摘要：

To clarify the nutrient characteristics of 'salt island'and 'fertile island'effects in saline-alkali soil,the native Tamarix chinensis of the Yellow River Delta( YRD) was selected to measure its soil p H,electrical conductivity( EC),organic carbon( SOC),total nitrogen( N),total phosphorus( P) and their stoichiometry characteristics at different soil depths. The results showed that soil pH and EC increased with the increasing soil depth. Soil EC and P in the 0-20 cm layer decreased and increased from canopied area to interspace,respectively. SOC,N,N / P and C / P in the 20-40 cm soil layer decreased,and C / N increased from the shrub center to interspace.SOC and N contents between island and interspace both decreased but P content decreased firstly and then increased with the increasing soil depth. Soil pH correlated positively with EC. In addition,pH and EC correlated negatively with C,N,P contents and their ecological stoichiometry.

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