The four typical wetlands of Phragmites australis wetland (TPa), Tamarix chinensis wetland (Tc), Suaeda salsa wetland (Ss) and Spartina alterniflora wetland (Sa) in the Yellow River Delta were selected to clarify the spatial heterogeneity of soil nutrients and their ecological stoichiometric characteristics under fiddler crab activities. The results showed that soil particle size, soil salinity and pH in Tc, TPa and Ss were greatly changed by fiddler crab activities. The averaged contents of TOC and TN in wetlands with fiddler crab activities (FC) were higher than those in wetlands without fiddler crab activities (CK). The averaged NH₄⁺-N contents of FC group in Tc, Ss and Sa were 93.42%, 52.14% and 20.05% higher than those of CK group (p<0.05), respectively. The averaged NO₃⁻-N contents of Tc and Sa in FC group were 89.79% and 167.70% higher than those of CK group (p<0.01), respectively. The variation tendency of C/N and C/P in four wetland types were greatly similar with the TOC, and N/P was similar with TN. Multi-ANOVA results showed that soil carbon and nitrogen were significantly influenced by fiddler crab activities and wetland types (p<0.05). The PCA and RDA analysis results indicated that the bioturbation from fiddler crab made the influencing factors of nutrient elements diversified. The fiddler crab activities were favorable to the soil nutrients accumulation and could reduce the nitrogen limitation of coastal ecosystem. Our results should be of importance to insight the biogeochemical process of soil nutrient elements differentiation by fiddler crab activities in coastal wetlands.

选取黄河三角洲芦苇湿地（TPa）、柽柳湿地（Tc）、碱蓬湿地（Ss）和互花米草湿地（Sa） 4个典型湿地，阐明土壤养分的空间异质性及其生态学特征。招潮蟹活动下的化学计量特征。结果表明，招潮蟹活动对土壤粒径、土壤盐分和土壤pH值Tc、TPa和Ss的影响很大。招潮蟹活动湿地（FC）的TOC和TN平均含量高于招潮蟹活动湿地（CK）。平均 NH ₄ ⁺FC组Tc、Ss、Sa中-N含量分别比CK组高93.42%、52.14%和20.05%（p <0.05）。FC组Tc和Sa的NO ₃ ^- -N平均含量分别比CK组高89.79%和167.70%（p <0.01）。四种湿地类型C/N和C/P的变化趋势与TOC有很大的相似性，N/P与TN相似。多重方差分析结果表明，招潮蟹活动和湿地类型对土壤碳氮有显着影响（p<0.05)。PCA和RDA分析结果表明招潮蟹的生物扰动使营养元素的影响因素多样化。招潮蟹活动有利于土壤养分积累，可降低沿海生态系统的氮素限制。我们的研究结果对于了解沿海湿地招潮蟹活动对土壤养分元素分化的生物地球化学过程具有重要意义。