A pot experiment was conducted in the Institute of Tianlong Ecology of Baotou City in Inner Mongolia, China, to investigate the effects of the application of biofertilizers and super absorbent polymers(SAP) on plant g...A pot experiment was conducted in the Institute of Tianlong Ecology of Baotou City in Inner Mongolia, China, to investigate the effects of the application of biofertilizers and super absorbent polymers(SAP) on plant growth and soil improvement in arid mining area soil. Two typical species, namely, Syringa oblata Lindl.(SO) and Medicago sativa L.(MS), were present in the Bayan Obo mining area and used as representatives of shrubs and herbaceous plants in the pot experiment.(1) Biofertilizers and SAP significantly increased the tree height, the ground diameter of SO, and the total biomass of MS and improved the soil fertility of the mining area, especially its biological fertility, compared with those of the control group(CK). The application of biofertilizers and SAP decreased the mining soil p H and significantly increased available nitrogen, available phosphorus, available potassium, and soil organic matter.(2) After 180 days of growth, the microbial population(bacteria, fungi, and actinomycetes) and soil microbial biomass carbon and nitrogen significantly increased. Microbial ratios C: N significantly decreased compared with those of CK.(3) T5 and T6 treatments with the following dosages might be the optimum selection for the improvement of the studied mining area soil: 20 g SAP + 15 g biofertilizers(SO), 100 g/m2 SAP + 150 g biofertilizers(MS); 20 g SAP + 30 g biofertilizers(SO), and 100 g/m2 SAP + 200 g biofertilizers(MS). This study provided a promising reference for conducting future field studies and the local vegetation restoration.展开更多
Montmorillonite, rice straw, organic manure and chemical fertilizer were usedas amendment materials for copper mine tailings, and their effects on mine tailing pH, nutrientsarid metal availability to ryegrass were inv...Montmorillonite, rice straw, organic manure and chemical fertilizer were usedas amendment materials for copper mine tailings, and their effects on mine tailing pH, nutrientsarid metal availability to ryegrass were investigated. Chemical fertilization was the most effectiveone in improving ryegrass growth in mine tailings among the amendment materials examined. It wasfound that montmorillonite raised biomass of ryegrass at the 1st and 2nd cuts, but it did not givefurther positive effects at the3rd and 4th cuts. The effect of organic materials on ryegrass growthwas not so good as expected, mainly due to their slow decomposition in mine tailings with less soilmicroorganisms. Available Cu and Zn contents in mine tailings decreased in the presence ofmontmorillonite but increased when rice straw and organic manure were used as amendments. Cu and Zncontents in ryegrass decreased with increasing the rate of montmorillonite application but increasedwith the rate of rice straw. Zn showed much stronger mobility from soil lo ryegrass than Cu, andalmost all the available N and P in mine tailings, except for the treatments with organic manure,were completely consumed after ryegrass had grown in mine tailings for more than four months andbeen harvested for four times. Owing to its large biomass and high metal uptake, ryegrass is apotential plant for remediation of metal contaminated soils in practice.展开更多
基金supported by funds for Studies on Afforestation Materials with Super Absorbent Polymers in the Zhangjiakou Drought Area of Hebei Province,China(Grant No.2014HXFWSBXY025)the business cooperation research projects for Studies on Ecological Restoration Technology of Mine Restoration in Arid Area(Eco-Elion Restoration Co.,Ltd.&Beijing Forestry University)
文摘A pot experiment was conducted in the Institute of Tianlong Ecology of Baotou City in Inner Mongolia, China, to investigate the effects of the application of biofertilizers and super absorbent polymers(SAP) on plant growth and soil improvement in arid mining area soil. Two typical species, namely, Syringa oblata Lindl.(SO) and Medicago sativa L.(MS), were present in the Bayan Obo mining area and used as representatives of shrubs and herbaceous plants in the pot experiment.(1) Biofertilizers and SAP significantly increased the tree height, the ground diameter of SO, and the total biomass of MS and improved the soil fertility of the mining area, especially its biological fertility, compared with those of the control group(CK). The application of biofertilizers and SAP decreased the mining soil p H and significantly increased available nitrogen, available phosphorus, available potassium, and soil organic matter.(2) After 180 days of growth, the microbial population(bacteria, fungi, and actinomycetes) and soil microbial biomass carbon and nitrogen significantly increased. Microbial ratios C: N significantly decreased compared with those of CK.(3) T5 and T6 treatments with the following dosages might be the optimum selection for the improvement of the studied mining area soil: 20 g SAP + 15 g biofertilizers(SO), 100 g/m2 SAP + 150 g biofertilizers(MS); 20 g SAP + 30 g biofertilizers(SO), and 100 g/m2 SAP + 200 g biofertilizers(MS). This study provided a promising reference for conducting future field studies and the local vegetation restoration.
基金Project supported by the Knowledge Innovative Program of the Chinese Academy of Sciences (No. KZCX2-401) the Director Foundation of Institute of Soil Science, the Chinese Academy of Sciences (No.ISSASIP0102).
文摘Montmorillonite, rice straw, organic manure and chemical fertilizer were usedas amendment materials for copper mine tailings, and their effects on mine tailing pH, nutrientsarid metal availability to ryegrass were investigated. Chemical fertilization was the most effectiveone in improving ryegrass growth in mine tailings among the amendment materials examined. It wasfound that montmorillonite raised biomass of ryegrass at the 1st and 2nd cuts, but it did not givefurther positive effects at the3rd and 4th cuts. The effect of organic materials on ryegrass growthwas not so good as expected, mainly due to their slow decomposition in mine tailings with less soilmicroorganisms. Available Cu and Zn contents in mine tailings decreased in the presence ofmontmorillonite but increased when rice straw and organic manure were used as amendments. Cu and Zncontents in ryegrass decreased with increasing the rate of montmorillonite application but increasedwith the rate of rice straw. Zn showed much stronger mobility from soil lo ryegrass than Cu, andalmost all the available N and P in mine tailings, except for the treatments with organic manure,were completely consumed after ryegrass had grown in mine tailings for more than four months andbeen harvested for four times. Owing to its large biomass and high metal uptake, ryegrass is apotential plant for remediation of metal contaminated soils in practice.
