为探索不同优势物种对植被混凝土基材肥力的影响,采集向家坝植被混凝土3种优势物种(葛藤(PL)、荩草(AH)、双花草(PA))根际(R)和非根际(N-R)土壤,对土壤的养分和微生物生态化学计量比进行研究。结果表明:①各植物根际土壤养分和微生物量高于非根际,根际表现出明显的富集作用。葛藤对除速效磷外的其他养分的富集作用均较荩草和双花草明显,大部分养分富集作用在荩草和双花草之间差异不显著。葛藤非根际土壤养分和微生物活性低于荩草和双花草。②各植物的碳、氮、磷比都表现为根际土壤大于非根际土壤,葛藤根际土壤C/N和C/P大于荩草和双花草。3种植物根际土壤MBC/MBN差异不大。荩草和双花草非根际MBC/MBN和MBC/MBP均显著大于葛藤(P<0.05)。葛藤根际土壤MBC/MBP和MBN/MBP显著大于荩草和双花草(P<0.05)。相对中国和世界土壤平均水平,3种植物根际和非根际土壤具有较高的C/N和MBC/MBN,C/P、N/P、MBC/MBP和MBN/MBP均较低。③相关性分析表明,MBN、有机碳、总氮、总磷和速效氮之间具有极显著的正相关关系(P<0.01),但MBP只与速效磷有显著的正相关关系(P<0.01)。综合分析表明植物对植被混凝土基材养分固存起到了积极的作用,葛藤根际富集能力较强。此外,基材磷素含量过高,而氮素含量缺乏,基材养分配比不均衡。
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.
关键词
植被混凝土 /
生态修复 /
根际 /
土壤化学计量特征 /
微生物化学计量特征
Key words
vegetation-growing concrete /
ecological restoration /
rhizosphere /
soil stoichiometry /
microbial stoichiometry
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基金
国家重点研发计划项目(2017YFC0504902-04);国家自然科学基金项目(51678348);三峡库区生态环境教育部工程研究中心开放基金(KF2016-04)
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