Plastic-film mulch cropping increases mineral-associated organic carbon accumulation in maize cropped soils as revealed by natural 13C/12C ratio signature

Ma, Qiujin; Zhang, Qian; Niu, Jianbiao; Li, Yong

doi:10.1016/j.geoderma.2020.114350

Cited by 26 publications

(6 citation statements)

References 46 publications

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“…Density fractionation, a widely used physical fractionation method, was used to separate the heavy fraction (density > 1.85 g cm −3 ) and light fraction (density < 1.85 g cm −3 ) of N and C. The procedure for density fractionation of soil was basically derived from Ma, Zhan, Niu, and Li (2020). Fifty grams of air‐dried soil (< 2 mm) were placed in a 250 mL centrifuge bottle to which 150 mL of ZnBr solution with a density of 1.85 g cm −3 was added.…”

Section: Methodsmentioning

confidence: 99%

Influence of nitrogen addition on the changes in nitrogen and carbon fractions in soil profiles of wheat fields

et al. 2021

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Increasing inputs of nitrogen (N) fertilizer greatly affect the functionality of farmland carbon (C) and N cycling. Soil contains various C and N fractions that have diverse chemical and physical characteristics, and they can be used as sensitive evaluation indicators for the change in soil C and N content; however, N application's effects on the deep soil layer N and C fractions of the North China Plain remain unclear. Therefore, we investigated the changes in content, percentage, and sensitivity of N and C fractions under four N fertilization application rates in the upper 200 cm soil layer since 2012. N and C fractions in soil layers respond differently to N enrichment. For grain yield, soil organic carbon (SOC), and total nitrogen (TN) contents, the sensitivity index (SI) of N fractions was the highest at N applications of 180 and 240 kg ha −1 .SOC and TN are most active in the 0-20 cm soil layer. The SI of most C fractions in the topsoil layer were not the highest, and the SI of the N fractions was higher in the middle soil layer. Obvious leaching during the application of 300 kg ha −1 of N fertilizer was indicated by the nitrate content. Under the experimental conditions, the 180 and 240 kg N ha −1 applications proved to be the best for stabilization of C and N and improved crop productivity.

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Section: Methodsmentioning

confidence: 99%

Influence of nitrogen addition on the changes in nitrogen and carbon fractions in soil profiles of wheat fields

et al. 2021

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“…The primary factor contributing to this improvement was the addition of straw, which reduced soil bulk density and provided a substantial amount of organic matter. This, in turn, enhanced root activity and the activity of soil microorganisms [31,32]. The addition of straw and biochar positively affected soil porosity and root growth, which, in turn, facilitated the formation of soil aggregates [33].…”

Section: Effect Of Straw Biochar and N Applications On The Distributi...mentioning

confidence: 99%

“…The enhancement of the mean weight diameter (MWD) of soil aggregates at various depths was effectively achieved by incorporating straw, biochar, and nitrogen (N), as indicated by alternative sieving methods in this study. The observed increase in MWD can be primarily ascribed to reduced soil density and the significant supply of organic matter from straw addition, subsequently fostering microbial activity [32,37]. Both straw and biochar contribute positively to soil porosity, promoting aggregate formation [33].…”

Section: Effect Of Straw Biochar and N Applications On The Stability ...mentioning

confidence: 99%

Enhancing Soil Aggregate Stability and Organic Carbon in Northwestern China through Straw, Biochar, and Nitrogen Supplementation

Wu,

Teng,

Zhong

et al. 2024

Agronomy

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Enhancing soil stability through the incorporation of straw and biochar is well documented. Nevertheless, the combined impact of straw, biochar, and nitrogen supplementation on soil aggregates and organic carbon still needs to be explored, with limited attention given to various sieving methods in the existing literature. Therefore, the current experiment used four sieving methods—routine wet sieving (RoutW), fast-wetting sieving (FastW), slow-wetting sieving (SlowW), and wetting–stirring sieving (WetS)—to investigate the effects of adding straw (0 or 4.5 t ha−1), biochar (from maize straw, 0 or 15 t ha−1), and N (0 or 100 kg ha−1) on soil aggregate stability and soil organic C in silt–loam soil of rainfed farmland in northwest China. The field experiment was started in 2014; soil samples were collected in 2021. The results revealed that straw returned, biochar, and N addition significantly increased soil mean weight diameter (MWD) and soil organic C (SOC). Compared to CN0 (zero-amendment) plots, straw returned with nitrogen addition (SN100) significantly increased the MWD of aggregates by 130.3% (RoutW), 121.66% (FastW), 73.94% (SlowW), and 91.78% (WetS) in the 0–30 cm soil layer. The addition of biochar and nitrogen (BN100) treatment showed the most significant effects on the relative slaking index (RSI), relative mechanical breakdown index (RMI), and SOC; compared with CN0 treatment, BN100 plots can reduce RSI and RMI by 42.90% and 54.66% and increase SOC by 53.27% for all soil layers. Therefore, adding organic materials with N can enhance the stability of soil aggregates and SOC of silt–loam soils in northwest China. Integrating biochar as an organic soil amendment in the agricultural practices of northwest China presents a multifaceted solution that addresses soil health, crop productivity, and environmental sustainability. The current study provides valuable insights that support adopting this innovative approach, paving the way for future sustainable agricultural practices that can benefit both the region and the global community.

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“…However, these techniques can be of low accuracy since the results appear highly dependent on light intensity and leaf age (Yin et al., 2011). Carbon isotope discrimination is a relatively easy and economical method to assess crop WUE as it only requires estimating the carbon isotopic ratio ( 13 C/ 12 C) through mass spectrometry analysis of crop samples such as from leaf, aboveground biomass, or grain (Engoke et al., 2022; Farquhar et al., 1989; Ma et al., 2020). When plants assimilate carbon dioxide (CO 2 ) from the atmosphere through photosynthesis, they discriminate against the heavier 13 C isotope and preferentially fix the lighter 12 C isotope (Eggels et al., 2021; Zheng et al., 2020).…”

Section: Introductionmentioning

confidence: 99%

Determinants of the accuracy of using carbon isotopes in estimating water use efficiency of selected cereal and legume crops: A global perspective

Mutanda,

Chaplot,

Shimelis

et al. 2024

Food and Energy Security

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Field assessments of crop water use efficiency (WUE) are resource‐consuming since they require simultaneous assessment of the total amount of water assimilated by crops for biomass and/or grain production. Alternative methods exist, such as estimating the carbon isotopic ratio (13C/12C) of the crop's leaf, aboveground biomass, or grain samples. There is limited information on the determinants of the accuracy of carbon isotopes in estimating water use efficiency between crop types and environments. Therefore, this study aimed to evaluate the extent to which the estimation of the 13C/12C ratio in crop parts constitutes an accurate proxy of WUE, globally. Data on observed WUE (WUEobs) were collated involving 518 experiments conducted worldwide on major cereals and legumes and compared with WUE estimates (WUEest) from carbon isotopes. The mean WUEobs among all experiments was 3.4 g L−1 and the mean absolute error (MAE) was 0.5 g L−1 or 14.7% of WUEobs, corresponding to accurate predictions at p < 0.05. However, the percentage mean absolute error of observed water use efficiency (%MAE) estimated from grains was 3.6 ± 11.5%, which was lower than the %MAE from aboveground biomass collected at harvest (3 ± 22.8%). In addition, the %MAE increased from 1.1 ± 5.1% for soybean, 1.6 ± 7.2% for maize, 1.2 ± 8.6% for rice, 1.8 ± 12.1% for groundnut, 2.1 ± 14.3% for cowpea, 2.3 ± 16.2% for bush bean, 1.8 ± 19.9% for wheat, 2.2 ± 21.4% for barley to 6.3 ± 39.3% for oat, with only the latter corresponding to significant errors. WUEest were, in all cases, unbiased but slightly overestimated from 0.8% (maize) to 15.4% (oat). The accuracy in estimating WUE significantly decreased with the increase in soil clay content, with sand, showing a positive correlation of 0.3 with %MAE, but negatively correlated with the silt content (r = −0.4). Furthermore, a multivariate analysis pointed out a tendency for prediction errors and bias to increase with the decrease in WUEobs and air temperature. Using carbon isotopes for estimating crop WUE thus appeared reliable for all crops and world environments, provided grain samples are considered. The technique tended to perform better under high WUE conditions, such as those generally found in maize and soybean cropping systems. The identified factors that affect the accuracy of using carbon isotopes in measuring WUE provide valuable insights for water resource management and sustainable crop production. These findings contribute to the ongoing discourse on water conservation strategies in agriculture, offering a basis for decision‐making in crop improvement programs. Implementing the recommended practices from this study can potentially improve yield gains and promote resilient and sustainable agricultural systems in the changing environmental circumstances. Further research should investigate the mechanisms that cause low accuracy of the isotopic technique using aboveground biomass and under arid and cool environments.

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Plastic-film mulch cropping increases mineral-associated organic carbon accumulation in maize cropped soils as revealed by natural 13C/12C ratio signature

Cited by 26 publications

References 46 publications

Influence of nitrogen addition on the changes in nitrogen and carbon fractions in soil profiles of wheat fields

Influence of nitrogen addition on the changes in nitrogen and carbon fractions in soil profiles of wheat fields

Enhancing Soil Aggregate Stability and Organic Carbon in Northwestern China through Straw, Biochar, and Nitrogen Supplementation

Determinants of the accuracy of using carbon isotopes in estimating water use efficiency of selected cereal and legume crops: A global perspective

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