Changes in water content of two agricultural soils does not alter labile P and C pools

Butterly, Clayton R.; McNeill, Ann; Baldock, J. A.; Marschner, Petra

doi:10.1007/s11104-011-0931-7

Cited by 11 publications

(9 citation statements)

References 73 publications

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“…Previous research has mainly focused on surface soil (<20 cm) responses to dryingwetting [11,14,15]; a few studied subsurface soils (20-100 cm) [39,40]; and, even fewer studied deep soil carbon (>100 cm) [17,23]. Data similar to that of the current study are rare in demonstrating an active microbial community and active C pool, as evidenced by soil respiration, down to as much as three meters.…”

Section: Discussionmentioning

confidence: 49%

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Drying-Wetting Cycles: Effect on Deep Soil Carbon

Markewitz

Foroughi

et al. 2018

Soil Systems

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In the Southeast United States (U.S.), the climate is predicted to be warmer and have more severe drought in the summer. Decreasing rainfall in summer months should create more severe soil drying, which will eventually affect re-wetting cycles deeper in the soil profile. Changing drying-wetting cycles in this deeper portion of the profile may impact the soil C pool, the largest pool of terrestrial C globally. The aim of this research is to study the effect of drying-wetting cycles on deep soil C. A soil incubation experiment was established using four soils that are part of a simulated drought experiment in Oklahoma, Virginia, Georgia, and Florida. Soils were incubated from as many as eight layers up to a depth of 3.0 m. During incubations, soil respiration was generally greatest in surface soils and declined with depth. When compared to soils that were kept constantly moist, drying-wetting cycles did not consistently stimulate more soil respiration. Soil respiration as a proportion of total soil C, however, was higher in soils below 1 m than above. Total C (R 2 = 0.82) and hydrolysable C (R 2 = 0.77) were the best predictors for soil respiration. Assuming that there was no other factor (i.e., new carbon inputs) affecting soil respiration at depth other than soil moisture cycles, this study indicates that there would be no significant change to soil respiration in deep soils under more severe drying-wetting cycles.

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Section: Discussionmentioning

confidence: 49%

“…Previous research on drying-wetting cycles has mainly focused on surface (0-20 cm) soil C [11,[13][14][15]. Fewer studies, however, have looked at subsurface (20-100 cm) [16] and deep (>100 cm) soil C [17].…”

Section: Introductionmentioning

confidence: 99%

Drying-Wetting Cycles: Effect on Deep Soil Carbon

Markewitz

Foroughi

et al. 2018

Soil Systems

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“…Whilst some find significant impacts on the availability of nutrients following drying and rewetting, this is not always the case. Butterly et al (2011a) report that a range of drying and rewetting treatments on two Australian soils had no significant impact on plant P availability, although they note that other parameters including phosphatase activity and microbial community were affected. Fierer et al (2003) explain a lack of response by microbial communities in grassland soils to drying-rewetting events by the fact that they were regularly subjected to such stresses and therefore adapted to them.…”

Section: Introductionmentioning

confidence: 98%

Variations in concentrations of N and P forms in leachates from dried soils rewetted at different rates

2012

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The rate at which dried soils are rewetted can affect the quantities and forms of nutrients in leachates. Both dried and moist replicated (n03) samples of two contrasting grassland soil types (clayey vs brown earth) were irrigated during laboratory experiments with identical total amounts of water, but at different rates, ranging from 0 h, increasing by 30-min increments up to 4 h, and additionally a 24-h rewetting rate. Total P concentrations in leachates from dried samples of both soils generally decreased as rewetting rate increased, ranging from 2,923±589 μg P L −1 (0.5 h rewetting rate) to 731± 46.0 μg P L −1 (24 h, clayey soil) and 1,588±45.1 μg P L −1 (0.5 h) to 439±25.5 μg P L −1 (24 h brown earth). Similar patterns in concentrations occurred for molybdate reactive P (MRP), although concentrations were generally an order of magnitude lower, indicating that the majority of the leached P was probably organic. The moist brown earth leached relatively high concentrations of MRP (maximum 232±10.6 μg P L −1 , 0.5 h), unlike the moist clayey soil (maximum 20.4±10.0 μg P L −1 , 0 h). The total oxidised N concentrations in leachates were less affected by rewetting rate, although longer rewetting rates resulted in decreased concentrations in leachates from the dried samples of both soils. The difference in responses to rewetting rates of the two soils is probably due to differences in the fate of the microbial biomass and adsorption properties in the soils. Results show that soil moisture could be an important factor in regulating nutrient losses and availability, especially under changing patterns of rainfall predicted by future climate change scenarios.

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“…In contrast, Chepkwony et al (2001) and Butterly (2008) observed increased dry matter and P uptake of wheat planted into soils after DRW. Changes in the availability of other nutrients may have contributed to improved plant growth, especially in the second case, since resin-extractable P was not affected by moisture pretreatment (Butterly et al 2011a). Besides the problem of nutrient interactions, the main disadvantages with the bioassay approach are that i) only the effects of preceding DRW cycles can be studied and ii) the transient nutrient pulses may have disappeared by the time the seed or seedling has rooted in the soil and starts to take up nutrients at a significant rate.…”

Section: Introductionmentioning

confidence: 99%

Increased availability of phosphorus after drying and rewetting of a grassland soil: processes and plant use

Bünemann¹,

Keller²,

Hoop³

et al. 2013

Plant Soil

104

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Aims Drying and rewetting (DRW) often increases soil phosphorus (P) availability. Our aims were to elucidate underlying processes and assess potential plant uptake of released P. Methods Using a grassland soil with low available and high microbial P as a model, we studied the contributions of microbial and physicochemical processes to P release by determining DRW effects on i) C:P ratios of nutrient pulses in fresh and sterilized soils, ii) aggregate stability and iii) P forms released upon soil dispersion. Use of the P pulse by maize was examined in a bioassay and a split-root experiment. Results The strong P pulse after DRW was larger than that observed for C. Experiments with sterilized soil pointed to a non-microbial contribution to the pulse for P, but not for C. Aggregate disruption after DRW occurred due to slaking, and this released molybdatereactive and -unreactive P. Maize benefitted from the P pulse only in the bioassay, i.e. when planted after the DRW cycle. Conclusions The majority of C and P released upon DRW originated from the microbial biomass, but for P release, physicochemical processes were also important. In the field, the released P would only be available to drought-resistant plants.

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Changes in water content of two agricultural soils does not alter labile P and C pools

Cited by 11 publications

References 73 publications

Drying-Wetting Cycles: Effect on Deep Soil Carbon

Drying-Wetting Cycles: Effect on Deep Soil Carbon

Variations in concentrations of N and P forms in leachates from dried soils rewetted at different rates

Increased availability of phosphorus after drying and rewetting of a grassland soil: processes and plant use

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