| The extremely harsh environmental conditions of dense mobile dunes seriously restrict the vegetation restoration and reconstruction in the desert area.The selection of suitable control technology for dense mobile dunes in Kubuqi Desert is conducive to the protection and restoration of the ecosystem in this area,and has important practical significance for the protection of the ecosystem in this area.In this study,three treatment technologies(P-S technology,L-S technology and S-S Technology)of Salix psammophila planted in the barrier grid of bio degradable(PLA)sandbag sand barrier,reed sand barrier and Salix psammophila were selected as the research objects.The distribution of soil water and fertilizer after 1 and 4 years of three treatment technologies were measured,and the growth status of Salix psammophila was investigated The morphological characteristics of sand dunes changed after 2 years and 4 years.The main conclusions are as follows:(1)The setting of 3 kinds of treatment technologies can effectively increase the soil water and fertilizer content,and with the increase of the installation years,the soil water and fertilizer improvement effects under the 3 kinds of treatment technologies increase.In each slope position of sand dunes,the water collection effect of P-S technology in the range of 0-10 cm of soil is better;in the range of soil 0-20 cm,the content of organic matter and available nutrients in L-S technology are higher.After the 3 treatment technologies are set for 4a,the overall trend of soil physical and chemical properties is L-S technology>S-S technology>P-S technology,which are 3.68,3.47,and 3.24 times that of bare sand dunes respectively.(2)The overall growth trend of Salix psammophila after the three treatment technologies were set was L-S technology >S-S technology > P-S technology.L-S technique is the best in different parts of the dune,and S-S technique is better than P-S technique in lower part of the dune,while P-S technique is better than S-S technique in middle and upper part of the dune.Among the three control techniques,the lower part of the dune is conducive to the growth of the branches of S.salicum,the upper part is conducive to the upward growth of the top tissue of S.salicum,and the middle part is in the middle.(3)The windward slope of the dune increases and the leeward slope becomes slower with the extension of the setting years of the three treatment techniques.The distribution of the dune slope direction was complex at first,and then gradually distributed regionally.The change of the windward slope direction was small.The northeastern part of the leeward slope was mainly eastward(67.5-112.5),and the lower part of the southeastern part of the leeward slope was mainly southeast(112.5-157.5).The top of the dune slope is reduced by about 9.19-4.37 m,and it accumulates on the leeward slope of the dune.At the same time,the wind-erosion gully generated at the boundary of the three treatment technologies was deposited about 4.5m on the windward slope within 2 years,and in2020,this part decreased about 2.5m compared with that in 2018,and the sand surface tended to be stable at the same time.The change of leeward slope is drastic,and the overall performance is accumulation.The three treatment technologies are all conducive to increasing the effect of soil water harvesting and soil improvement,improving the effectiveness of Salix afforestation,and fixing mobile sand dunes.In all parts of the sand willow,planting Salix psammophila in the reeds sand barrier has the best effect.Secondly,in the lower and upper part of the dune,the treatment technology of Salix psammophila planted in the Salix psammophila sand barrier is better,while in the middle part of the dune,the treatment technology of Salix psammophila planted in the PLA sand barrier is better. |
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