Article
Engineering, Environmental
Longfei Jiang, Chunling Luo, Dayi Zhang, Mengke Song, Weiping Mei, Yingtao Sun, Gan Zhang
Summary: This study investigated the role of ryegrass in phenanthrene degradation in soils using DNA stable isotope probing (SIP) and metagenomics to unravel potential explanations for conflicting results in phytoremediation studies. The research found that ryegrass can enhance phenanthrene biodegradation efficiency and impact microbial community structure in the rhizosphere through carbohydrate metabolism, particularly fumaric acid. This suggests that rhizosphere effect on phenanthrene degradation efficiency may depend on the presence of active degraders with advantages in carbohydrate and fumaric acid metabolism.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Environmental Sciences
Yuanzhou Xu, Xinyue Zhang, Zhuoliang Xiao, Fei Wang, Mingyue He, Yunyun Li, Ting Che, Yajuan Li, Xiayun Zang, Huixin Li, Feng Hu, Li Xu
Summary: Plant growth and environmental concentration have an impact on the uptake of fluoranthene by plants, yet their specific contributions remain poorly evaluated. In this study, ryegrass was exposed to different concentrations of fluoranthene to investigate its uptake mechanism. The results showed that fluoranthene absorption capacity was stronger in the roots than in the leaves. The bioconcentration and translocation factors of fluoranthene were highest at a concentration of 5 mg/L. Plant growth and substance synthesis indices exhibited a similar pattern to the bioconcentration factor, while antioxidant enzyme activities showed a concentration-dependent response.
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
(2023)
Article
Immunology
Niknaz Riazati, Mary E. Kable, John W. Newman, Yuriko Adkins, Tammy Freytag, Xiaowen Jiang, Charles B. Stephensen
Summary: The study found that Trp metabolites produced by intestinal bacteria were not strongly associated with immune markers in healthy adults; however, the Kyn/Trp ratio was strongly associated with markers of systemic inflammation and acute phase response; commensal bacteria associated with lower levels of bacterial Trp metabolites were linked to greater immune activation.
FRONTIERS IN IMMUNOLOGY
(2022)
Article
Soil Science
Tianli Bao, Xiaoguang Jiao, Xueqin Yang, Mingxiang Xu, Wen Li, Yu Qiao, Liqian Gao, Yunge Zhao
Summary: The study demonstrates that the microbial community structure in biocrusts can be improved and sustained over the long term under moderate disturbance. This improvement is associated with changes in cyanobacterial biomass, available N, soil moisture, vegetation coverage, and the C/N ratio.
Article
Environmental Sciences
Chotinan Junpradit, Patsaraporn Thooppeng, Kannika Duangmal, Benjaphorn Prapagdee
Summary: This study demonstrated that Streptomyces rapamycinicus and Streptomyces cyaneus could enhance plant growth and cadmium uptake in Chlorophytum comosum, showing potential for phytoremediation of cadmium-polluted soil.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Environmental Sciences
Ze Lv, Xingguo Li, Yujia Wang, Xiaomin Hu, Jing An
Summary: The combined pollution of galaxolide (HHCB) and cadmium (Cd) had a greater influence on the soil microbial community than the single pollution of HHCB, as measured by phospholipid fatty acid (PLFA) analysis. Addition of Cd led to a significant decrease in total microbial biomass and Gram-positive/Gram-negative bacteria ratio, while increasing the bacteria/fungi ratio. Principal component analysis (PCA) and redundancy analysis (RDA) confirmed that the microbial community structure was significantly altered by the combined effects of HHCB and Cd.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Forestry
Ya Shen, Shichen Xiong, Chengming You, Li Zhang, Yu Li, Zongwen Hong, Yifan Hu, Jing Li, Han Li, Lixia Wang, Sining Liu, Bo Tan, Zhenfeng Xu
Summary: This study investigated the impact of stand age on soil microbial communities, revealing that soil microbial biomass is significantly influenced by stand age and soil depth. The biomass of functional microbial groups increased rapidly in younger stands but leveled off in older stands. Soil organic carbon and ammonium nitrogen were found to be the primary drivers of changes in soil microbial biomass and community composition.
Article
Soil Science
Tinghui Yang, Xiaojuan Li, Bin Hu, Dandan Wei, Zilong Wang, Weikai Bao
Summary: This study investigated the latitudinal patterns of soil microbial biomass and community composition in arid valleys of southwest China. The results showed that soil microbial biomass increased with latitude, while specific microbial groups were influenced by vegetation properties and soil nutrients. Climate, vegetation, and soil properties were identified as crucial drivers of changes in soil microbial communities with latitude.
Article
Forestry
Zhuanzhuan Sun, Peilei Hu, Wei Zhang, Dan Xiao, Dongsheng Zou, Yingying Ye, Kelin Wang
Summary: This study compared managed and natural vegetation restorations and found that both types can increase soil microbial community abundance, although it still falls short of the abundance found in mature forests. Soil organic carbon and total nitrogen were identified as the primary factors influencing microbial abundance, while mean annual temperature was recognized as the primary factor contributing to variation in microbial community structure.
Article
Soil Science
Xiaohua Wan, Zaipeng Yu, Mengjuan Wang, Yu Zhang, Manuel Esteban Lucas-Borja, Zhiqun Huang
Summary: This study explored how tree species richness affects soil microbial biomass and community composition through functional trait variation and community-weighted trait means. The findings indicated that an increase in tree species richness decreased total microbial biomass in the soil, with implications on gram-positive to gram-negative bacteria ratio and fungi to bacteria ratio based on leaf nitrogen content and leaf dry matter content traits.
SOIL BIOLOGY & BIOCHEMISTRY
(2022)
Article
Plant Sciences
Hongbiao Zi, Lei Hu, Changting Wang
Summary: Short-term nitrogen and phosphorus addition have significant effects on soil microbial communities and enzyme activities in alpine meadows, and these effects are rate dependent. Nitrogen addition decreases soil microbial biomass, while phosphorus addition inhibits enzyme activities at low rates and increases enzyme activities at high rates.
FRONTIERS IN PLANT SCIENCE
(2022)
Article
Soil Science
Jungang Chen, Biao Zhu, Yunhai Zhang
Summary: The overuse of antibiotics has caused serious concerns worldwide as it may lead to significant changes in soil microbial communities, thereby threatening soil ecosystems. However, the effects of antibiotics on soil microbial biomass and community structure on a global scale are still unclear. Using 66 paired observations, we conducted one of the first global meta-analyses to evaluate the effects of various antibiotics on soil microbial communities and explore the underlying mechanisms. Our findings show that antibiotics suppressed soil microbial biomass, bacterial biomass, and fungal biomass, with the ratio of bacteria to fungi biomass decreasing for all antibiotic types. The negative effects of antibiotics on soil microbial community and bacteria biomass diminished over time, and the response of bacteria biomass to antibiotics varied with latitude, regulated by temperature, precipitation, soil pH, and total nitrogen.
APPLIED SOIL ECOLOGY
(2023)
Article
Environmental Sciences
Pingping Wei, Anping Lei, Haichao Zhou, Zhangli Hu, Yukshan Wong, Nora F. Y. Tam, Qun Lu
Summary: This study compared the microbial community structure and function in sediments of a 17-year-old natural regenerated mangrove forest with the original forest, finding no significant differences in microbial metabolism of carbon substrates but lower enzyme activities in the regenerated forest. Seasonal differences in enzyme activities and microbial characteristics were significant in both forests, with the regenerated forest showing higher sensitivity. Correspondence analysis suggested that sediment microbial characteristics in natural regenerated mangroves could be restored.
MARINE POLLUTION BULLETIN
(2021)
Article
Soil Science
Emmanuel Amoakwah, Emmanuel Arthur, Kwame A. Frimpong, Nicola Lorenz, Mohammad Arifur Rahman, Generose Nziguheba, Khandakar R. Islam
Summary: This study found that biochar application in a tropical ecosystem can significantly increase microbial biomass and activity, as well as enhance soil enzyme activity and related biological properties. The treatment with 30-ton biochar ha(-1) had the most pronounced effects on the composition of microbial communities, with a higher fungal to bacterial ratio and increased carbon sequestration potential.
APPLIED SOIL ECOLOGY
(2022)
Article
Green & Sustainable Science & Technology
Min Dong, Na Sun, Chunguang Liu
Summary: The role of bromide ions (Br-) in the phytodegradation of emerging phenolic pollutants (EPPs) and its mechanism in wheat resistance to EPPs stress were investigated. The study found that Br- enhanced the removal of EPPs in a dark hydroponic wheat system and improved the antioxidant potential of wheat to alleviate EPPs stress. This is the first report showing that Br- could stimulate the synthesis of indole-3-acetic acid (IAA) and hydrolysis of IAA-conjugates. The study provides support for the feasibility of phytoremediation techniques for phenolic pollutants and references for the assessment of ecological risks and health hazards of EPPs.
JOURNAL OF CLEANER PRODUCTION
(2023)