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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。
In order to investigate the spatial distribution characteristics of soil nutrients under the influence of sandy hedgerow vegetation and “fat island” effect, taking the desert shrubs in eastern Ningxia as the research object, the effects of pH, total salt and Carbon nitrogen and phosphorus content and its ratio were studied. The results showed that soil pH and total salt all increased with the deepening of soil depth, and the increase of total salt relative to pH was more significant (P <0.05). The contents of SOC and TN ) And total phosphorus (TP) tended to decrease with the increase of soil depth. Soil nutrient contents in the topsoil> crown margin> shrubs in the topsoil (0-40 cm) There was no significant difference between SOC and TN in different habitats and different soil layers (P> 0.05). In topsoil (0 ~ 20cm), C / N and C / C / P and N / P showed a significant increase trend. Under the three habitats with different distances from the plant, the C / N, C / P and N / P of the littoralittum had almost no significant difference The analysis of variance showed that the soil had significant effects on SOC and TN (P <0.05), but had no effect on TP (P> 0.05) Were significantly affected (P <0.05). The contribution of soil pH and total salt to C / N, C / P and N / P of Nitraria henryi sandstones was positive, and the contribution of SOC, TN and TP to C / N was negative.