RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2019, Vol. 28 >> Issue (02): 450-458.doi: 10.11870/cjlyzyyhj201902021

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Stoichiometric Characteristics of Rhizosphere Soil in Different Restoration Models of Xiangjiaba Hydropower Station

LUO Ting1,2,XU Wen-nian1,2,3, CHENG Hu1,2, QIU Hui4, XIA Lu1,2, ZHAO Bing-qin1,2,3, XIA Dong1,2,3   

  1. (1. Key Laboratory of Disaster Prevention and Mitigation, China Three Gorges University, Yichang 443002, China; 2. Engineering Research Center of Eco-Environment in Three Gorges Reservoir, Three Gorges University, Yichang 443002, China; 3. Collaborative Innovation Center for Geo-Hazards and Eco-Environment in Three Gorges, China Three Gorges University, Yichang 443002, China;4. China Electric Construction Group East China Survey and Design Research Institute Co., Ltd,Hangzhou 310014,China）

  • Online:2019-02-20 Published:2019-02-25

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Abstract: In order to explore the changes of soil quality and fertility after artificial vegetation restoration in disturbed area of hydropower station. The rhizosphere and non-rhizosphere soil of the dominant species of Arthraxon hispidus under three typical slopes of Vegetation Concrete Base Spraying technique(CBS), Thick Layer Base Material Spraying technique(TBS) and Framed beams soil covering(FBSC) were collected in Xiangjiaba Dam. And the soil nutrient and microbial ecological stoichiometric ratio were studied. The results showed that:(1) The average nutrient content of CBS and TBS was significantly higher than that of FBSC. The soil nutrient content of CBS and FBSC soil had a certain enrichment in the rhizosphere, and the enrichment of organic carbon was the most obvious, while the soil total nutrient of TBS was deficient in the rhizosphere soil.(2) The soil microbial biomass of the rhizosphere soil was significantly higher than the non-rhizosphere soil in the CBS and FBSC, MBC/MBN and MBC/MBP were higher in non-rhizosphere soil. The microbial ecological stoichiometric ratio was Significant differences in three ecological restoration models(P<0.05). The rhizosphere MBC/MBN of the TBS plot was significantly higher than that of the CBS and FBSC plots(P<0.05), while its MBC/MBN was lowest in the non-rhizosphere soil. The ratio of soil microbial carbon to phosphorus in rhizosphere and non-rhizosphere was FBSC>TBS>CBS.(3) The correlation analysis indicated that soil microbial biomass carbon, microbial biomass nitrogen, organic carbon and total nitrogen had significant positive correlation.(P<0.01). The microbial biomass phosphorus had a significant positive correlation with soil organic carbon and total phosphorus(P<0.01). Soil MBC/MBN only had a significant negative correlation with microbial nitrogen(P<0.01). Comprehensive evaluation of the artificial soil restoration technology in the disturbed area of Xiangjiaba Hydropower Station after more than ten years, CBS and TBS had a better effect on the accumulation of total nutrient content of soil in this area, plant growth and development of FBSC was limited by phosphorus nutrition.


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