Sand-fixation Caragana belt in the East Desert of the Yellow River in Ningxia Province (Salt pond)
At the beginning of the 1960s, China followed the principle of "high density for good effect of sand control", and carried out the large-scale construction of desertification projects. Over the years, the middle-aged and young sand-fixation forests were declining to death. Yang Wenbin, a researcher of Desertification Institute, China Academy of Forestry, together with his team, established a low coverage (15% ~ 25%) windbreak and sand-fixation system model after 10-year study. The study shows that low coverage belts or checkerboard pattern of near-natural vegetation, with covering degree of 15% ~ 25%, can completely fix quicksand. In Hunshandak sandy land, Inner Mongolia Autonomous Region, the low coverage of poplar belt sand fixation forests make herbaceous vegetation among belts get good recovery, soil has begun to develop, organic matter content has significantly increased, microbial growth is good, and in combination with plant roots, soil development process accelerates, forming surface soil with a strong ability to resist wind erosion. The economic benefit of more than RMB1 billion yuan can be created directly and after the implementation of the project, the cumulatively indirect benefits reach up to RMB2.644 billion yuan.
At present, this model has been used in the experimental demonstration zone established in Gansu Province, Inner Mongolia and Ningxia Hui Autonomous Region, and has also been widely applied in the Beijing-Tianjin sandstorm source control project with an important contribution.