Winter soil temperature and its effect on soil nitrate Status: A Support Vector Regression-based approach on the projected impacts

Sahoo, Madhumita

doi:10.1016/j.catena.2021.105958

Cited by 6 publications

(6 citation statements)

References 39 publications

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“…Our findings suggest the importance of nitrogen availability in driving Q 10 variation under warming conditions, different from previous laboratory results, which emphasized substrate availability [39]. In addition to continuous input from available substrates under natural conditions, we speculated that intact soil profiles in field-based studies may be another reason [43,84]. For example, Sahoo et al [43] found that low temperatures in winter resulted in significant production of available nitrogen in deeper soil layers and that increasing temperatures during the transition from winter to spring benefited the movement of available nitrogen toward the soil surface.…”

Section: Soil Microbial Properties and Q 10 Variationscontrasting

confidence: 99%

“…However, numerous Q 10 values of soil respiration have been estimated using laboratory experiments over the last several decades, and this may have resulted in inaccurate Q 10 estimations [40,41]. Compared to field experiments, laboratory experiments do not consider the continuous input of organic material and the intact soil structure, both of which are important factors mediating soil respiration [39,40,42,43]. As reported previously, respiration from the new input of plant-derived carbon is more sensitive to temperature than that from soil-derived carbon [44], and isolated soil samples destroy the establishment of the temperature gradient-based movement of soil nutrients [43].…”

Section: Introductionmentioning

confidence: 99%

“…Compared to field experiments, laboratory experiments do not consider the continuous input of organic material and the intact soil structure, both of which are important factors mediating soil respiration [39,40,42,43]. As reported previously, respiration from the new input of plant-derived carbon is more sensitive to temperature than that from soil-derived carbon [44], and isolated soil samples destroy the establishment of the temperature gradient-based movement of soil nutrients [43]. Moreover, pre-incubation of laboratory experiments can result in the loss of labile substrate, which is a key factor in the determination of the Q 10 of soil respiration [45].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Soil Acidification on Temperature Sensitivity of Soil Respiration

Jin,

Hua,

Zhan

et al. 2024

Agronomy

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Soil pH significantly impacts microbial activity and community assembly, which in turn determines the temperature sensitivity (Q10) of soil respiration. Due to the high soil acidification in China, it is necessary to understand how soil acidification impacts Q10. Here, the Q10 of soil respiration was examined in a long-term field experiment (1982–present) with different soil pH caused by fertilization management. In this experiment, we selected treatments with neutral pH: (1) no crops and fertilization (CK); (2) crops without fertilization (NF); low pH with (3) crops with chemical fertilization (NPK); and (4) crops with chemical fertilization combined with wheat straw incorporation (WS). Under natural soil temperature changes, we observed that soil acidification lowered the Q10 value of soil respiration. Considering only temperature changes, the Q10 of soil respiration was strongly associated with microbial community composition, alpha diversity, and soil ammonium nitrogen. Considering the interaction between soil pH and temperature, warming strengthened the negative effect of soil pH on the Q10 of soil respiration, and the pathway through which soil pH mediated Q10 included not only microbial community composition, alpha diversity, and biomass but also the soil’s available phosphorus. This work enhanced our insights into the relationships between Q10, temperature, and soil pH by identifying important microbial properties and key soil environmental factors.

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Section: Soil Microbial Properties and Q 10 Variationscontrasting

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Soil Acidification on Temperature Sensitivity of Soil Respiration

Jin,

Hua,

Zhan

et al. 2024

Agronomy

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“…No difference in NO 3 − concentrations at 90 cm occurred between +H and -H within SIL lysimeters in any of the periods of 2017/2018, evidence that the artificial heating mostly affected the coarser soil. A soil warming effect on soil NO 3 − concentrations has been reported in the literature (Groffman et al, 2001;Joseph and Henry, 2008;Patil et al, 2010;Sahoo, 2022). This, combined with the greater likelihood of N adsorption by finer-textured soils due to the chemical properties of clays and their greater surface area for ion exchange (Lazaratou et al, 2020;Nouri et al, 2022), likely lead to the higher NO 3 − concentrations for LS.…”

Section: Discussionmentioning

confidence: 91%

Winter warming effects on soil nitrate leaching under cover crops: A field study using high-frequency weighing lysimeters

Lapierre

Machado²,

Debruyn³

et al. 2022

Front. Environ. Sci.

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Leaching of nitrate (NO3−)—a reactive nitrogen form with impacts on ecosystem health—increases during the non-growing season (NGS) of agricultural soils under cold climates. Cover crops are effective at reducing NGS NO3− leaching, but this benefit may be altered with less snow cover inducing more soil freezing under warmer winters. Our objective was to quantify the effect of winter warming on NO3− leaching from cover crops for a loamy sand (LS) and a silt loam (SIL) soil. This research was conducted over 2 years in Ontario, Canada, using 18 high-precision weighing lysimeters designed to study ecosystem services from agricultural soils. Infra-red heaters were used to simulate warming in lysimeters under a wheat-corn-soybean rotation planted with a cover crop mixture with (+H) and without heating (-H). Nitrate leaching determination used NO3− concentration at 90 cm (discrete sampling) and high temporal resolution drainage volume measurements. Data were analyzed for fall, overwinter, spring-thaw, post-planting, and total period (i.e., November 1 to June 30 of 2017/2018 and 2018/2019). Warming significantly affected soil temperature and soil water content—an effect that was similar for both years. As expected, experimental units under + H presented warmer soils at 5 and 10 cm, along with higher soil water content in liquid form than –H lysimeters, which translated into higher drainage values for + H than –H, especially during the overwinter period. NO3− concentrations at 90 cm were only affected by winter heating for the LS soil. The drainage and NO3− concentrations exhibited high spatial variation, which likely reduced the sensitivity to detect significant differences. Thus, although absolute differences in NO3− leaching between LS vs. SIL and +H (LS) vs. –H (LS) were large, only a trend occurred for higher leaching in LS in 2018/2019. Our research demonstrated that soil heating can influence overwinter drainage (for LS and SIL soils) and NO3− concentration at 90 cm in the LS soil—important NO3− leaching controlling factors. However, contrary to our initial hypothesis, the heating regime adopted in our study did not promote colder soils during the winter. We suggest different heating regimes such as intermittent heating to simulate extreme weather freeze/thaw events as a future research topic.

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“…Still, the degree of skewness of soil temperature became closer to a normal distribution as the depth of soil increased. Compared with shallow soils, deeper soil temperatures were less susceptible to strong influences from soil surface temperatures and seasonal fluctuations in temperature [39]. The results of x std , C v , and C s also show that deeper soil temperatures were more stable and less volatile.…”

Section: Data Analysis and Processingmentioning

confidence: 90%

Evaluation of the Potential of Using Machine Learning and the Savitzky–Golay Filter to Estimate the Daily Soil Temperature in Gully Regions of the Chinese Loess Plateau

Deng,

Liu,

Guo

et al. 2024

Agronomy

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Soil temperature directly affects the germination of seeds and the growth of crops. In order to accurately predict soil temperature, this study used RF and MLP to simulate shallow soil temperature, and then the shallow soil temperature with the best simulation effect will be used to predict the deep soil temperature. The models were forced by combinations of environmental factors, including daily air temperature (Tair), water vapor pressure (Pw), net radiation (Rn), and soil moisture (VWC), which were observed in the Hejiashan watershed on the Loess Plateau in China. The results showed that the accuracy of the model for predicting deep soil temperature proposed in this paper is higher than that of directly using environmental factors to predict deep soil temperature. In testing data, the range of MAE was 1.158–1.610 °C, the range of RMSE was 1.449–2.088 °C, the range of R2 was 0.665–0.928, and the range of KGE was 0.708–0.885 at different depths. The study not only provides a critical reference for predicting soil temperature but also helps people to better carry out agricultural production activities.

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Winter soil temperature and its effect on soil nitrate Status: A Support Vector Regression-based approach on the projected impacts

Cited by 6 publications

References 39 publications

Effect of Soil Acidification on Temperature Sensitivity of Soil Respiration

Effect of Soil Acidification on Temperature Sensitivity of Soil Respiration

Winter warming effects on soil nitrate leaching under cover crops: A field study using high-frequency weighing lysimeters

Evaluation of the Potential of Using Machine Learning and the Savitzky–Golay Filter to Estimate the Daily Soil Temperature in Gully Regions of the Chinese Loess Plateau

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