Evolution of soil nematode community after establishment of Haloxylon ammodendron plantations in an arid desert-oasis ecotone
Study on the evolution of soil biodiversity during the growth of sand-fixing Haloxylon ammodendron in desert-oasis ecotone is an important part of understanding the plant-soil interaction in arid areas.Diffserent ag-es(0-,3-,6-,11-,19-,28-and 46-years)of H.ammodendron plantations in Linze desert-oasis ecotone of northwestern China were selected and surface soil(0-10 cm)under and outside the canopy were sampled,to study the changes in the composition and diversity of nematode community after sand-fixing H.ammodendron es-tablishment,and to explore the indicator effect of nematode community on plant-soil system restoration.In this study,a total of 15 genera were identified,Eucephalobus and Acrobeloides were the dominant genera.Bacterial nematodes were the dominant trophic group,accounting for 50.3％-94.1％of nematode numbers.The growth of H.ammodendron significantly increased the total number of soil nematodes,bacterial feeding nematodes and nematode diversity.Nematode enrichment index(EI)and structure index(SI)were less than 50.The soil food web was stable first and then degraded gradually with plantation ages.Redundancy analysis(RDA)indicated that changes in soil chemical properties(EC,C/N,and SOC)significantly affected the distribution of nematode communities,and EC had the highest explanation rate for the total variation of nematode genera(32.7％).Soil nematode as a biological indicator reveals the evolution process of the plant-soil ecosystem.
sand-fixing Haloxylon ammodendron plantationsand-fixation yearsoil nematode communitydi-versityedge of oasis
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