Sample collection procedures for laboratory analysis in the United States soil survey program

Burt, R.; Mays, M. D.

doi:10.1080/00103629609369633

Cited by 23 publications

(44 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Soil pH was measured using a fresh soil to water ratio of 1:2.5 with a Delta pH metre (Mettler‐Toledo Instruments Co.) (Burt, 2004). NH 4 + ‐N, NO 3 − ‐N, dissolved N and DOC in soils were extracted with 0.5 M K 2 SO 4 (Jones & Willett, 2006).…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Increased simulated precipitation frequency promotes greenhouse gas fluxes from the soils of seasonal fallow croplands

Chen

Wen

Zhang

et al. 2023

J of Sust Agri & Env

View full text Add to dashboard Cite

Introduction: Farmlands are key sources of greenhouse gas (GHG) emissions, which are susceptible to changes in precipitation regimes. The soils of seasonal fallow contribute approximately half of annual GHG emissions from farmlands, but the effect of precipitation frequency on soil GHG emissions from seasonal fallow croplands remains virtually unknown. Materials and Methods:We conducted a microcosm study to evaluate the response of nitrous oxide (N 2 O), methane (CH 4 ) and carbon dioxide (CO 2 ) fluxes from typical paddy and upland soils to the changes in watering frequency simulating precipitation scenarios of subtropical regions during seasonal fallow. We also analyzed changes of soil properties and biotic characteristics associated with GHG emissions, including abundances of soil denitrifiers (nirK, nirS, nosZI and nosZII genes), methanotrophs (pmoA gene) and methanogens (mcrA gene) to altered watering frequency.Results: Increased watering frequency led to overall increases in soil N 2 O and CO 2 fluxes compared with low frequency. Compared with low frequency, high watering frequency decreased CH 4 flux from the paddy soil by 3.5 times, while enhanced CH 4 flux from the upland soil by 60%. Furthermore, the increased watering frequency had positive effects on cumulative N 2 O and CO 2 fluxes from the upland soil, whereas no similar trend was observed for the paddy soil. Hierarchical partitioning analyses showed that N 2 O fluxes from the paddy soil were mostly related to nitrogen availability, and mcrA gene abundance had more than 90% of relative independent effects on CH 4 and CO 2 fluxes from the paddy soil. For the upland soil, nosZ (60.34%), pmoA (53.18%) and nir (47.07%) gene abundances were important predictors of N 2 O, CH 4 and CO 2 fluxes, respectively. Conclusion:Our results demonstrate that increased watering frequency facilitates GHG emissions by changing soil properties and functional gene abundances. These findings provide new insights into GHG fluxes from seasonal fallow croplands in response to altered precipitation patterns.

show abstract

Section: Methodsmentioning

confidence: 99%

“…Soil pH was measured using a fresh soil to water ratio of 1:2.5 with a Delta pH metre (Mettler-Toledo Instruments Co.) (Burt, 2004). measurement by the time intervals and then summarizing these values (Liu et al, 2020).…”

Section: Soil Characteristic Analyses and Ghg Flux Measurementsmentioning

confidence: 99%

Increased simulated precipitation frequency promotes greenhouse gas fluxes from the soils of seasonal fallow croplands

Chen

Wen

Zhang

et al. 2023

J of Sust Agri & Env

View full text Add to dashboard Cite

show abstract

“…We collected soil samples in November 2016 (hereafter, season 1) and June 2018 (hereafter, season 4) from all study plots, including two reference samples of fill and topsoil that were not used in the study. Soil samples were sent to the Cornell Nutrient Analysis Laboratory (Ithaca, NY) for analysis of micro‐ and macronutrient concentrations, pH, organic matter (LOI), and heavy metal concentrations using a modified Mehlich‐I extraction technique (Burt, 2004). This analysis technique measures a variety of soil nutrients and abiotic characteristics that have been used in prior studies to characterize urban soils (Johnson et al, 2015; Pavao‐Zuckerman, 2008; Pouyat et al, 2010).…”

Section: Methodsmentioning

confidence: 99%

The effects of local filtering processes on the structure and functioning of native plant communities in experimental urban habitats

Borowy

Swan

2022

Ecology and Evolution

View full text Add to dashboard Cite

Despite a growing literature‐base devoted to document biodiversity patterns in cities, little is known about the processes that influence these patterns, and whether they are consistent over time. In particular, numerous studies have identified the capacity of cities to host a rich diversity of plant species. This trend, however, is driven primarily by introduced species, which comprise a large proportion of the urban species pool relative to natives. Using an experimental common garden study, we assessed the relative influence of local assembly processes (i.e., soil environmental filtering and competition from spontaneous urban species) on the taxonomic and functional diversity of native plant communities sampled over four seasons in 2016–2018. Taxonomic and functional diversity exhibited different responses to local processes, supporting the general conclusion that species‐ and trait‐based measures of biodiversity offer distinct insights into community assembly dynamics. Additionally, we found that neither soil nor competition from spontaneous urban species influenced taxonomic or functional composition of native species. Functional composition, however, did shift strongly over time and was driven by community‐weighted mean differences in both measured traits (maximum height, Hmax; specific leaf area, SLA; leaf chlorophyll a fluorescence, Chl a ) and the relative proportions of different functional groups (legumes, annual and biennial‐perennial species, C4 grasses, and forbs). By contrast, taxonomic composition only diverged between early and late seasons. Overall, our results indicate that native species are not only capable of establishing and persisting in vacant urban habitats, they can functionally respond to local filtering pressures over time. This suggests that regional dispersal limitation may be a primary factor limiting native species in urban environments. Thus, future regreening and management plans should focus on enhancing the dispersal potential of native plant species in urban environments, in order to achieve set goals for increasing native species diversity and associated ecosystem services in cities.

show abstract

“…HCO -3 and CO = 3 contents were measured by acid-base titration and SO = 4 content was calculated by difference. Organic matter content in soil was estimated by dichromate oxidation method (Burt, 2004). The data are presented in Table 2.…”

Section: Soil and Plant Analysismentioning

confidence: 99%

The Potential Effect of Amino Acids Solution on the Growth Parameters and Productivity of Faba Bean Under Saline Water Conditions

Abdeen

Hefni

2022

Egypt.J. Soil Sci.

View full text Add to dashboard Cite

HIS STUDY was conducted to examine the effect of amino acids solution (AAS) on faba bean growth and yield under different levels of saline water. AAS produced from shrimp shells wastes (deproteinization process). For achieve this purpose, AAS added at rates 0 (distilled water),1000,1500 and 2000 mg/L under 50 mM NaCl, 75 mM NaCl and 100 mM NaCl as compared to control (tap water). The plants sprayed by AAS at 25, 40, 55 and 70 days of sowing. The results obtained that there is a negative correlation between soil salinity and soil organic matter (r = -0.814). Also, irrigated faba bean plants with saline water gave a significance reduction in growth parameter (plant height, number of seeds per plant, and number of pods per plant) and productivity. Furthermore, there is a negative correlation between soil salinity and protein content (r = -0.645) and significance decrease in N, P and K concentrations. While foliar application of AAS recorded a significant increase in growth parameters and productivity. The highest percent increase of grain and straw yield were 71.94% and 49.05% at 50 mM NaCl; 102.36% and 41.8% at 75 mM NaCl, and 137.40% and 53.70% at100 mM NaCl, respectively under 2000 mg/L AAS. Foliar application of amino acids solution produced from shrimp waste considered a new technique for improving faba bean growth and productivity under salinity conditions. Furthermore, the application of amino acids solution at rates 1500 mg/L and 2000 mg/L was appeared a significant increase in faba bean productivity and water use efficiency.

show abstract

Sample collection procedures for laboratory analysis in the United States soil survey program

Cited by 23 publications

References 0 publications

Increased simulated precipitation frequency promotes greenhouse gas fluxes from the soils of seasonal fallow croplands

Increased simulated precipitation frequency promotes greenhouse gas fluxes from the soils of seasonal fallow croplands

The effects of local filtering processes on the structure and functioning of native plant communities in experimental urban habitats

The Potential Effect of Amino Acids Solution on the Growth Parameters and Productivity of Faba Bean Under Saline Water Conditions

Contact Info

Product

Resources

About