偶发性沉积对黄河口盐沼湿地绿叶枯萎凋落物中养分和重金属的潜在影响

偶发性沉积已被认为是影响盐沼中碎屑物质分解速率的主要因素。本文在黄河潮间带设计了不埋处理（0 cm，NBT）、现埋处理（10 cm，CBT）和强埋处理（20 cm，SBT）三种一次性埋藏处理方式。确定偶发性沉积对 Suaeda glauca 凋落物分解中的养分（C、N）和重金属（Pb、Cr、Cu、Zn、Ni、Mn、Cd、V 和 Co）变化的潜在影响。结果表明，虽然不同掩埋处理对青光藻的分解率无统计学差异，但其数值大体遵循CBT（0.002 403/d）> SBT（0.002 195/d）> NBT（0.002 060/d）的顺序。除 N、Cu、Cr、Ni 和 Co 外，3 种埋藏处理的腐烂凋落物的养分和重金属表现出不同的变化。除 Mn 外，C、N、Pb、Cr、Cu、Zn、Ni、 V 和 Co 浓度出现在三种处理中（P > 0.05）。随着埋藏深度的增加，Cr和Cd的含量普遍增加，而Cu、Ni和Mn的含量降低。虽然间歇性沉积通常有利于 S. glauca 释放 C 和 N，但其对释放的影响并不显着。3种埋藏处理中，S. glauca中的Pb、Cr、Zn、Ni、Mn、V和Co储量普遍证明了金属从垃圾向环境的输出，并且随着埋藏深度的增加，输出量大大增加。S. glauca 在结合 Cd 和释放 Pb、Cr、Zn、Ni、Mn、V 和 Co 以及随着埋藏深度的增加，分解凋落物中的 Cu 储量通常从释放转移到积累。实验表明，由于S. glauca沼泽发生了强烈的埋藏事件，Pb、Cr、Zn、Ni、Mn、V和Co暴露的潜在生态毒性风险会很严重。