Seasonal variations in phosphorus fractions in semiarid sandy soils under different vegetation types

Zhao, Qiong; Zeng, De‐Hui; Fan, Zhiping; Yu, Zhan-Yuan; Hu, Ya-Lin; Zhang, Jianwei

doi:10.1016/j.foreco.2009.06.047

Cited by 46 publications

(29 citation statements)

References 38 publications

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“…This result is confirmed by other studies that have found a significantly higher SOM and microbial biomass carbon in winter compared with summer [10,11]. Although the decomposition rate is slower during this period, the enzyme and microbial activities in early fall, and the plant carbon inputs and litter chemistry in winter may have increased the soil's carbon concentration [26][27][28].…”

Section: Sampling Season Effectssupporting

confidence: 87%

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Seasonal Changes of Soil Quality Indicators in Selected Arid Cropping Systems

et al. 2018

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Abstract:Improving the soil quality in arid agro-ecosystems requires a greater understanding of how the time-of-sampling and management affect the soil measurements. We evaluated the selected soil quality indicators on samples collected at a 0-0.15 m depth, and at various sampling dates of the year, corresponding to the fall of 2015, winter of 2015/2016, spring of 2016, and the summer of 2016. The three crop management systems sampled included alfalfa (Medicago sativa), upland cotton (Gossypium hirsutum), and pecan (Carya illinoinensis). The soil properties measured included the wet aggregate stability (WAS), mean weight diameter of dry aggregates (MWD), dry aggregates greater than 2 mm (AGG >2 mm), dry aggregates less than 0.25 mm (AGG <0.25 mm), available water capacity (AWC), soil organic matter (SOM), permanganate oxidizable carbon (POXC), soil bulk density (BD), soil electrical conductivity (EC), pH, nitrate-nitrogen (NO3-N), extractable potassium (K), extractable phosphorus (P), calcium (Ca), magnesium (Mg), sodium adsorption ratio (SAR), and micronutrients (zinc, iron, copper, and manganese). Out of the 21 soil measurements, 15 varied significantly with the time-of-sampling within a year, although there were no consistent trends in variability. However, only a few measurements differed significantly with the crop management practices tested. Wet aggregate stability, MWD, AWC, and BD were significantly higher in the summer, while POXC and SOM were significantly higher in the fall and winter, respectively. Soil quality indicators such as NO3-N, K, and P decreased significantly during the spring. This study shows that the seasonal variability of the soil measurements can be significant in the arid agro-ecosystems, with the magnitude of variation depending on the measurement type. The soil managers in the region need to account for this variability, in order to be able to assess the changes in the soil quality. Also, because of the variability that can occur across the different sampling dates within a year, it is advisable to sample during the same period every year, for a consistent interpretation of the directional changes of the soil quality indicators.

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Section: Sampling Season Effectssupporting

confidence: 87%

“…These temporal changes may be due to a combination of increased temperature and microbial-plant root activities [14,26]. Mycorrhizae fungi and their hyphae have a symbiotic relationship with plant roots that could serve a vital role in the aggregation process.…”

Section: Sampling Season Effectsmentioning

confidence: 99%

Seasonal Changes of Soil Quality Indicators in Selected Arid Cropping Systems

et al. 2018

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“…On the contrary, Zhao et al [25] found greater mineral P in the summer and attributed it to the combined effect of the high temperature and moisture which promote the biological transformations of soil P and lead to increased availability of inorganic P in the soil. However, other researchers have observed greater P accumulation during autumn than in spring and summer [24,26] and ascribed it to the greater plant uptake and increased biological activity in the soil.…”

Section: Seasonal Dynamics In Soil Supply and Bioavailability Of N Pmentioning

confidence: 96%

Seasonal Dynamics of N, P, and K in an Organic and Inorganic Fertilized Willow Biomass System

Quaye

Volk

Schoenau

2015

Applied and Environmental Soil Science

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The seasonal variations in soil nutrient supply and bioavailability were assessed in a willow biomass crop (Salix miyabeana, SX64) treated with 150 and 200 kg available N ha−1of commercial fertilizer (CF), biosolid compost (BC), dairy manure (DM), and control (CT0) at Delhi, NY. Plant root simulator probes were used to measure nutrient supply (inside) and bioavailability (outside) of root exclusion cylinders. Measurements were made in September 2008 and May, August, and October of 2009. Soil moisture content (θd)and foliar nutrient concentrations were also determined. The BC treatments increased soil P supply more than CF and CT0. The supply ofNH4+and K in the soil increased in August but their bioavailability increased in May and October. SoilNO3-and P supply and bioavailability were both high in May. Foliar N and K concentrations were significantly high in May and low in August which could be due to dilution effect caused by increased soil moisture foliar dry weight. Foliar P concentrations increased in September and October. The observed higher soilNO3-mineralization and plant uptake in May suggest that in high soilNO3-conditions willow biomass crops can level and minimize leaching out of the root zone into groundwater.

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“…1). The seasonal changes in the concentration of different P forms in arable soils indicate that the mineralization of labile organic P occurs (Magid and Nielsen 1992;Zhao et al 2009). Indeed, in this study, the ratio P O /P T was 15 % lower in August than in April, which indicated that the process of the mineralization of P O in plant residues occurred between April and August, which resulted in a higher P I and P T concentration in August than in April in contrast to the phosphatase activity, which had less activity in August than in April.…”

Section: Inside-population Variability Of P Forms and Related Enzymesmentioning

confidence: 99%

“…However, soil properties often reveal high temporal, e.g., seasonal variability and variability between years (Magid and Nielsen 1992;Štípek et al 2004;Zhao et al 2009). Taking into account the high temporal soil variability, it was hypothesized that soil properties that were studied in the same area differed in spatial distribution over time, which may result in making a proper recommendation for management practices based on the differences.…”

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confidence: 99%

Spatio-temporal variations of soil properties in a plot scale: a case study of soil phosphorus forms and related enzymes

et al. 2015

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Purpose Spatio-temporal variability in soil properties has long been observed on uniformly managed fields. Understanding the spatial characteristics of soil properties would be helpful in recognizing their relationship and the development of site-specific management techniques. The objective of this study was to determine the spatio-temporal variation of P forms and related enzymes and their relationship with some physico-chemical properties in a plot scale. Materials and methods A grid soil sampling (10×10 m) was used to measure the spatial variation of soil properties across a 0.4-ha field. Soil samples were collected at 50 points from the upper 20 cm of luvisols in April and August 2007. The total (P T ), available (P A ), inorganic (P I ), organic (P O ) phosphorus concentration, and acid (P AC ) and alkaline (P AL ) phosphatase activity were analyzed. Additionally, total organic carbon (TOC), soil pH KCl , and clay content were determined. Data were evaluated using classical statistical and geostatistical methods. Results and discussion Both enzyme activities were significantly higher in April than in August, while the P T and P I concentration were significantly lower. The concentrations of P O and P A did not significantly differ between sampling dates. The spherical or mixed (spherical/linear) models with the nugget effect were fitted to the calculated semivariograms. The P A and TOC concentrations on both sampling dates as well as P AC activity in April were situated in the strong variability class, the P I concentration in April revealed a weak spatial variability and the other properties were in the moderate variability class. The clay content revealed a pure nugget effect. The range of the influence that was calculated for the properties ranged from 16.5 to 50.0 m. Kriged maps showed that temporal variability was observed in the spatial patterns of the P I and TOC concentrations and P AC activity. Conclusions Results from this study can help us to understand and predict the contribution of internal factors (i.e., soil type) in the total variability of soil properties that can interfere with the influence of soil management practices. The spatiotemporal variability showed that the studied area was temporally unstable and the implication of these findings is that more frequent sampling, at least several times throughout the growing season, must be included in the sampling strategy in order to better understand whether P forms and related enzymes show any permanent spatial patterns in soil all of the time or whether they are more randomized.

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Seasonal variations in phosphorus fractions in semiarid sandy soils under different vegetation types

Cited by 46 publications

References 38 publications

Seasonal Changes of Soil Quality Indicators in Selected Arid Cropping Systems

Seasonal Changes of Soil Quality Indicators in Selected Arid Cropping Systems

Seasonal Dynamics of N, P, and K in an Organic and Inorganic Fertilized Willow Biomass System

Spatio-temporal variations of soil properties in a plot scale: a case study of soil phosphorus forms and related enzymes

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