Influence of dry–wet cycles on the interrelationship between aggregate, particulate organic matter, and microbial community dynamics

Denef, Karolien; Six, Johan; Bossuyt, Heleen; Frey, Serita D.; Elliott, E. T.; Merckx, Roel; Paustian, Keith

doi:10.1016/s0038-0717(01)00076-1

Cited by 604 publications

(336 citation statements)

References 36 publications

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“…1). The fluctuation from wet to dry soil conditions due to precipitation can generally increase C and N mineralization rates for a few days (Franzluebbers et al 2000) by increasing the mineralization of soil organic matter (SOM) (Denef et al 2001a(Denef et al , 2001b and affecting the soil's physical properties, such as aggregation (Mikha et al 2005). When dry soil is wetted, the soil matric potential increases.…”

Section: Discussion N 2 O Co 2 and Nh 3 Emissions Affected By N Depomentioning

confidence: 99%

Combined effects of nitrogen deposition and biochar application on emissions of N₂O, CO₂and NH₃from agricultural and forest soils

Sun

Chen

et al. 2014

Soil Science and Plant Nutrition

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Both nitrogen (N) deposition and biochar can affect the emissions of nitrous oxide (N 2 O), carbon dioxide (CO 2 ) and ammonia (NH 3 ) from different soils. Here, we have established a simulated wet N deposition experiment to investigate the effects of N deposition and biochar addition on N 2 O and CO 2 emissions and NH 3 volatilization from agricultural and forest soils. Repacked soil columns were subjected to six N deposition events over a 1-year period. N was applied at rates of 0 (N0), 60 (N60), and 120 (N120) kg Nh a −1 yr −1 without or with biochar (0 and 30 t ha). For agricultural soil, adding N increased cumulative N 2 O emissions by 29.8% and 99.1% (p < 0.05) from the N60 and N120 treatments, respectively as compared to without N treatments, and N120 emitted 53.4% more (p < 0.05) N 2 O than the N60 treatment; NH 3 volatilization increased by 33.6% and 91.9% (p < 0.05) from the N60 and N120 treatments, respectively, as compared to without N treatments, and N120 emitted 43.6% more (p < 0.05) NH 3 than N60; cumulative CO 2 emissions were not influenced by N addition. For forest soil, adding N significantly increased cumulative N 2 O emissions by 141.2% (p < 0.05) and 323.0% (p < 0.05) from N60 and N120 treatments, respectively, as compared to without N treatments, and N120 emitted 75.4% more (p < 0.05) N 2 O than N60; NH 3 volatilization increased by 39.0% (p < 0.05) and 56.1% (p < 0.05) from the N60 and N120 treatments, respectively, as compared to without N treatments, and there was no obvious difference between N120 and N60 treatments; cumulative CO 2 emissions were not influenced by N addition. Biochar amendment significantly (p < 0.05) decreased cumulative N 2 O emissions by 20.2% and 25.5% from agricultural and forest soils, respectively, and increased CO 2 emissions slightly by 7.2% and NH 3 volatilization obviously by 21.0% in the agricultural soil, while significantly decreasing CO 2 emissions by 31.5% and NH 3 volatilization by 22.5% in the forest soil. These results suggest that N deposition would strengthen N 2 O and NH 3 emissions and have no effect on CO 2 emissions in both soils, and treatments receiving the higher N rate at N120 emitted obviously more N 2 O and NH 3 than the lower rate at N60. Under the simulated N deposition circumstances, biochar incorporation suppressed N 2 O emissions in both soils, and produced contrasting effects on CO 2 and NH 3 emissions, being enhanced in the agricultural soil while suppressed in the forest soil.

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Section: Discussion N 2 O Co 2 and Nh 3 Emissions Affected By N Depomentioning

confidence: 99%

Combined effects of nitrogen deposition and biochar application on emissions of N₂O, CO₂and NH₃from agricultural and forest soils

Sun

Chen

et al. 2014

Soil Science and Plant Nutrition

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“…Soil aggregation is an important factor for plant growth and directly affects water infiltration, the structure of the microbial community, soil biodiversity, soil biomass dynamics, nutrient adsorption and desorption, oxygen availability to the roots, and soil erosion (Denef et al, 2001;Franzluebbers, 2002;Six et al, 2004;Madari et al, 2005;Souza et al, 2009;. Six et al (2004) added that all of these processes greatly affect soil organic matter (SOM) dynamics and nutrient cycling.…”

Section: Introductionmentioning

confidence: 99%

Soil Aggregation, Organic Carbon Concentration, and Soil Bulk Density As Affected by Cover Crop Species in a No-Tillage System

Nascente

Crusciol

2015

Rev. Bras. Ciênc. Solo

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Soil aggregation and the distribution of total organic carbon (toc) may be affected by soil tillage and cover crops. the objective of this study was to determine the effects of crop rotation with cover crops on soil aggregation, toc concentration in the soil aggregate fractions, and soil bulk density under a no-tillage system (NtS) and conventional tillage system (ctS, one plowing and two disking). this was a three-year study with cover crop/rice/cover crop/rice rotations in the brazilian cerrado. A randomized block experimental design with six treatments and three replications was used. the cover crops (treatments) were: fallow, Panicum maximum, Brachiaria ruziziensis, Brachiaria brizantha, and millet (Pennisetum glaucum). An additional treatment, fallow plus ctS, was included as a control. Soil samples were collected at the depths of 0.00-0.05 m, 0.05-0.10 m, and 0.10-0.20 m after the second rice harvest. the treatments under the NtS led to greater stability in the soil aggregates (ranging from 86.33 to 95.37 %) than fallow plus ctS (ranging from 74.62 to 85.94 %). fallow plus ctS showed the highest number of aggregates smaller than 2 mm. the cover crops affected soil bulk density differently, and the millet treatment in the NtS had the lowest values. the cover crops without incorporation provided the greatest accumulation of toc in the soil surface layers. the toc concentration was positively correlated with the aggregate stability index in all layers and negatively correlated with bulk density in the 0.00-0.10 m layer.

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“…Surface soils often undergo gradual drying by evapotranspiration followed by rapid wetting as a result of precipitation or irrigation. These dryingewetting cycles can influence soil aggregation (Denef et al, 2001;Cosentino et al, 2006), microbial activity and community structure (Gordon et al, 2008;Tiemann and Billings, 2011;Evans and Wallenstein, 2012), and C and N mineralization (Birch, 1958;Fierer and Schimel, 2003;Borken and Matzner, 2009). In the coming decades, many soils will likely be subjected to more frequent and intense dryingewetting cycles (Huntington, 2006), which can impact SOM decomposition and its feedback to climate change.…”

Section: Introductionmentioning

confidence: 99%

Impacts of drying–wetting cycles on rhizosphere respiration and soil organic matter decomposition

Zhu

Cheng

2013

Soil Biology and Biochemistry

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a b s t r a c tDryingewetting cycles influence both soil organic matter (SOM) decomposition and rhizosphere processes. Rhizosphere processes also affect SOM decomposition through rhizosphere priming. However, little is known about how dryingewetting cycles regulate SOM decomposition with rhizosphere priming, because most previous studies incubated root-free soils and omitted the rhizosphere effect. To investigate the effect of dryingewetting cycles on SOM decomposition in the presence of plants, we grew sunflower (Helianthus annuus) and soybean (Glycine max) in a sandy loam soil under the treatments of either constant moisture or 12 dryingewetting cycles, and used a continuous 13 C-labeling method to partition soil respiration into rhizosphere respiration and SOM decomposition. We found that compared to the constantly-moist treatment, the severe dryingewetting cycles in soils planted with sunflower significantly reduced shoot biomass (32%), root biomass (52%), rhizosphere respiration (29%), and SOM decomposition (22%), while the moderate dryingewetting cycles in soils planted with soybean did not significantly affect these variables. Moreover, SOM decomposition rates in the planted treatment subjected to constantly-moist or dryingewetting conditions were significantly higher compared with the constantly-moist unplanted treatment, indicating a positive rhizosphere priming effect under both soil moisture regimes. However, dryingewetting reduced the rhizosphere priming of sunflower (69% versus 33%) likely due to lower plant biomass and rhizodeposition, but produced similar rhizosphere priming of soybean (82% versus 85%). Overall, dryingewetting cycles significantly modulated rhizosphere respiration and SOM decomposition, with the magnitude depending on soil drying intensity and plant growth performance.Published by Elsevier Ltd.

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Influence of dry–wet cycles on the interrelationship between aggregate, particulate organic matter, and microbial community dynamics

Cited by 604 publications

References 36 publications

Combined effects of nitrogen deposition and biochar application on emissions of N₂O, CO₂and NH₃from agricultural and forest soils

Combined effects of nitrogen deposition and biochar application on emissions of N₂O, CO₂and NH₃from agricultural and forest soils

Soil Aggregation, Organic Carbon Concentration, and Soil Bulk Density As Affected by Cover Crop Species in a No-Tillage System

Impacts of drying–wetting cycles on rhizosphere respiration and soil organic matter decomposition

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Influence of dry–wet cycles on the interrelationship between aggregate, particulate organic matter, and microbial community dynamics

Cited by 604 publications

References 36 publications

Combined effects of nitrogen deposition and biochar application on emissions of N2O, CO2and NH3from agricultural and forest soils

Combined effects of nitrogen deposition and biochar application on emissions of N2O, CO2and NH3from agricultural and forest soils

Soil Aggregation, Organic Carbon Concentration, and Soil Bulk Density As Affected by Cover Crop Species in a No-Tillage System

Impacts of drying–wetting cycles on rhizosphere respiration and soil organic matter decomposition

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Product

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Combined effects of nitrogen deposition and biochar application on emissions of N₂O, CO₂and NH₃from agricultural and forest soils

Combined effects of nitrogen deposition and biochar application on emissions of N₂O, CO₂and NH₃from agricultural and forest soils