Zhaohuan Li,Chaowen Chen,Yanhong Gao,Bingyao Wang,Dongfang Wang,Yue Du,Lichao Liu,Zhengyan Wu,Dongqing Cai
The biocrust formation by cyanobacteria inoculation is considered to be a substantial and promising biotechnology method for combating desertification. However, due to the harsh ecological environment in desert, it is difficult to form stable biocrust quickly on sand surface. Herein, we fabricated a network-structured nanocomposite as nano-sand-stabilizer (named as AC) using attapulgite (ATP) and carboxymethyl cellulose (CMC). The AC with abundant ‒COOH and ‒OH had a high retention water capacity and could bind sand particles together through netting effect, providing a stable and suitable microenvironment for growth of mixed cyanobacteria (MC). A one-year field experiment confirmed that synergistic effect of AC and MC could improve the soil nutrition content and microbial structure, which was beneficial for biocrust formation and sand fixation. Therefore, this study provides a new method for fast sand fixation and promoting the biocrust formation, which could achieve the goal of sustainable desert restoration.
Boyang Xu,Yahui Hou,Zhensheng Yang,Jing Fang,Xingjiang Wu,Junjie Qi,Hao Li
The management of deserts and saline-alkali sandy soils requires a large number of efficient and economical sand-fixing agent. However, the preparation of sand-fixing materials with excellent overall performance is still a great challenge. In this work, a sand-fixing agent with amphiphilic polyelectrolyte (ASL-PVA) was prepared by graft copolymerisation of sodium lignosulfonate (SL) with cationic (DMDAAC) and polyvinyl alcohol (PVA). The sand fixation of ASL-PVA was evaluated using typical saline-alkali sandy soils from the desert topsoil of Inner Mongolia, China. The anionic, cationic and benzene ring structure of ASL-PVA give it excellent water retention, adhesion and degradation resistance in saline-alkali sandy soils. The antipolyelectrolyte effect between ASL-PVA and soluble salt ions can improve its salt tolerance. Moreover, lignin as a precursor of humus makes ASL-PVA also has the properties of improving the physicochemical properties of saline-alkali sandy soils and promoting plant growth. The ASL-PVA sand-fixing agent demonstrates promising application potential in saline-alkali sandy soil improvement and desert restoration.
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