Progressively decreased nitrogen-stimulation of soil phosphatase activity with long-term nitrogen addition

Chen, Ji; Moorhead, Daryl L.

doi:10.1016/j.apsoil.2021.104213

Cited by 9 publications

(4 citation statements)

References 7 publications

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“…Given that all living organisms seek to maintain a stoichiometric balance, plants and soil micro-organisms may adopt a series of Pacquisition strategies to offset the effects of N loading-induced P limitation (Chen & Moorhead, 2022;Lambers et al, 2013;Marklein & Houlton, 2012;Tian et al, 2020;Wen et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, N loading‐induced P limitation may affect soil C cycling (Ding et al, 2021). Given that all living organisms seek to maintain a stoichiometric balance, plants and soil micro‐organisms may adopt a series of P‐acquisition strategies to offset the effects of N loading‐induced P limitation (Chen & Moorhead, 2022; Lambers et al, 2013; Marklein & Houlton, 2012; Tian et al, 2020; Wen et al, 2021). For instance, vascular plants can increase P acquisition by releasing root exudates, forming symbiotic associations with mycorrhizal fungi or modifying root morphological traits (Jian et al, 2016; Vitousek et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

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Nitrogen loading enhances phosphorus limitation in terrestrial ecosystems with implications for soil carbon cycling

et al. 2022

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Increased human‐derived nitrogen (N) loading in terrestrial ecosystems has caused widespread ecosystem‐level phosphorus (P) limitation. In response, plants and soil micro‐organisms adopt a series of P‐acquisition strategies to offset N loading‐induced P limitation. Many of these strategies impose costs on carbon (C) allocation by plants and soil micro‐organisms; however, it remains unclear how P‐acquisition strategies affect soil C cycling. Herein, we review the literature on the effects of N loading on P limitation and outline a conceptual overview of how plant and microbial P‐acquisition strategies may affect soil organic carbon (SOC) stabilization and decomposition in terrestrial ecosystems. Excessive input of N significantly enhances plant biomass production, soil acidification, and produces plant litterfall with high N/P ratios, which can aggravate ecosystem‐level P limitation. Long‐term N loading can cause plants and soil micro‐organisms to alter their functional traits to increase P acquisition. Plants can release carboxylate exudates and phosphatases, modify root morphological traits, facilitate the formation of symbiotic associations with mycorrhizal fungi and stimulate the abundance of P‐mineralizing and P‐solubilizing micro‐organisms. Releasing carboxylate exudates and phosphatases could accelerate SOC decomposition, whereas changing symbiotic associations and root morphological traits (e.g. an increase in fine root length) may contribute to higher SOC stabilization. Increased relative abundances of P‐mineralizing and P‐solubilizing bacteria can accelerate P mining and SOC decay, which may decrease microbial C use efficiency and subsequently lower SOC sequestration. The trade‐offs between different plant P‐acquisition strategies under N loading should be among future research priorities due to their cascading impacts on soil C storage. Quantifying ecosystem thresholds for P adaption to increased N loading is important because P‐acquisition strategies are effective when N loading is below the N threshold. Moreover, understanding the response of P‐acquisition strategies at different levels of native soil N availability could provide insight to divergent P‐acquisition strategies across sites and ecosystems. Altogether, P‐acquisition strategies should be explicitly considered in Earth System Models to generate more realistic predictions of the effects of N loading on soil C cycling. Read the free Plain Language Summary for this article on the Journal blog.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nitrogen loading enhances phosphorus limitation in terrestrial ecosystems with implications for soil carbon cycling

et al. 2022

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“…Because of the negative impact of root systems on N consumption, which may decrease soil N availability and impede N acquisition by microorganisms, microbial N limitation may have increased (Du et al, 2020). The N requirement of microbes is conducive to stimulating their metabolism to a certain extent, thereby resulting in relative microbial C limitation during plant growth stages (Chen & Moorhead, 2022). In comparison with P, N deficiency in the northwest region is a key factor affecting microbial N limitation (Liu et al, 2020), inducing strong competition between soil microbes and crop species during plant growth.…”

Section: Discussionmentioning

confidence: 99%

Microbial nutrient limitation in rhizosphere soils of different food crop families: Evidence from ecoenzymatic stoichiometry

Wang

Gong

et al. 2022

Land Degrad Dev

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Microbial metabolism directly participates in soil nutrient recycling and ecosystem stability. Although the rhizosphere soil is one of the most active habitats, information on how microorganisms acquire nutrients based on ecoenzymatic stoichiometry is lacking, especially for major food crops under field conditions. Thus, this study aimed to explore the soil nutrient properties and microbial biomass concentrations as well as extracellular enzymatic activities and focused on carbon (C), nitrogen (N), and phosphorus (P) cycling of different crop types, including potato (Solanaceae), maize (cereal), soybean (Leguminosae), and buckwheat (Polygonaceae) in the arid area of northern Shaanxi, China. Microorganisms in the rhizosphere soil of four crops were subjected to relative C and N limitation tests based on ecoenzymatic activities.Among the crops, potato and soybean exhibited the maximum limitations. Linear regression analysis of soil nutrients, microorganisms (stoichiometric homeostasis), and threshold elemental ratio synthetically supported microbial metabolic limitations. This finding coincided with the highest and lowest microbial carbon use efficiencies in soybean (0.58) and potato (0.51), illustrating the distinguishing physiological responses of microbes. Partial least squares path modeling further confirmed that the soil microbial nutrient limitations were significantly regulated by soil nutrient properties and extracellular enzyme activities. Taken together, soil microbial metabolism in agricultural ecosystems was co-limited by relative C and N regardless of the main food crop families in this region in China (northern Loess Plateau). These observations clarified the nutrient cycling driven by soil elemental stoichiometry at the rootsoil interface in arid and oligotrophic ecosystems.

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“…First, the soil microbial community and a range of other reported soil variables were only measured once in 2017, 37 years after the initiation of the fertilization experiments. Caution is required when comparing these results with results from shortterm experiments since some variables likely respond differently to short-and long-term experimental durations [73][74][75]. Second, it is challenging to clarify the causal relationships between rice grain yield, yield stability, soil physical and chemical variables, and changes in soil microbial community composition due to the strong mutual and interactive effects among these processes.…”

Section: Uncertainties and Implicationsmentioning

confidence: 99%

New Insights from Soil Microorganisms for Sustainable Double Rice-Cropping System with 37-Year Manure Fertilization

et al. 2023

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Long-term intensive use of mineral fertilizers in double rice-cropping systems has led to soil acidification and soil degradation. Manure fertilization was suggested as an alternative strategy to mitigate soil degradation. However, the effects of long-term mineral and manure fertilization on rice grain yield, yield stability, soil organic carbon (SOC) content, soil total nitrogen (TN) content, and the underlying mechanisms are unclear. Based on a long-term experiment established in 1981 in southern China, we compared four treatments: no fertilizer application (Control); application of nitrogen–phosphorus–potassium (NPK); NPK plus green manure in early rice (M1); and M1 plus farmyard manure in late rice and rice straw return in winter (M2). Our results showed that 37 years of NPK, M1, and M2 significantly increased rice grain yield by 54%, 46%, and 72%, and yield stability by 22%, 17%, and 9%, respectively. M1 and M2 significantly increased SOC content by 39% and 23% compared to Control, respectively, whereas there was no difference between Control and NPK. Regarding soil TN content, it was significantly increased by 8%, 46%, and 20% by NPK, M1, and M2, respectively. In addition, M2 significantly increased bacterial OTU richness by 68%, Chao1 index by 79%, and altered the bacterial community composition. Changes in soil nutrient availability and bacterial Simpson index were positively correlated with the changes in grain yield, while shifts in bacterial community were closely related to yield stability. This study provides pioneer comprehensive assessments of the simultaneous responses of grain yield, yield stability, SOC and TN content, nutrient availability, and bacterial community composition to long-term mineral and manure fertilization in a double rice-cropping system. Altogether, this study spanning nearly four decades provides new perspectives for developing sustainable yet intensive rice cultivation to meet growing global demands.

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Progressively decreased nitrogen-stimulation of soil phosphatase activity with long-term nitrogen addition

Cited by 9 publications

References 7 publications

Nitrogen loading enhances phosphorus limitation in terrestrial ecosystems with implications for soil carbon cycling

Nitrogen loading enhances phosphorus limitation in terrestrial ecosystems with implications for soil carbon cycling

Microbial nutrient limitation in rhizosphere soils of different food crop families: Evidence from ecoenzymatic stoichiometry

New Insights from Soil Microorganisms for Sustainable Double Rice-Cropping System with 37-Year Manure Fertilization

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