Research On BSF-CSF Functional Sand-fixing Materials

Desertification control has become an urgent problem in the world.This article explores a new environmentally friendly material with both sand-fixing and sand-improving functions,and hopes to implement green engineering restoration and prevention of desertification.In this study,the graft copolymer was used to prepare attapulgite-based graft copolymer(CSF)for fixing sand;on the basis of it,bio-based attapulgite graft copolymer(BSF-CSF)was prepared to improve the sand.It is a cultivable soil,and a small test was conducted to test the germination rate of the seeds cultivated before and after improvement.Finally,based on 16 S r DNA sequencing,the biodiversity analysis of the sandy soil before and after improvement was conducted.After modification of Starch,APT and other materials by graft copolymerization,different graft copolymer sand-fixing materials were prepared.The CSF 9 was proved to be the best sand-fixing materials,and the preparation process was optimized as well.The results showed that the best sand fixation performance was obtained when the acid concentration was 6 mol/L,the starch gelatinization temperature was95℃ and the sodium lignosulfonate content was 10%.Compared with CSF,BSF-CSF biotype attapulgite-based graft copolymer exhibited the best water retention performance.Sand improvement using BSF-CSF not only improves the content of organic matter,but also effectively adjusts the nutrients of the sand,increased the bulk density of the sand,the aggregate structure of the sand and the porosity of the sand.According to the classification of soil,it has reached the third fourth grade of cultivated soil,indicating that the improvement of sandy soil is successful.Single-factor experiments on irrigation,sand burial depth and soil properties of four groups of sand before and after improvement were discussed.The germination rate of the BSF-CSF treatment group was 95%,much higher than the germination rate of the CSF treatment group of 41% and the germination rate of the blank group of20%.The reason is that the sand treated with BSF-CSF sand fixative has the advantages of CSF water retention and high organic matter content of BSF.Therefore,the BSF-CSF treatment group has a high germination rate.The OTU number/Shannon index/ACE index and Chao1 index of the improved sandy soil bacteria were higher than those of the improved sandy soil,indicating that the improved sandy soil bacterial diversity was relatively more abundant,and the sandy soil improvement played an important role in the research soil bacterial diversity.The community Heat map and the community Bar map were used to analyze the total abundance of Blank and CSF at the phylum,class and genus levels successively.The relative bacterial abundance of BSF was the most uniform.In view of the changes in the abundance of different bacterial species,The BSF-CSF modified sand is more similar to the Plant sample.However,the sand bacteria of Plant root system planted on BSF-CSF treated soil further illustrated that vegetation on the improved sand also played an important role in promoting soil development.