Phosphorus fertilization alters complexity of paddy soil dissolved organic matter

Zhang, Zhijian; Wang, Xian-Zhe; Liang, Luyi; Huang, En; Tao, Xing-Hua

doi:10.1016/s2095-3119(20)63215-4

Cited by 15 publications

(10 citation statements)

References 45 publications

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“…N addition also increases the input of DOM from litter and inhibits the biodegradation of DOM (Mao et al, 2020). The increase in the soil DOM content following P addition (Table 2) might be partly due to the rapid growth of microorganisms, because P application may accelerate the production of active C sources, thereby contributing to a higher input of DOM from microbial sources (Zhang et al, 2020). Soil DOM mainly originates from dead leaves and soil humus, and it is gradually formed through humification and leaching (Liang et al, 1997).…”

Section: Discussionmentioning

confidence: 99%

“…This was probably due to the change in the composition of the microbial community following the increase in AP, which led to a more unstable C source for microorganisms. Furthermore, P addition may accelerate the production of active C sources, thereby contributing to a higher input of DOM from microbial sources (Zhang et al, 2020). The addition of inorganic N provided the N source for nitrification by soil microorganisms, and the number of nitrifying bacteria in the soil increased rapidly after urea application; this further increased the source of microorganisms to a certain extent (Fan & Zhu, 2002).…”

Section: Discussionmentioning

confidence: 99%

Section: Influence Of Nutrient Addition On the Composition And Chemic...mentioning

confidence: 99%

“…P input also reduced the structural complexity of DOM, with a blue shift in fluorescence signals. The fluorescence index of DOM increased by 4%-5% with the increase in P application, while the humification index decreased by 8%-13% (Zhang et al, 2020). Therefore, it is essential to identify soil DOM storage and composition parameters, particularly under conditions of environmental changes.…”

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confidence: 99%

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Effects of nutrient addition on the composition and chemical characteristics of soil dissolved organic matter in a desert steppe in northern China

Liu,

Wu,

Xue

et al. 2023

Land Degrad Dev

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Dissolved organic matter (DOM) plays a critical role in ecosystem function and productivity, particularly in carbon (C) cycling in grassland ecosystems. However, changes in the structural complexity of DOM in a desert steppe following long‐term treatment with nitrogen (N) and phosphorus (P) remain unclear; this limits our understanding of the nutrient‐related soil C cycle in a desert steppe. In the present study, soil experiments were conducted in the 0–10 cm soil layer of a desert steppe in northern China from 2017 to 2021, and four treatments were established: P, N, N + P (NP), and no nutrient addition (CK). The content and chemical composition of soil DOM were determined by ultraviolet–visible absorbance, fluorescence, and Fourier transform infrared spectroscopy. Compared to CK treatment, nutrient addition increased soil DOM content by 2.86%–53.84%. NP addition increased the average molecular weight, aromaticity, and humification degree of soil DOM. The DOM source was attributed to the combination of foreign and local sources. Fluorescent components of the DOM samples were mainly proteins and humic acids; the humic acid content decreased after N addition and increased after P and NP addition. Nutrient availability and pH were the key factors affecting the changes in the source and average molecular weight of the DOM, respectively. The soil organic matter content was significantly positively correlated with the humification index (r = 0.96). These results imply that nutrient addition accelerates the accumulation of DOM and influences its structural complexity; this potentially benefits soil C sequestration in a desert steppe.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Influence Of Nutrient Addition On the Composition And Chemic...mentioning

confidence: 99%

mentioning

confidence: 99%

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Effects of nutrient addition on the composition and chemical characteristics of soil dissolved organic matter in a desert steppe in northern China

Liu,

Wu,

Xue

et al. 2023

Land Degrad Dev

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“…The sensitivity of SOM degradation to changes in temperature may be controlled by the decomposition of recalcitrant and stabilised SOM, which is considered to block the production of available substrates and the access of enzyme to molecules (Ågren & Wetterstedt, 2007;Davidson & Janssens, 2006). Previous studies have reported that exogenous P additions altered the complexity and amount of soil C (Liu et al, 2014;Zhang et al, 2020). Here, we also found that the oxidase activity and the activity ratio of βG to oxidase, an index of the chemical complexity and recalcitrance of SOM, were altered in the P-treated soils (Figure 1).…”

Section: Influence Of N and P On The Temperature Sensitivity Of Som D...mentioning

confidence: 99%

Warming causes variability in SOM decomposition in N‐ and P‐fertiliser‐treated soil in a subtropical coniferous forest

Tang

Wang

Meng

et al. 2022

European J Soil Science

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Both temperature and nutrient availability have essential roles in regulating the decomposition of soil carbon (C) and nitrogen (N), the main controls on organic matter accumulation in forest ecosystems. However, there is a lack of information about how N deposition and phosphorus (P) additions might impact soil C and N decomposition rates in subtropical forests under climate warming. We measured soil organic C and N mineralisation rates and corresponding exoenzyme activities in a subtropical forest soil that had received N and/or P additions for six years in experimental conditions at a range of temperatures between 10 and 40°C. Our results showed that soil organic C and N decomposition rates were positively correlated with the activities of their corresponding enzymes, which suggests that the extracellular enzyme activities could be the main influence on soil organic matter (SOM) decomposition rates. N additions had a significant positive effect on soil organic C mineralisation and enhanced oxidase and hydrolase activities. P additions had little effect on soil organic C and N decomposition rates. These results challenge the assumptions that soil microorganisms are N‐rich and P availability restricts organic matter decomposition, and provides additional evidence that N, not P, regulates organic matter decomposition in subtropical forests. While N additions significantly influenced the soil C and N decomposition rates, they had little effect on their sensitivity to temperature. In contrast, P additions had a significant effect on the temperature sensitivities of SOM decomposition and the βG and NAG Vmax. Overall, our results show that SOM decomposition is vulnerable to both N and P additions, and both should be considered when predicting how SOM decomposition and C cycling might change under warming. Highlights The effect of N and/or P additions on the temperature sensitivity of SOM decomposition was explored. N stimulated soil organic C decomposition rates and corresponding enzyme activities. P promoted the sensitivity of SOM decomposition to temperature changes. N and P additions could affect the stability of SOM in subtropical forests in the future.

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Spatiotemporal response of the optical characteristics of dissolved organic matter to seasonality and land use in tropical island rivers

Xiao,

Wei,

Wang

et al. 2024

Environ Geochem Health

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Phosphorus fertilization alters complexity of paddy soil dissolved organic matter

Cited by 15 publications

References 45 publications

Effects of nutrient addition on the composition and chemical characteristics of soil dissolved organic matter in a desert steppe in northern China

Effects of nutrient addition on the composition and chemical characteristics of soil dissolved organic matter in a desert steppe in northern China

Warming causes variability in SOM decomposition in N‐ and P‐fertiliser‐treated soil in a subtropical coniferous forest

Spatiotemporal response of the optical characteristics of dissolved organic matter to seasonality and land use in tropical island rivers

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