Closing the Loop on Phosphorus Loss from Intensive Agricultural Soil: A Microbial Immobilization Solution?

Zhang, Lin; Ding, Xiaodong; Yi, Peng; George, Timothy S.; Feng, Gu

doi:10.3389/fmicb.2018.00104

Cited by 42 publications

(25 citation statements)

References 30 publications

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“…At low C:P ratios, bacteria mobilize more P thus enhancing plant P uptake. At high C:P ratios, microbial biomass P becomes stable as bacteria immobilize P, and this reduces P availability for plant uptake (Zhang et al, ). Low C:P ratios are often interpreted as indications of C limitation relative to P in a given LUC.…”

Section: Methodsmentioning

confidence: 99%

“…The C:N:P:S stoichiometry determines key biogeochemical processes including nutrient inputs and outputs, SOM mineralization patterns, and nutrient imbalances associated with changes in land use (Frossard et al, ; Tipping et al, ; Xu et al, ). Stoichiometric relationships in the soil also influence SOC sequestration and greenhouse gas emissions (van Groenigen et al, ; Yang et al, ) and the loss of soil nutrients from intensive agricultural systems (Zhang, Ding, Peng, George, & Feng, ).…”

Section: Introductionmentioning

confidence: 99%

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Soil structural degradation and nutrient limitations across land use categories and climatic zones in Southern Africa

Tamene¹,

Sileshi

Ndengu³

et al. 2019

Land Degrad Dev

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Although soil degradation is a major threat to food security and carbon sequestration, our knowledge of the spatial extent of the problem and its drivers is very limited in Southern Africa. Therefore, this study aimed to quantify the risk of soil structural degradation and determine the variation in soil stoichiometry and nutrient limitations with land use categories (LUCs) and climatic zones. Using data on soil clay, silt, organic carbon (SOC), total nitrogen (N), available phosphorus (P), and sulfur (S) concentrations collected from 4,468 plots on 29 sites across Angola, Botswana, Malawi, Mozambique, Zambia and Zimbabwe, this study presents novel insights into the variations in soil structural degradation and nutrient limitations. The analysis revealed strikingly consistent stoichiometric coupling of total N, P, and S concentrations with SOC across LUCs. The only exception was on crop land where available P was decoupled from SOC. Across sample plots, the probability (φ) of severe soil structural degradation was 0.52. The probability of SOC concentrations falling below the critical value of 1.5% was 0.49. The probabilities of soil total N, available P, and S concentrations falling below their critical values were 0.95, 0.70, and 0.83, respectively. N limitation occurred with greater probability in woodland (φ = .99) and forestland (φ = .97) than in cropland (φ = .92) and grassland (φ = .90) soils. It is concluded that soil structural degradation, low SOC concentrations, and N and S limitations are widespread across Southern Africa. Therefore, significant changes in policies and practices in land management are needed to reverse the rate of soil structural degradation and increase soil carbon storage.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Soil structural degradation and nutrient limitations across land use categories and climatic zones in Southern Africa

Tamene¹,

Sileshi

Ndengu³

et al. 2019

Land Degrad Dev

View full text Add to dashboard Cite

show abstract

“…Perhaps the most interesting approach to be applied in the conditions of Chilean volcanic soils (high total-P including the significant amounts of residual P together low available P) would be the improvement of P cycling, through an appropriate tillage and rotation management, to include cover crops and cash crops (like lupin, buckwheat, amaranthus, quinoa), all of them with high efficiency in P acquisition. Dealing with soil microbial biomass and recycling crops and wastes residues could be other interesting tools for mobilizing some fractions of residual P. An attractive point of view for Bclosing the loop on P loss from intensive agricultural soils^has recently been suggested by Zhang et al (2018) in terms of manipulating soil conditions for increasing P immobilization in microbial biomass (MB-P), which can be released to the soil solution during microbial turnover. According to this view, the turnover time of MB-P in the field can range from tens of days to 1 year (Zhang et al 2018), depending on several environmental conditions like climate, season, P application (forms and rates).…”

Section: Conclusion and Prospectsmentioning

confidence: 99%

“…Dealing with soil microbial biomass and recycling crops and wastes residues could be other interesting tools for mobilizing some fractions of residual P. An attractive point of view for Bclosing the loop on P loss from intensive agricultural soils^has recently been suggested by Zhang et al (2018) in terms of manipulating soil conditions for increasing P immobilization in microbial biomass (MB-P), which can be released to the soil solution during microbial turnover. According to this view, the turnover time of MB-P in the field can range from tens of days to 1 year (Zhang et al 2018), depending on several environmental conditions like climate, season, P application (forms and rates). Some studies have estimated that flux from microbial biomass can arrive near 37 kg/ha in grassland soils (Liebish et al 2014).…”

Section: Conclusion and Prospectsmentioning

confidence: 99%

Revisiting the Nature of Phosphorus Pools in Chilean Volcanic Soils as a Basis for Arbuscular Mycorrhizal Management in Plant P Acquisition

Borie

Aguilera

Castillo

et al. 2019

J Soil Sci Plant Nutr

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This review covers the nature, characteristics, and reactivity of soil organic matter (SOM) in volcanic soils and the phosphorus (P) accumulation mainly via the formation of stable complexes with organic and inorganic constituents to form P-containing macromolecules derived from both pedogenesis and fertilization. With the time, P accumulates as organic and inorganic compounds with differing lability, but the bulk appears to be recalcitrant. Chilean volcanic soils follow this same trend, subsequently having detrimental characteristics for plant growth, like the highly humified SOM and high P-sorption capacity. In addition, certain Chilean volcanic soils have high acidity, concomitant with a high exchangeable Al. As a result of the continuous application of P fertilizers, together with a low P efficiency of plant root acquisition, a BP reservoir^has built up, giving rise to the so-called residual P. This residual P consists of the inorganic and organic P, as macromolecular structures representing the cumulative average of several decades worth of agronomic P usage. Root modifications are an essential biological intervention to deal with this P accumulation. The general root modifications that are required to mobilize the residual P are discussed in the context of biochemical modifications (root exudations) and the symbiotic alterations by arbuscular mycorrhizal (AM) fungi. For a more efficient utilization of this accumulated P, however, it is essential to investigate the chemical nature and lability of these P forms in order to determine their capacity for plant acquisition and utilization. In this context, attention is focused on P fractionation and on some 31 P-NMR analysis of residual P constituents in Andisols. The major root trait evaluated and discussed here is the AM association, which is able to be extensively modified by management practices. Finally, some potential practices to avoid the excessive application of P fertilizers in volcanic soils by using technologies of P recycling, management of AM fungal populations, or agricultural management for mobilizing the accumulated residual P are outlined.

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“…For example, fructose released by AMF induces the expression of the phosphatase gene in the bacterial cell [43] . Importantly, the relationship between AMF and bacteria in P utilization can be regulated by the C:P ratio in soil [44] ; reducing soil C:P ratio by adding starter P fertilizer to Pdeficient soils can stimulate the P-solubilizing capacity of bacteria and improve plant P uptake [45] . AMF hyphae recruit bacteria that produce alkaline phosphatase and perform the functions, which are absent in fungal hyphae, to enhance soil organic P mineralization in situ in the field [44,46] .…”

Section: Phosphorus In the Mycorrhizospherementioning

confidence: 99%

Innovations of phosphorus sustainability: implications for the whole chain

Shen¹,

Wang²,

Jiao³

et al. 2019

Front. Agr. Sci. Eng.

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Phosphorus (P) is a non-renewable resource, therefore ensuring global food and environmental security depends upon sustainable P management. To achieve this goal, sustainable P management in the upstream and downstream sectors of agriculture from mineral extraction to food consumption must be addressed systematically. The innovation and feasibility of P sustainability are highlighted from the perspective of the whole P-based chain, including the mining and processing of P rock, production of P fertilizers, soil and rhizosphere processes involving P, absorption and utilization of P by plants, P in livestock production, as well as flow and management of P at the catchment scale. The paper also emphasizes the importance of recycling P and the current challenges of P recovery. Finally, sustainable solutions of holistic P management are proposed from the perspective of technology improvement with policy support.

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Closing the Loop on Phosphorus Loss from Intensive Agricultural Soil: A Microbial Immobilization Solution?

Cited by 42 publications

References 30 publications

Soil structural degradation and nutrient limitations across land use categories and climatic zones in Southern Africa

Soil structural degradation and nutrient limitations across land use categories and climatic zones in Southern Africa

Revisiting the Nature of Phosphorus Pools in Chilean Volcanic Soils as a Basis for Arbuscular Mycorrhizal Management in Plant P Acquisition

Innovations of phosphorus sustainability: implications for the whole chain

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