JOURNAL OF YANGTZE RIVER SCIENTIFIC RESEARCH INSTI ›› 2020, Vol. 37 ›› Issue (6): 55-61.DOI: 10.11988/ckyyb.20190171

• WATER-SOIL CONSERVATION AND ECO-CONSTRUCTION • Previous Articles     Next Articles

Stoichiometric Differences of Nutrients and Microbial Biomass in Rhizosphere Soil among Different Dominant Species in Vegetation-growing Concrete

CHENG Hu1,2, XU Wen-nian1,2,3, LUO Ting 1,2, XIANG Han-yu3, XIA Lu1,2, ZHAO Bing-qin1,2,3, XIA Dong1,2,3   

  1. 1. Hubei 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 Region of Ministry of Education, China Three Gorges University, Yichang 443002, China;
    3. Collaborative Innovation Center for Geo-hazards and Eco-environment in Three Gorges Region, China Three Gorges University, Yichang 443002, China
  • Received:2019-03-12 Online:2020-06-01 Published:2020-06-21

Abstract: In order to examine the influence of dominant species on the fertility of vegetation-growing concrete substrate, we collect the rhizosphere (R) and non-rhizosphere (N-R) soils of three dominant species (Pueraria lobata (PL), Arthraxon hispidus (AH) and Pennisetum alopecuroides (PA)) from the vegetation-growing concrete at Xiangjiaba and investigate the stoichiometric ratio of soil nutrient and microbial biomass. Results reveal that: (1) The rhizosphere, showing obvious enrichment, has higher content of nutrient and microbial biomass regardless of vegetation species than non-rhizosphere. The enrichment of nutrients except from available phosphorus in PL is more evident than that in AH and PA, and no significant difference is observed between AH and PA for most nutrient enrichment. The non-rhizosphere soil nutrient and microbial activity of PL are lower than those of AH and PA. (2) The ratios of carbon (C), nitrogen (N) and phosphorus (P) of rhizosphere soil of different plants are higher than those of non-rhizosphere soil, and in particular, the C/N and C/P in rhizosphere of PL are higher than those of AH and PA. There is no significant difference in MBC/MBN of rhizosphere soils among the three plants. The MBC/MBN and MBC/MBP in non-rhizosphere soil of AH and PA are significantly higher than those of PL (P<0.05); whereas the MBC/MBP and MBN/MBP in rhizosphere soil of PL are significantly higher than those of AH and PA (P<0.05). Compared with the average soil level in China and abroad, the C/N and MBC/MBN in the rhizosphere and non-rhizosphere soils of the three plants are higher, while C/P, N/P, MBC/MBP and MBN/MBP are lower. (3) Correlation analysis demonstrates that there is a very significant positive correlation among MBN, organic carbon, total nitrogen, total phosphorus and available nitrogen (P<0.01). However, MBP has a significant positive correlation only with available phosphorus (P<0.01). Comprehensive analysis indicates a positive role of plant in the nutrient storage of the vegetation-growing concrete substrate and a stronger nutrient enrichment ability in the rhizosphere of PL. In addition, an excessively high P content and inadequate amount of N imply the imbalanced proportion of nutrients in the substrate.

Key words: vegetation-growing concrete, ecological restoration, rhizosphere, soil stoichiometry, microbial stoichiometry

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