Resolving the spatial variability of soil N using fractions of soil organic matter

Córdova, Carolin; Sohi, Saran; Lark, R. M.; Goulding, Keith; Robinson, Jenny

doi:10.1016/j.agee.2011.06.016

Cited by 12 publications

(7 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…As a key determinant of soil fertility and quality, TN also plays a vital part in generating and maintaining soil productivity in agricultural ecosystems (Wang et al 2015;Zhang et al 2016;Ma et al 2018). Therefore, knowledge of the spatial variability in SOC and TN is indispensable to evaluate ecosystem productivity (Córdova et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Spatial variability of soil organic carbon and total nitrogen in the hilly red soil region of Southern China

Yao

Deng

et al. 2019

J. For. Res.

View full text Add to dashboard Cite

To obtain accurate spatial distribution maps of soil organic carbon (SOC) and total nitrogen (TN) in the Hetian Town in Fujian Province, China, soil samples from three depths (0-20, 20-40, and 40-60 cm) at 59 sampling sites were sampled by using traditional analysis and geostatistical approach. The SOC and TN ranged from 2.26 to 47.54 g kg -1 , and from 0.28 to 2.71 g kg -1 , respectively. The coefficient of variation for SOC and TN was moderate at 49.02-55.87% for all depths. According to the nuggetto-sill ratio values, a moderate spatial dependence of SOC content and a strong spatial dependence of TN content were found in different soil depths, demonstrating that SOC content was affected by both extrinsic and intrinsic factors while TN content was mainly influenced by intrinsic factors. Indices of cross-validation, such as mean error, mean standardized error, were close to zero, indicating that ordinary kriging interpolation is a reliable method to predict the spatial distribution of SOC and TN in different soil depths. Interpolation using ordinary kriging indicated the spatial pattern of SOC and TN were characterized by higher in the periphery and lower in the middle. To improve the accuracy of spatial interpolation for soil properties, it is necessary and important to incorporate a probabilistic and machine learning methods in the future study.

show abstract

Section: Introductionmentioning

confidence: 99%

Spatial variability of soil organic carbon and total nitrogen in the hilly red soil region of Southern China

Yao

Deng

et al. 2019

J. For. Res.

View full text Add to dashboard Cite

show abstract

“…Nitrogen (N) is one of the most important soil nutrients in farmland, even it is the limiting nutrient in many agroecosystems, especially in terms of available nitrogen (AN), which highly correlates with fertilization, tillage methods, and crop choice (Crabtree & Bernston, ; Brady & Weil, ). A better understanding of the spatial variability of AN and its driving factors is crucial for refining soil and crop management practices, slowing down land degradation, and developing and improving sustainable land use practices (Córdova et al, ; Brady & Weil, ).…”

Section: Introductionmentioning

confidence: 99%

Spatiotemporal Heterogeneity of Soil Available Nitrogen During Crop Growth Stages on Mollisol Slopes of Northeast China

et al. 2016

View full text Add to dashboard Cite

Spatiotemporal heterogeneity of soil available nitrogen (AN) (sum of NO3−–N and NH4+–N) is the essential basis for soil management and highly correlates to crop yield. Both geostatistical and traditional analyses were used to describe the spatiotemporal distribution of AN in the 0–20‐cm soil depth on typical Mollisol slopes (S1 and S2) in Northeast China. The concentration of NO3−–N dynamics at slope positions was typically opposite to NH4+–N. The peak values of AN typically moved from the summit of the slope to the bottom from spring to autumn and were mainly influenced by the content of NO3−–N (S1, 7·9–18·9 mg kg−1; S2, 1·2–103·6 mg kg−1), both of NO3−–N (S1, 3·9–8·3 mg kg−1; S2, 2·2–28·0 mg kg−1) and NH4+–N (S1, 21·4–30·5 mg kg−1; S2, 2·1–23·3 mg kg−1), and NH4+–N (S1, 10·5–28·9 mg kg−1; S2, 5·0–39·0 mg kg−1) in the seedling stage, vegetative growth stage, and reproductive growth stage, respectively. The spatial autocorrelation of AN was strong and was mainly influenced by structural factors during crop growth stages. This was mainly determined by soil erosion–deposition (SED) and soil temperature–moisture (STM) in the seedling stage; this was also mainly influenced by SED, STM, crop type, and crop growth in the vegetative growth stage and by early STM and early SED in the reproductive growth stage. Generally, the content of AN, NO3−–N, and NH4+–N on the whole slope was mainly determined by the early SED and local fertilizer application, while their spatiotemporal heterogeneity, especially the evenness, was mainly changed by SED, STM, crop growth, and crop types on the slope scale. In order to increase more crop yields, additional N fertilizer application on both the summit and the bottom during the vegetative growth stage and conservation tillage systems or additional soil amendments on the back slopes was necessary. Copyright © 2016 John Wiley & Sons, Ltd.

show abstract

“…For the Diguillin soil, the proportion of SOC present as FR–SOM was quite typical of values found in temperate nonvolcanic soils (Poirier et al ., ; Córdova et al ., ). However in the Santa Barbara soil, the proportion was consistently at the high end of this range and substantially exceeded it in the mixed rotations (12.3–13.5%).…”

Section: Discussionmentioning

confidence: 97%

“…However in the Santa Barbara soil, the proportion was consistently at the high end of this range and substantially exceeded it in the mixed rotations (12.3–13.5%). In contrast, for both soils, the amount of C present in the IALF was extremely small, and well below the range typical for nonvolcanic soils (2.0–5.6%, Poirier et al ., ; Sohi et al ., ; Córdova et al ., ); in the Diguillin and Santa Barbara soils, it was always <1%, and sometimes <0.2% at Diguillin.…”

Section: Discussionmentioning

confidence: 99%

Free and intra‐aggregate organic matter as indicators of soil quality change in volcanic soils under contrasting crop rotations

Zagal

Córdova

Sohi

et al. 2013

Soil Use and Management

View full text Add to dashboard Cite

Soil physical fractionation techniques may provide indicators of changing soil organic carbon (SOC) content; however, they have not been widely tested on volcanic soils (Andisols). In this study, we assessed two fractions as potential indicators in volcanic soils, using two sites in Chile converted from natural grassland to arable and mixed crop rotations, 8 and 16 yr previously. In the 8‐yr experiment, SOC had declined under all rotations, with smaller changes where the rotation included 3 or 5 yr of perennial pasture. Whereas the average SOC was only 76% of the level in the preceding natural grassland, the corresponding value after 16 yr for the second site was 98% (and 93% under continuous arable), probably reflecting its high allophane clay content. The fractionation procedure tested proved applicable to both Andisols, but the intra‐aggregate light fraction (IA‐SOM, isolated in sodium iodide solution at 1.80 g/cm3 after ultrasonic dispersion) accounted for a very small proportion of total SOC (<1%). We suggest that in Andisols, the free light fraction (FR‐SOM, isolated in sodium iodide at solution of the same density, but prior to ultrasonic dispersion) is stabilised to a greater extent than in nonvolcanic soils, and the intra‐aggregate fraction plays a more minor role as a pool of intermediate turnover. The relative value of each fraction needs to be confirmed through dynamic experiments, using more sites, and including situations where SOC content is initially low.

show abstract

Resolving the spatial variability of soil N using fractions of soil organic matter

Cited by 12 publications

References 31 publications

Spatial variability of soil organic carbon and total nitrogen in the hilly red soil region of Southern China

Spatial variability of soil organic carbon and total nitrogen in the hilly red soil region of Southern China

Spatiotemporal Heterogeneity of Soil Available Nitrogen During Crop Growth Stages on Mollisol Slopes of Northeast China

Free and intra‐aggregate organic matter as indicators of soil quality change in volcanic soils under contrasting crop rotations

Contact Info

Product

Resources

About