Study on soil stoichiometry characteristics and nutrient restoration status in the Jilantai desert-oasis ecotone
[Objective]The aims of this study are to investigate the characteristics of soil nutrients and their ecological stoichiometry on different underlying surfaces,to clarify the coupling relationship between vegetation succession and soil properties,and to provide a theoretical basis for vegetation restoration in the region.[Methods]Based on a combination of field sampling and indoor experiments,four types of underlying surfaces(shifting sandy land,semi-fixed sandy land,fixed sandy land and sheltered forest land)were selected in Jilantai desert-oasis ecotone.Soil bulk density(BD),soil moisture(SM),soil organic carbon(SOC),total nitrogen(TN),total phosphorus content(TP)and stoichiometry at a depth of 30 cm were measured to reveal the distribution characteristics of soil nutrient contents and stoichiometric ratios in different underlying surfaces,as well as the correlation with other environmental factors.[Results](1)The soil indexes of different underlying surfaces in Jilantai desert-oasis ecotone were in accordance with normal distribution(p＞0.05).In terms of coefficients of variation,BD and soil total porosity(STP)were weakly variable,whereas the remaining indicators were strongly variable.(2)Except for TP and BD,other indicators decreased in the order:sheltered forest land＞fixed sandy land＞mobile sand dunes＞semi fixed sandy land,indicating that the process of oasis transformation was beneficial for soil nutrient accumulation.(3)The ratios of C:N,C:P,and N:P of soils different underlying surfaces varied with the depth of soil layer.The ratios of C:N,C∶P,and N:P in different underlying surfaces ranged from 2.94 to 70.00,6.89 to 240.95,and 0.64 to 23.22,respectively.(4)The soil nutrient recovery index in different underlying surfaces decreased in the order:sheltered forest＞fixed sandy land＞semi fixed sandy land.[Conclusion]Artificial vegetation is more conducive to soil nutrient accumulation.These research results can provide basic information for vegetation restoration and conservation of desert-oasis ecotone.
万方数据
维普
