Ecological stoichiometric characteristics of soil and relevant driving factors of desert oasis region
By studying the characteristics of soil nutrient content in arable land,garden land,forest land,and bare land in the desert oasis area of the northeastem edge of the Tarim Basin,the influence of different land use types on soil ecological stoichiometry was analyzed to provide a reference basis for evaluating the quality and function of soils in fragile ecosystems.The results showed that:① The soil of the study area was deficient in TN and SOC,normal in TP,and rich in TK.The pH showed a distribution pattem of"high in the northwest and low in the southeast,"which was negatively correlated with the spatial distribution pattern of other elements.② The contents of TC,SOC,TP,and TN were highest in cultivated land and lowest in bare land,but there were no appreciable differences in the content of TK across different land use modes.The TC,SOC,TN,and TP had an obvious"surface aggregation effect",and their contents reduced with the increase of soil depth;on the contrary,the pH increased with the increase of soil depth.The change in TK content was not obvious at different depths.③ Among the four landuse modes,w(C)∶w(N)was in the order of bare land＞garden land＞forest land＞cultivated land,w(C)∶w(P)was in the order of garden land＞forest land＞bare land＞cultivated land,and w(N)∶w(P)was in the order of garden land＞cultivated land＞bare land＞forest land.On different soil depths,w(C)∶w(N)increased with the increase of soil depth,w(N)∶w(P)decreased with the increase of soil depth,and w(C)∶w(P)didn't show a clear pattern of variation.④ The cumulative variance explained by ecological chemometric traits was 91.66％,of which TN had the highest importance,with a proportion of 53.5％.Therefore,the deficiency of soil nutrient elements in the arid oasis area ccould be alleviated by improving the application of nitrogen and phosphorus compound fertilizers and introducing nitrogenfixing plants.
desert oasis transition zoneland use practices:ecological stoichiometrysoil nutrientsinfluencing factors
万方数据
维普
