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| Plant Biomass and Soil Properties during the Process of Dune Restoration in the Horqin Sandy Land |
| Zhou Xin1,2, Zuo Xiaoan1, Zhao Xueyong1, Liu Chuan2, Luo Yongqing1,2, Yue Xiangfei1, Lü Peng1 |
1. Naiman Desertification Research Station, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract To understand the differences of plant biomass characteristics and soil chemical and physical properties from different plant communities in the process of sand dune restoration, this paper examined the above-groundand below-ground biomass of mobile dune, semi-fixed dune, fixed dune, sandy grasslandfour habitats, and analyzed characteristics of soil properties and their relationships by separatingsoil into 4 layers. The results showed that plant aboveground biomass and below-ground biomass had significantly positive correlation, and the 0-10 cm depth soil layer had the largest biomass. With the fixation of sand dune, 10-20, 20-40, 40-60 cm depth belowground biomass increased significantly, and the aboveground biomass increased successively in 2.20, 98.10, 131.41, 190.38 g·m-2; below-aboveground biomass ratio was 10.44, 1.67, 0.81, 1.18 respectively. In the process of sand dune stabilization, soil bulk density in the surface layer dropped from 1.62 g·cm3 to 1.33 g·cm3; the percentage of silt sand and very fine sand from each soil layer went up, while medium grained sand went down successively; soil carbon and nitrogen content, pH, EC all accumulated gradually. Below-ground biomass had significantly positive correlation with soil carbon and nitrogen content, pH, EC; both soil carbon and nitrogen content positively related with pH, EC and soil moisture, but negatively correlated with soil bulk density (p<0.05). In conclusion, the augment of plant biomass was strongly linked with the refinement of surface layer soil particle, increase of nutrient substance and water content in the process of dune restoration; soil-vegetation systems are integrated comprehensive units.
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Received: 10 June 2014
Published: 20 January 2015
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2015, Vol. 35 
