Distinct response patterns of plants and soil microorganisms to agronomic practices and seasonal variation in a floodplain ecosystem

Yu, Yanyan; Líu, Hao; Zhang, Lanlan; Sun, Zhongjie; Lei, Binghai; Miao, Yuan; Chu, Haiyan; Han, Shijie; Shi, Yu; Zheng, Junqiang

doi:10.3389/fmicb.2023.1094750

Cited by 6 publications

(2 citation statements)

References 77 publications

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“…Floodplain farmland is one of the most productive agricultural ecosystems due to its fertile alluvial soil [1][2][3]. Seasonal flooding causes fertile sediment to settle in low-lying areas and sufficient irrigation water sources promote crop growth, allowing many crop residues to enter the soil [4][5][6]. Consequently, floodplain farmland has great potential for soil carbon sequestration.…”

Section: Introductionmentioning

confidence: 99%

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Mapping Soil Organic Carbon in Floodplain Farmland: Implications of Effective Range of Environmental Variables

Chen

Zhu

et al. 2023

Land

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Accurately mapping soil organic carbon (SOC) is conducive to evaluating carbon storage and soil quality. However, the high spatial heterogeneity of SOC caused by river-related factors and agricultural management brings challenges to digital soil mapping in floodplain farmland. Moreover, current studies focus on the non-linear relationship between SOC and covariates, but ignore the effective range of environmental variables on SOC, which prevents the revelation of the SOC differentiation mechanism. Using the 375 samples collected from the Jiangchang Town near Han River, we aim to determine the main controlling factors of SOC, reveal the effective range of environmental variables, and obtain the spatial map of SOC by using the gradient boosting decision tree (GBDT) model and partial dependence plots. Linear regression was used as a reference. Results showed that GBDT outperformed linear regression. GBDT results show that the distance from the river was the most important SOC factor, confirming the importance of the Han River to the SOC pattern. The partial dependence plots indicate that all environmental variables have their effective ranges, and when their values are extremely high or low, they do not respond to changes in SOC. Specifically, the influential ranges of rivers, irrigation canals, and rural settlements on SOC were within 4000, 200, and 50 m, respectively. The peak SOC was obtained with high clay (≥31%), total nitrogen (≥1.18 g/kg), and total potassium contents (≥11.1 g/kg), but it remained steady when these covariates further increased. These results highlight the importance of revealing the effective range of environmental variables, which provides data support for understanding the spatial pattern of SOC in floodplain farmland, achieving carbon sequestration in farmland and precision agriculture. The GBDT with the partial dependence plot was effective in SOC fitting and mapping.

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Section: Introductionmentioning

confidence: 99%

“…In addition to the above-mentioned soil forming factors, rivers also control the process and spatial pattern of the SOC in the floodplain. River flooding redistributes the soil properties through the process of erosion and sedimentation [4,5]. The effect of rivers on soil properties weakens as the distance increases.…”

Section: Introductionmentioning

confidence: 99%

Mapping Soil Organic Carbon in Floodplain Farmland: Implications of Effective Range of Environmental Variables

Chen

Zhu

et al. 2023

Land

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Can biostimulants and tillage rotations improve dryland crop productivity and soil microbes?

Tshuma,

Bennett,

Swanepoel

et al. 2024

Agronomy Journal

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Soil microbes are essential for soil nutrient cycling. However, frequent tillage and the use of synthetic agrochemicals can reduce soil microbial diversity and enzyme activity. In this study, the effects of four tillage treatments (mouldboard plough, shallow tine‐tillage, no‐tillage, and tillage rotation) and two rates of synthetic agrochemicals (standard and reduced, with biostimulants) on soil microbial diversity and enzyme activity were investigated between 2018 and 2020 in a Mediterranean climate zone in South Africa. It was hypothesized that a reduction in tillage frequency and quantity of synthetic agrochemical application would lead to greater microbial diversity and enzyme activity. Soil samples were collected from the 0‐ to 150‐mm layer of a field trial under a dryland crop rotation system. Soil microbial species richness and abundance were assessed using the Shannon–Wiener diversity and evenness indices. The activities of four microbial enzymes—β‐glucosidase, acid phosphatase, alkaline phosphatase, and urease—were used to evaluate ecosystem functioning. The combined effects of tillage rotation with a shallow tine implement and the application of biostimulants failed to significantly improve soil microbial diversity, enzyme activity, and crop productivity relative to other treatments. However, the combination did not reduce the wheat (Triticum aestivum) grain yield and quality, and soil biological parameters. Furthermore, the less intensive tillage treatments, ST, NT, and ST‐NT‐NT‐NT, resulted in higher enzyme activity than the mouldboard treatment. Therefore, we suggest that combining non‐intensive tillage with reduced synthetic agrochemical use can be a safer, more environmentally friendly alternative to intensive tillage and high agrochemical application in dryland cropping systems.

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Fertilization regime changes rhizosphere microbial community assembly and interaction in Phoebe bournei plantations

Yan,

Wu,

et al. 2024

Appl Microbiol Biotechnol

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Fertilizer input is one of the effective forest management practices, which improves soil nutrients and microbial community compositions and promotes forest productivity. However, few studies have explored the response of rhizosphere soil microbial communities to various fertilization regimes across seasonal dynamics. Here, we collected the rhizosphere soil samples from Phoebe bournei plantations to investigate the response of community assemblages and microbial interactions of the soil microbiome to the short-term application of four typical fertilizer practices (including chemical fertilizer (CF), organic fertilizer (OF), compound microbial fertilizer (CMF), and no fertilizer control (CK)). The amendments of organic fertilizer and compound microbial fertilizer altered the composition of rhizosphere soil bacterial and fungal communities, respectively. The fertilization regime significantly affected bacterial diversity rather than fungal diversity, and rhizosphere fungi responded more sensitively than bacteria to season. Fertilization-induced fungal networks were more complex than bacterial networks. Stochastic processes governed both rhizosphere soil bacterial and fungal communities, and drift and dispersal limitation dominated soil fungal and bacterial communities, respectively. Collectively, these findings demonstrate contrasting responses to community assemblages and interactions of rhizosphere bacteria and fungi to fertilizer practices. The application of organic fertilization strengthens microbial interactions and changes the succession of key taxa in the rhizosphere habitat. Key points • Fertilization altered the key taxa and microbial interaction • Organic fertilizer facilitated the turnover of rhizosphere microbial communities • Stochasticity governed soil fungal and bacterial community assembly

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Distinct response patterns of plants and soil microorganisms to agronomic practices and seasonal variation in a floodplain ecosystem

Cited by 6 publications

References 77 publications

Mapping Soil Organic Carbon in Floodplain Farmland: Implications of Effective Range of Environmental Variables

Mapping Soil Organic Carbon in Floodplain Farmland: Implications of Effective Range of Environmental Variables

Can biostimulants and tillage rotations improve dryland crop productivity and soil microbes?

Fertilization regime changes rhizosphere microbial community assembly and interaction in Phoebe bournei plantations

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