Soil Microbial Responses to Temporal Variations of Moisture and Temperature in a Chihuahuan Desert Grassland

Bell, Colin W.; McIntyre, Nancy E.; Cox, Stephen B.; Tissue, David T.; Zak, John C.

doi:10.1007/s00248-007-9333-z

Cited by 160 publications

(107 citation statements)

References 48 publications

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“…Soil moisture stimulates plant productivity and microbial driven processes (Vargas et al 2012). For example, timing and magnitude of rain events alter nitrogen mineralization, transformations of organic matter, and carbon loss from dryland soils (Austin et al 2004, Belnap et al 2005, Bell et al 2008, Munson et al 2010, Vargas et al 2012. Therefore, small precipitation events may differentially influence plant and microbial activities by separating the timing of nutrient transformation and utilization (Austin et al 2004, Huxman et al 2004, Sponseller 2007.…”

Section: Introductionmentioning

confidence: 99%

Soil enzyme responses to varying rainfall regimes in Chihuahuan Desert soils

et al. 2015

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Abstract. Extracellular enzyme activities (EEAs) are indicators of both soil microbial activity and nutrient availability for plants. However, it is unclear how EEAs change over the growing season in desert grasslands. We examined whether EEAs changed in response to the size and frequency of rain events during the summer monsoon in the northern Chihuahuan Desert, and if the response varied between plant and interspace associated soils. Potential EEAs were measured within a rainfall manipulation experiment at the Sevilleta National Wildlife Refuge in central New Mexico, USA. Rainfall treatments included either three 10-mm events or one 30-mm rain event per month throughout the three month summer monsoon (July-September). EEAs were measured immediately before and within hours after experimental rain events under plants and in unvegetated interspaces. Throughout the season hydrolase activities were higher under vegetation than in interspace soils. Potential activities of hydrolytic enzymes were similar for the two rainfall regimes. Activities increased following early season rain, showed little response to midseason rain, and decreased following late-season rain. Although enzyme activities did not differ between rainfall treatments, ratios between enzymes varied, indicating different nutrient limitations imposed by rain event size and frequency. Larger nitrogen and phosphorus limitations occurred in interspace soils that experienced large, frequent rain events. Many factors, including location relative to plants, seasonality, and rainfall size and frequency, influenced enzyme activities and nutrient availability in these Chihuahuan Desert soils throughout the monsoon season.

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Section: Introductionmentioning

confidence: 99%

Soil enzyme responses to varying rainfall regimes in Chihuahuan Desert soils

et al. 2015

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“…The degradation in natural soil is done by microbes in the system and the total bacteria of natural soil were stabilized at 1.5 × 10 5 CFU/g. In natural soil, the degradation was relatively lower than that in soil solution, considering that the soil microbes were more active in the moisture or water systems [17]. The DT 50 of the pesticide in natural soil was 82.5 days obtained by SOF model (75.9 days by FOD model), while the DT 90 was 274.1 days by SOF model (283.9 days by FOD model), respectively ( Table 1).…”

Section: Degradation In Soilmentioning

confidence: 97%

Degradation of furan tebufenozide in laboratory and field trials

Guo

Chen

et al. 2010

Sci. China Chem.

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Furan tebufenozide is a newly developed insect growth regulator and has been applied as a pesticide in agriculture in China. Its degradation under both laboratory and field conditions was investigated, and the degradation kinetics was fitted by simple first order kinetics (SFO) model and first order double exponential (FOD) model. Laboratory studies were conducted with or without light in five simulated media (sterilized deionized water, river water, soil solution, sterilized soil and natural soil). No dissipations of furan tebufenozide were observed in sterilized aqueous and soil media under light prevented conditions, whereas degradation occurred under all the other conditions in the laboratory. Derived from SFO and FOD models, DT 50 in the dark and light laboratory conditions was in the range of 39.7-82.5 and 1.1-8.0 days, respectively. These results indicated that microbes and light were the main factors for the degradation of the pesticide in the laboratory. During field trials, derived from the SFO model, DT 50 and DT 90 were 30.3 and 100.5 days, while derived from the FOD model, DT 50 and DT 90 were 28.9 and 274.9 days, respectively. Compared with laboratory experiments, field trials were influenced by multiple factors. Therefore, the SFO model could not fit experimental data as well as the FOD model did in field trials.

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“…Bell et al, 2008;Crow et al, 2009) during studies of soil biogeochemistry to 8 estimate soil respiration and denitrification rates. 9…”

Section: Model Development 24mentioning

confidence: 99%

“…Soil moisture has a direct 14 influence on the processes mediated by the soil biota (pedofauna, bacteria, fungi, etc.) because optimal 15 decomposition rates are achieved only in a narrow saturation range (Bell et al, 2008; Ju et al, 2006; 16 Porporato et al, 2003;Van Gestel et al, 1992). Owing to the strong dependence of ecological processes on 17 soil moisture, linear and non-linear interactions and feedbacks exist between hydrological processes and soil 18 ecosystem functioning (Curiel Yuste et al, 2007;Misson et al, 2005;Scott-Denton et al, 2006; Van Gestel 19 et al, 1993) A second crucial external forcing factor for SOM and soil productivity -related to vegetation rather than to 5 climate -is the amount and quality of the litter input (Dent et al, 2006; Elliott et al, 1993; Manzoni et al, 6 2008;Paul et al, 2001;Sørensen, 1974).…”

mentioning

confidence: 99%

Analysis of carbon and nitrogen dynamics in riparian soils: Model development

Brovelli¹,

Batlle-Aguilar²,

Barry³

2012

Science of The Total Environment

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1The quality of riparian soils and their ability to buffer contaminant releases to aquifers and streams are 2 connected intimately to moisture content and nutrient dynamics, in particular of carbon (C) and nitrogen (N). 3A multi-compartment model -named the Riparian Soil Model (RSM) -was developed to help investigate 4 the influence and importance of environmental parameters, climatic factors and management practices on 5 soil ecosystem functioning in riparian areas. The model improves existing tools, in particular regarding its 6 capability to simulate a wide range of temporal scales, from days to centuries, along with its ability to predict 7 the concentration and vertical distribution of dissolved organic matter (DOM). It was found that DOM 8 concentration controls the amount of soil organic matter (SOM) stored in the soil as well as the respiration 9 rate. The moisture content was computed using a detailed water budget approach, assuming that within each 10 time step all the water above field capacity drains to the layer underneath, until it becomes fully saturated. A 11 mass balance approach was also used for nutrient transport, whereas the biogeochemical reaction network 12 was developed as an extension of an existing C and N turnover model. Temperature changes across the soil 13 profile were simulated analytically, assuming periodic temperature changes in the topsoil. Sustainable management of riparian soils is of primary importance to preserve natural ecosystem 3 functioning. Riparian zones are sources of ecosystem functions and services including biodiversity hotspots, 4 water quality enhancement, and recreation sites (Brinson et al., 1981;Naiman and Decamps, 1997). 5Throughout the world, the ecological condition of natural riparian systems has declined due to a number of 6 factors, including streamflow regulation, floodplain development, channelization, and the spread of non-7 native species (Naiman and Decamps, 1997;Naiman et al., 2005). Consequently, restoration of riparian areas 8 has become a global management priority (Hughes et al., 2005;Hughes and Rood, 2003; Webb and Erskine, 9 2003). 10 Soil ecosystem functioning is connected intimately to soil organic matter (SOM) turnover, a set of complex 11 and intertwined biological processes that recycle biotic residues (such as plant litter, dead organisms, etc.) to 12 inorganic molecules. Environmental and climatic factors affect decomposition rates, the biological activity of 13 the soil and ultimately SOM cycling (Laio et al., 2001;Porporato et al., 2003). Soil moisture has a direct 14 influence on the processes mediated by the soil biota (pedofauna, bacteria, fungi, etc.) because optimal 15 decomposition rates are achieved only in a narrow saturation range (Bell et al., 2008; Ju et al., 2006; 16 Porporato et al., 2003;Van Gestel et al., 1992). Owing to the strong dependence of ecological processes on 17 soil moisture, linear and non-linear interactions and feedbacks exist between hydrological processes and soil 18 ecosystem functionin...

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Soil Microbial Responses to Temporal Variations of Moisture and Temperature in a Chihuahuan Desert Grassland

Cited by 160 publications

References 48 publications

Soil enzyme responses to varying rainfall regimes in Chihuahuan Desert soils

Soil enzyme responses to varying rainfall regimes in Chihuahuan Desert soils

Degradation of furan tebufenozide in laboratory and field trials

Analysis of carbon and nitrogen dynamics in riparian soils: Model development

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