Plant–microbial linkages regulate soil organic carbon dynamics under phosphorus application in a typical temperate grassland in northern China

Shi, Jiayu; Gong, Jirui; Li, Xiaobing; Zhang, Zihe; Zhang, Weiyuan; Liu, Ying; Song, Liangyuan; Zhang, Siqi; Dong, Jiaojiao; Baoyin, Taogetao

doi:10.1016/j.agee.2022.108006

Cited by 25 publications

(18 citation statements)

References 66 publications

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“…The TOC of sediments ranged from 1.03-2.10 g/kg, with an average of 1.44 g/kg (n = 51), a maximum at 100-110 cm, and a minimum at 120-130 cm. Its content is similar to that of most coastal zones (Fang and Wang, 2021;Xia et al, 2022), but it's significantly lower than that of terrestrial soil environment (Yan et al, 2021;Shi et al, 2022). The N was 0.20-0.44 g/kg, with a maximum at 160-170 cm and a minimum at 120-130 cm.…”

Section: Geochemical Profile Of Sedimental Components and Tocmentioning

confidence: 73%

Vertical distribution of Fe, P and correlation with organic carbon in coastal sediments of Yellow Sea, Eastern China

Gao

Chen

et al. 2023

Front. Mar. Sci.

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The coastal zone is considered as a major carbon pool. Iron minerals and phosphates are vital factors affecting the amounts and occurrence of total organic carbon (TOC) in sediments. However, coupling mechanisms of iron (Fe) and phosphorous (P) in the source-sink transition of TOC in coastal sediments is poorly understood. This study characterized the distribution of Fe, P and TOC contents of three independent 170 cm sediment cores sampled from a coastal aquaculture area in the eastern Jiangsu Province, and quantified the correlations among Fe, P, median grain diameter (Dx(50)), and TOC. The results showed total phosphorus (TP) content ranges in a scope of 337.4-578.0 mg/kg, and many depths recorded moderate P eutrophication. Inorganic phosphorus (DA + IP) and biogenic apatite were the primary components of TP, accounting for 25.19–55.00 and 26.71–49.62%, respectively. The Fe contents varied from 987.9 mg/kg to 2900.7 mg/kg, in which oxidized iron (Feox) accounted for about 62.2–79.4%. In the vertical profile, the TOC was positively correlated with the contents of low-crystallinity Fe-bearing carbonates (Fecarb), high crystallinity pyrite (FePy), iron-bound phosphorus (PCDB), manganeses (Mn), and nitrogen (N), while it was negatively correlated with DA + IP, organic phosphorus (OP), and Dx(50). Based on the the partial least squares (PLS) model, we proposed that the higher FePy, Mn, magnetite (FeMag), Fecarb, PCDB, amorphous exchangeable Fe (Ex-Fe), and authigenic apatite phosphorus (Bio-P) in sediments represent the high capacity for TOC sink, whereas, higher DA + IP, and OP indicate a TOC conversion to the source. The non-siginificat indication of Feox on TOC source-sink is due to its surplus and strong reactivity relative to TOC content. These revealed correlations provide a theoretical reference for understanding and regulating the burial rate and storage of TOC by changing the input of Fe minerals and P components into coastal sediments.

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Section: Geochemical Profile Of Sedimental Components and Tocmentioning

confidence: 73%

Vertical distribution of Fe, P and correlation with organic carbon in coastal sediments of Yellow Sea, Eastern China

Gao

Chen

et al. 2023

Front. Mar. Sci.

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“…This was linked to microbial ecology based on life history strategies. Proteobacteria, Bacteroides, and Firmicutes were r‐strategy bacteria and sensitive to easily decomposable C sources, indicating that these bacteria had a substrate preference and degraded more easily utilization substrate and then mediated N functional properties in MCBP forest (Jiang et al, 2021; Shi et al, 2022). There are many easy substrates (i.e., cellulose and hemicellulose) in BP and MCBP litter that can be easily degraded by microbes, which led to the increase in the abundance of r‐strategy bacteria and drive the N metabolic process (Wang, Zhang, et al, 2020).…”

Section: Discussionmentioning

confidence: 99%

Mixed plantation forest litter improves microbial nitrogen transformation by increasing nitrogen metabolism related genes and key bacterial taxa in northern China

Wu,

Yin,

Liu

et al. 2024

Land Degrad Dev

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Nitrogen (N) metabolism is a key metabolic pathway of nutrient cycling in forest ecosystems. However, the mechanisms by which mixed plantation forest litter improves microbial N transformation are poorly understood. Thus, we investigated the N characteristics, N metabolism‐related genes, and key microbial modules of litter and soil in three types of forests: coniferous (CP forest), broadleaf (BP forest), and mixed forests (MCBP forest). Results indicated that the total N (TN), total hydrolysable organic N (THON), and percentage values of NH4+‐N/TN and NO3−‐N/TN in BP forest and MCBP forest litter were higher than those of CP forest litter, which was attributed to the increase in abundance of N fixation genes and dissimilatory nitrate reduction genes. The MCBP forest increased the bacterial number and diversity, and the abundance of key bacterial taxa. Bacterial key modules 1 and 2 were identified, consisting of Acidobacteria, Actinobacteria, Chloroflexi, Nitrospirae, Proteobacteria, and Gemmatimonadetes, while archaeal module 5 was also a key module, comprising Thaumarchaeota and Euryarchaeota. Nutrients were the limiting factor of key microbial modules in the decomposition of litter, further influencing N metabolism‐related genes and enzymes. Therefore, mixed plantation forests increased microbial N fixation and transformation during litter decomposition in northern China.

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“…These oligotrophic bacteria are thought to have the potential ability to break down nutrient-poor and refractory substrates, thereby promoting the growth of copiotrophic bacteria such as Alphaproteobacteria ( Zhou et al, 2015 ). This also implies that A. sinicus returned to the soil may have shifted microbial life-history strategies, which transitioned from the K-strategy to the r-strategy ( Shi et al, 2022 ). Therefore, the changes in the soil environment brought about by A. sinicus preferentially supported the growth of copiotrophic bacteria (e.g., some Proteobacteria) rather than oligotrophic bacteria (e.g., some Acidobacteria).…”

Section: Discussionmentioning

confidence: 99%

The moderate substitution of Astragalus sinicus returning for chemical fertilizer improves the N cycle function of key ecological bacterial clusters in soil

Wang

Chen

et al. 2023

Front. Microbiol.

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Astragalus sinicus (Chinese milk vetch) is a well-established resource of organic fertilizer widely used in paddy soil to partially replace chemical fertilizers. However, the influence of returning A. sinicus to fields on the soil bacterial community remains poorly understood. Here, we used different amounts of A. sinicus partially replacing chemical fertilizers and investigated the changes in soil physicochemical factors and the soil bacterial community structure responses. Returning A. sinicus to the field significantly increased the soil total nitrogen and available phosphorus content (p < 0.05). Weighted gene correlation network analysis (WGCNA) was applied to detect significant associations between the soil microbiome data and physicochemical factors. Two key ecological bacterial clusters (MEturquoise and MEgreen), mainly containing Acidobacteria, Proteobacteria, and Chloroflexi, were significantly correlated with soil nitrogen (N) levels. A. sinicus partially replacing chemical fertilizers reduced the normalized stochasticity ratio (NST) of rare amplicon sequence variants (ASVs), abundant ASVs, MEturquoise, and MEgreen (p < 0.05). Our results further indicated that a moderate amount of A. sinicus returned to the soil effectively mitigated the trend of reduced relative abundance of N fixation function of key ecological clusters caused by chemical fertilizer. However, a large amount of A. sinicus led to a significant increase in relative abundance of denitrification function and a significant decrease in relative abundance of N fixation function of key ecological clusters. This implies that the moderate substitution of A. sinicus returning for chemical fertilizer improves the N cycling function of key ecological bacterial clusters in soil. From the perspective of the bacterial community in paddy soil, this study provides new insight and a reference on how to find a good balance between the amount of A. sinicus returned to the soil and ecological safety.

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Plant–microbial linkages regulate soil organic carbon dynamics under phosphorus application in a typical temperate grassland in northern China

Cited by 25 publications

References 66 publications

Vertical distribution of Fe, P and correlation with organic carbon in coastal sediments of Yellow Sea, Eastern China

Vertical distribution of Fe, P and correlation with organic carbon in coastal sediments of Yellow Sea, Eastern China

Mixed plantation forest litter improves microbial nitrogen transformation by increasing nitrogen metabolism related genes and key bacterial taxa in northern China

The moderate substitution of Astragalus sinicus returning for chemical fertilizer improves the N cycle function of key ecological bacterial clusters in soil

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