The proportional mineralisation of microbial biomass and organic matter caused by air-drying and rewetting of a grassland soil

Wu, Jinshui; Brookes, Philip C.

doi:10.1016/j.soilbio.2004.07.043

Cited by 232 publications

(114 citation statements)

References 36 publications

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“…The respiration flush often decreases with increasing cycles of DW alternation (Fierer et al, 2003;Wu and Brookes, 2005). These findings were supported by our results, that the increases of SIR were largest at 1 c in different copper-stressed treatments, and the fluctuations decreased with continuous DW alternations.…”

Section: Changes In the Magnitude Of Sir Decreases With Repeated Dry-supporting

confidence: 88%

“…However, the Gammaproteobacteria were not resistant to the DW disturbance, but were resilient. The recovery of Gammaproteobacteria might be ascribed to the decrease in released substrates from cell lysis with increasing DW alternations (Wu and Brookes, 2005;Shi and Marschner, 2014). As for the red soil, Acidobacteria and Ktedonobacteria were less resistant than Planctomycetia and WPS-2 to the DW disturbance.…”

Section: Bacterial Communities Respond Sensitively To Dw Disturbancementioning

confidence: 97%

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Copper pollution decreases the resistance of soil microbial community to subsequent dry–rewetting disturbance

Wang

et al. 2016

Journal of Environmental Sciences

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Dry-rewetting (DW) disturbance frequently occurs in soils due to rainfall and irrigation, and the frequency of DW cycles might exert significant influences on soil microbial communities and their mediated functions. However, how microorganisms respond to DW alternations in soils with a history of heavy metal pollution remains largely unknown.Here, soil laboratory microcosms were constructed to explore the impacts of ten DW cycles on the soil microbial communities in two contrasting soils (fluvo-aquic soil and red soil) under three copper concentrations (zero, medium and high). Results showed that the fluctuations of substrate induced respiration (SIR) decreased with repeated cycles of DW alternation. Furthermore, the resistance values of substrate induced respiration (RS-SIR) were highest in non-copper-stressed (zero) soils. Structural equation model (SEM) analysis ascertained that the shifts of bacterial communities determined the changes of RS-SIR in both soils. The rate of bacterial community variance was significantly lower in noncopper-stressed soil compared to the other two copper-stressed (medium and high) soils, which might lead to the higher RS-SIR in the fluvo-aquic soil. As for the red soil, the substantial increase of the dominant group WPS-2 after DW disturbance might result in the low RS-SIR in the high copper-stressed soil. Moreover, in both soils, the bacterial diversity was highest in non-copper-stressed soils. Our results revealed that initial copper stress could decrease the resistance of soil microbial community structure and function to subsequent DW disturbance.

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Section: Changes In the Magnitude Of Sir Decreases With Repeated Dry-supporting

confidence: 88%

Section: Bacterial Communities Respond Sensitively To Dw Disturbancementioning

confidence: 97%

Copper pollution decreases the resistance of soil microbial community to subsequent dry–rewetting disturbance

Wang

et al. 2016

Journal of Environmental Sciences

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“…Rhizosphere respiration is dependent on substrate input from recent photosynthesis (Högberg et al, 2001;Kuzyakov and Cheng, 2001), which should be less affected by shortterm soil moisture dynamics. Microbial respiration, however, is determined by available biomass or non-biomass sources of soil organic carbon, which can increase after rewetting due to various mechanisms (Wu and Brookes, 2005;Xiang et al, 2008;Borken and Matzner, 2009;Navarro-Garcia et al, 2012). In this study, the severe dryingewetting reduced microbial and rhizosphere respiration to a similar extent in the sunflower treatment, and the moderate dryingewetting did not affect either component in the soybean treatment.…”

Section: Do Dryingewetting Cycles Impact Rhizosphere Respiration Andmentioning

confidence: 49%

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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“…This resulted in the release of cell content of which P is an important component. Second, soil aggregate disruption and cracking of organic colloids releases increase the extractability of the non-biomass soil organic matter and exposes new soil surfaces for microbial attack (Wu and Brookes 2005). It also allows these recalcitrant nutrients to be transformed into a more labile nutrient pool contributing to the flush of nutrient mineralization and solubilization (Gordon et al 2008).…”

Section: Discussionmentioning

confidence: 99%

Effects of air-drying and freezing on phosphorus fractions in soils with different organic matter contents

Xu¹,

Sun²,

Xu³

et al. 2011

PLANT SOIL ENVIRON

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Little is known about the effects of air-drying and freezing on the transformation of phosphorus (P) fractions in soils. It is important that the way in which soils respond to such perturbations is better understood as there are implications for both P availability and loss to surface waters from soils. In this study, the effects of air-drying and freezing were investigated using two soils, one being a forest soil (FS) high in organic matter and the other being a sterile soil (SS) low in organic matter. Soil P was fractionated using a modified Hedley fractionation method to examine the changes of phosphorus fractions induced by air-drying and freezing. Generally, there were no significant differences of total phosphorus among the three treatments (CV% < 10%). Compared with field moist soils, freezing the soil evoked few changes on phosphorus fractions except that the resin-P increased in FS soil. On the contrary, air-drying significantly changed the distribution of phosphors fractions for both soils: increased the labile-P (especially resin-P) and organic-P (NaHCO 3 -Po, NaOH-Po and Con.HCl-Po) at the expense of NaOH-Pi and occlude-P (Dil.HCl-P and Con.HCl-Pi). Resin-P significantly increased by 31% for SS soil and by 121% for FS soil upon air-drying. The effect of air-drying seemed to be more pronounced in the FS soil with high organic matter content. These results indicated that drying seem to drive the P transformation form occlude-P to labile-P and organic-P and accelerated the weathering of stable P pool. This potentially could be significant for soil P supply to plants and P losses from soils to surface waters under changing patterns of rainfall and temperature as predicted by some climate change scenarios.

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The proportional mineralisation of microbial biomass and organic matter caused by air-drying and rewetting of a grassland soil

Cited by 232 publications

References 36 publications

Copper pollution decreases the resistance of soil microbial community to subsequent dry–rewetting disturbance

Copper pollution decreases the resistance of soil microbial community to subsequent dry–rewetting disturbance

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

Effects of air-drying and freezing on phosphorus fractions in soils with different organic matter contents

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