Soil Ecological Stoichiometry Characteristics of Typical Plantation in Loess Region of Southern Ningxia
[Objective]To explore the effects of different plantation on soil ecological stoichiometric characteristics,and reveal the distribution law of soil nutrients in typical artificial plantation ecosystems in the loess region of southern Ningxia.[Method]Six typical plantation forests(Prunus sibirica forest,Prunus davidiana forest,Caragana korshinskii forest,Hippophae rhamnoides forest,Prunus sibirica×Caragana korshin-skii,Prunus sibirica×Hippophae rhamnoides)of Pengyang Zhongzhuang small watershed in the loess region of southern Ningxia were selected as the research objects,and soil samples were collected from 0-20,>20-40,>40-60,>60-80,>80-100 cm,respectively.The contents of or-ganic carbon(SOC),total nitrogen(TN),total phosphorus(TP)and total potassium(TK)in different soil layers were determined and their stoichiometric ratios were analyzed.[Result]The soil nutrient content was influenced by the forest type and soil layer,and there were signifi-cant differences in soil nutrients among different forest stands,with"surface aggregation".SOC and TN showed a decreasing trend with in-creasing soil depth,while TP and TK showed weaker changes with soil depth.The nutrient content of Caragana korshinskii forest was the high-est among the six forest stands.The soil SOC content was at a"deficient"or"slightly deficient"level,and the soil TP content was at a"slightly deficient"level,indicating that SOC and P were limiting elements.The differences in soil C∶N,N∶P and N∶K among different for-est stands were not significant,while the C∶P ratio of Prunus armeniaca×Caragana korshinskii forest was significantly higher than that of other forest stands.The correlation between soil nutrient content and ecological stoichiometry in different forest stands was inconsistent.Soil C∶P and C∶K were greatly affected by soil SOC,C∶N,N∶P and N∶K were most affected by TN,and P∶K was most affected by TP.[Conclusion]The research results provide technological support for the restoration and sustainable management of plantation vegetation in the region.
PlantationSoil nutrientsEcological stoichiometryChange characteristicsLoess region of southern Ningxia
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