中文摘要：

为了探讨沙堆灌丛植被＂肥岛＂效应影响下土壤养分的空间分布特征,以宁夏东部荒漠灌丛白刺为研究对象,对沙堆不同生境,不同土层的pH、全盐和碳氮磷含量及其比值进行了研究。结果表明：白刺沙堆土壤pH和全盐均随土层的加深而升高,相对于pH,全盐的升高更为显著（P〈0.05）,有机碳（SOC）、全氮（TN）和全磷（TP）随土壤深度的增加总体上呈逐渐降低的趋势,在土壤表层（0~40cm）,3种生境下土壤养分含量为冠下〉冠缘〉灌丛间地,TP相对于SOC和TN在不同生境、不同土层间变化不显著（P〉0.05）;在表层土壤（0~20cm）处,沙堆冠下土壤的碳氮比（C/N）、碳磷比（C/P）和氮磷比（N/P）呈极显著增加趋势;离植株不同距离的3种生境下,白刺沙堆土壤的C/N、C/P和N/P几乎无明显的规律性,经方差分析可知,土层对SOC和TN影响显著（P〈0.05）,对TP无影响（P〉0.05）,距离仅对SOC有显著影响,而距离与土层的交互作用对三者均有显著影响（P〈0.05）。白刺沙堆土壤pH和全盐对C/N、C/P、N/P的贡献为正,SOC、TN和TP对C/N的贡献均为负。

英文摘要：

In order to investigate the distribution characteristics of soil nutrient under the‘fertile island＇effect in Nebkhas vegetation,the article took the desert shrub Nitrariain Eastern Ningxia as the object of study and the research was concentrated on sand in different habitats and different soil pH,total salt and content of carbon,nitrogen and phosphorus and ecological stoichiometry characteristics.The results showed that pH and total salt were increased with soil depth,the increasing of the content of salt was more significant（P〈0.05）relative to pH,with the increasing of the soil depth,soil organic carbon（SOC）,total nitrogen（TN）and total phosphorus（TP）decreased generally,in the surface of soil（0-40cm）,the soil nutrient content 3types of habitats：the crown margin between shrubs under canopy〉periphery〉interspace,TP relative to SOC and TN in different habitats,different soil layers did not change significantly（P〉0.05）;in the surface soil of 0-20 cm,sand under canopy soil carbon to nitrogen（C/N）,carbon to phosphorus（C/P）and nitrogen to phosphorus（N/P）were increase significantly;from 3different habitats from plants the nitratria nebkha,C/N,C/P and N/P had no obvious regularity,the classical difference analysis showed that,the effects of soil SOC and TN were significantly（P〈0.05）,but had no effect on TP（P〉0.05）,the distance only had significant effect on SOC,while the effects of the 3were significantly affected（P〈0.05）.Nitraria sand soil pH and total salt make contribut to C/N,C/P,N/P,TN and SOC,while TP had an negative effect on C/N.