DOI：10.38007/978-1-80053-545-9

The desertification of land in Xizang is primarily concentrated in Shannan, Ali, Shigatse, and parts of the area surrounding Lhasa. Among these, the Shannan region, as a key agricultural area in Xizang, is also one of the most typical regions experiencing severe land desertification. Studies show that the broad valley area of the YarlungTsangpo River in the Shannan region contains extensive riverbanks, which are rich in sand resources. Combined with the low forest vegetation coverage in the region and its dry, windy climate, these factors provide favorable conditions that promote the initiation and progression of desertification. Aeolian activities not only erode valuable land resources, leading to decreased soil fertility and degradation of grasslands, but also pose direct threats and hazards to road transportation, water conservancy facilities, and the livelihoods of farmers and herders. Therefore, on the Qinghai-Xizang Plateau - a unique geographical unit - it is an urgent scientific and ecological mission to develop efficient, eco-friendly, and durable technologies and materials for windbreak and sand fixation. 

This study is grounded in the strategic need for national ecological security and the practical demand for combating desertification on the Qinghai-Xizang Plateau. It focuses on the interdisciplinary frontier of new material technologies and ecological restoration, aiming to develop an independently patented eco-friendly sand-fixation nanomaterial suitable for cold and arid environments. Using nanotechnology as the key innovation, this study exploits the unique properties of nano-silica materials, - including its large specific surface area, high surface energy, and strong reactivity - and combines it with environmentally friendly polymers like hydroxypropyl methylcellulose (HPMC) and polyacrylamide (PAM) for composite optimization. Through meticulous molecular design and process control, the objective is to develop a new type of eco-friendly nanosand-fixation agent (NSPC) featuring strong competitive adsorption capacity, rapid adsorption kinetics, excellent water retention, irreversible curing reaction, and high ecological compatibility. 

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