Characteristics of soil C,N and P stoichiometry in the root zone of typical sand-fixing plants in the desert oasis transition zone of the middle reaches of the Heihe River
[Objective]The stoichiometric properties of soil C,N and P characterise changes in soil nu-trient supply and storage capacity and are key indicators of soil nutrient cycling and balance.Sand-fixing plants,mainly shrubs and semi-shrubs,play an important role in controlling desertification and maintaining the ecological security of oases.Analyzing the stoichiometric characteristics of soil C,N and P in the root zone of sand-fixing plants and exploring their nutrient variation patterns can provide scientific solutions and necessary references for maintaining the stability of the desert-oasis transition zone and for future engineer-ing practices to control wind and sand.[Method]Soil organic carbon(SOC),soil total nitrogen(STP)and soil total phosphorus(STP)were measured and analyzed in soil samples from July to September 2021 at dif-ferent soil depths in the root zone of three typical sand-fixing plants in the transition zone of the middle reaches of the Heihe River desert oasis to study the stoichiometric characteristics and influencing factors of soil C,N and P in the root zone of the three sand-fixing plants.[Result]The SOC content in the root zone of the three typical sand-fixing plants peaked in the 60～80 cm soil layer,and the peaks of STN and STP content were all in the top soil layer;the SOC content increased and then decreased with increasing soil depth,and STN and STP decreased with increasing soil depth.Under the specific environmental conditions of the study area,plant type had a significant effect on soil C,N and P contents and their stoichiometric char-acteristics,with the root zone of Haloxylon ammodendron having a higher soil nutrient content than the other two plants.The correlation coefficients between the indicators of the root zone of the three typical sand-fixing plants were generally H.ammodendron>Nitraria sphaerocarpa>Calligonum mongolicum.[Conclusion]There are significant differences in the C,N and P contents of soils in the root zones of H.am-modendron,N.sphaerocarpa and C.mongolicum in the transition zone of the middle reaches of the Heihe desert oasis(P<0.05),and the fertility retention capacity of the pokeweed and its environmental adaptabil-ity are stronger than those of the other two plants.
desert oasis transition zonesand-fixing plantsC,N and P contentsoil fertility
万方数据
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