AI Article Synopsis
- The study explores how increased atmospheric CO levels, combined with biochar amendments, impact soil and medicinal plants, focusing on the interactions between plants and soil bacteria.
- Elevated CO (1000 ppm) and biochar (3% and 5% dosages) significantly enhanced soil's water retention, while higher CO levels reduced transpiration rates in the medicinal plant Pseudostellaria heterophylla.
- The research findings highlight that CO enrichment with biochar boosts bacterial diversity and richness, particularly increasing the abundance of important bacteria involved in carbon and nitrogen cycles in the rhizosphere.
Article Abstract
The increasing atmospheric CO concentration is a global concern that affects the plant-bacteria-soil system. Previous studies have investigated plant growth and bacteria activity under CO enrichment. However, the effects of coupled elevated CO and biochar amendment on the interactions of soil and medicinal plants are not well understood. This study aims to investigate the medicinal plant-soil hydraulic interactions and rhizosphere bacteria communities under coupled CO enrichment and biochar conditions. Two levels of CO concentration (400, 1000 ppm) and two biochar dosages (3%, 5% by mass) were considered. Pseudostellaria heterophylla was used as the tested medicinal plant. During plant growth, coupled CO enrichment and biochar at 3% and 5% dosage increased the volumetric water content at a matric suction of 33 kPa by 97% and 82% respectively, which indicates enhanced water retention. The transpiration rate of P. heterophylla was slightly reduced by 11-30% with an increase in biochar dosage due to higher total suction, while it was significantly reduced by up to 57% due to CO enrichment. In the rhizosphere of P. heterophylla, elevated CO (1000 ppm) coupled with 3% biochar dramatically increase the relative abundance of Thaumarchaeota, which played an important role in C and N cycles. Moreover, coupled CO enrichment and biochar addition resulted in the highest bacterial richness, while 3% biochar at ambient CO induced the highest bacterial diversity. This study provides a basis for understanding the medicinal plant-bacteria-soil system under CO enrichment and biochar conditions.
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| http://dx.doi.org/10.1016/j.scitotenv.2024.174943 | DOI Listing |
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