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Rehabilitation of bauxite residue to support soil development and grassland establishment

Journal of Central South University 2019年第2期26卷 353-360页

作者： XUE Sheng-guo Department of Biological Sciences and Bernal Institute University of LimerickCo. School of Metallurgy and Environment Central South University

Rehabilitation(amendment and vegetation establishment)on bauxite residue is viewed as a promising strategy to stabilize the surface and initiate soil ***,such approaches are inhibited by high pH,high exchangeable sodium(ESP)and poor nutrient *** with gypsum is effective in improving residue physical and chemical properties and promoting seed establishment and *** of organics(***)can address nutrient deficiencies but supplemental fertilizer additions may be required.A series of germination bioassays were performed on residue to determine candidate species and optimum rehabilitation application *** field trials assessed establishment of grassland species Holcus lanatus and Trifolium pratense as well as physical and chemical properties of amended *** up monitoring over five years assessed elemental content in grassland and species *** co-application of the amendments several grassland species can grow on the *** time other plant species can invade the restored area and fast growing nutrient demanding grasses are *** species can establish within a 5 Yr period and there is evidence of nutrient *** pH,sodicity and nutrient deficiencies are the major limiting factors to establishing grassland on *** restoration several plant species can grow on amended residue.

关键词： bauxite residue substrate amendment soil development soil formation in bauxite residue vegetation establishment

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Fractions and Bioavailability of soil Inorganic Phosphorus in the Loess Plateau of China under Different Vegetations

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Acta Geologica Sinica(English Edition) 2011年第1期85卷 263-270页

作者： WEI Xiaorong SHAO Mingan SHAO Hongbo GAO Jianlun XU Gang State Key Laboratory of soil Erosion and Dryland Farming on the Loess Plateau NorthwestA ＆ F University Yangling 712100 China The CAS/Shandong Provincial Key Laboratory of Coastal Environmental Process Yantai Institute of Costal Zone Research Chinese Academy of Sciences （CAS） Yantai 264003 China Institute of soil and Water Conservation Chinese Academy of Sciences and Ministry of Water Resources （CAS ＆ MWR） Yangling 712100 China Institute for Life Sciences Qingdao University of Science ＆ Technology Qingdao 266042 China Mizhi Meteorological Office of Shaanxi Province Mizhi 718100 China

Plants play an important role in soil phosphorus nutrition. However, the effect of plants on phosphorus nutrition in soils of the Loess Plateau of China is not well understood. This study was conducted to reveal the relationships between plants and phosphorus＇ fractions and availability in the Loess Plateau of China. Twenty-two plant communities were surveyed and soil samples under different plant canopies were collected for the determination of soil properties and inorganic phosphorus fractionation. The results showed that Leguminosae and Lilaceae reduced pH and increased organic matter, cation exchange capacity, total and Olsen phosphorus in soils under their canopies, while Labiatae and Rosaceae increased pH and decreased organic matter, cation exchange capacity, total and Olsen phosphorus in soils under their canopies. The contents of Ca2P, CasP, AI-P and Fe-P were highly related with soil Oisen phosphorus. They were all higher in soils under Leguminosae and Lilaceae and lower in softs under Labiatae and Rosaceae. The results of this study indicate that Leguminosae and Lilaceae improved phosphorus nutrition in soils, yet Labiatae and Rosaceae impeded the improvement of phosphorus nutrition in soils under their canopies, which will be of more help to instruct vegetation restoration in the region and provide information for soil development.

关键词： bioavailability fraction inorganic phosphorus vegetation soil development Loess Plateau

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