Soil and Tillage Research最新文献

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Effects of drying-induced shrinkage on thermal and hydraulic properties of clayey soils
Soil and Tillage Research Pub Date : 2024-12-09 DOI: 10.1016/j.still.2024.106415
Zhengchao Tian, Mouhui Zhang, Jiazhou Chen, Thorsten Knappenberger
{"title":"Effects of drying-induced shrinkage on thermal and hydraulic properties of clayey soils","authors":"Zhengchao Tian, Mouhui Zhang, Jiazhou Chen, Thorsten Knappenberger","doi":"10.1016/j.still.2024.106415","DOIUrl":"https://doi.org/10.1016/j.still.2024.106415","url":null,"abstract":"The shrinkage and swelling phenomenon of clayey soils induces substantial effects on measurement and modeling of soil thermal and hydraulic properties. This study developed a combined heat-pulse and evaporation method for simultaneous measurement of soil deformation, thermal, and hydraulic properties of clayey soils during drying-shrinkage processes. Four clayey soils with different textures and initial bulk densities (ρ<ce:inf loc=\"post\">b</ce:inf>) were subjected to evaporative-drying experiments. The results showed that the shrinkage process significantly altered the soil pore structure, water-holding capacity, and hydraulic conductivity. Neglecting the soil volume change during drying led to an underestimation of soil water retention, with maximum biases of 0.05–0.09 cm<ce:sup loc=\"post\">3</ce:sup> cm<ce:sup loc=\"post\">−3</ce:sup> in the water content (θ) at the same metric potential, and resulted in errors spanning several orders of magnitude in hydraulic conductivity at the same θ condition. The soil thermal properties, including volumetric heat capacity (<ce:italic>C</ce:italic>), thermal conductivity (λ), and thermal diffusivity (α), exhibited distinct trends with changing θ and ρ<ce:inf loc=\"post\">b</ce:inf> compared to rigid soils. The <ce:italic>C</ce:italic> showed strong positive linear correlations with the θ, but the slopes were lower than those for rigid soils due to the offsetting effect of increasing ρ<ce:inf loc=\"post\">b</ce:inf>. The λ first increased and then decreased with the increasing θ, in contrast to the monotonic increase observed in rigid soils. The α had a strong negative linear relationship with the θ, contrary to the typical positive correlation in rigid soils. Meanwhile, effects of the changing ρ<ce:inf loc=\"post\">b</ce:inf> on the thermal properties were opposite than did the variation in θ. The findings highlight the importance of considering soil volume change when characterizing the coupled water-heat transport processes in expansive clayey soils. The developed method provides a useful tool for investigating the complex interactions between soil deformation, thermal and hydraulic properties during drying-wetting cycles.","PeriodicalId":501007,"journal":{"name":"Soil and Tillage Research","volume":"45 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142821052","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Organic fertilizer substitution increased soil organic carbon through the association of microbial necromass C with iron oxides
Soil and Tillage Research Pub Date : 2024-12-07 DOI: 10.1016/j.still.2024.106402
Yinan Xu, Jing Sheng, Liping Zhang, Guofeng Sun, Jianchu Zheng
{"title":"Organic fertilizer substitution increased soil organic carbon through the association of microbial necromass C with iron oxides","authors":"Yinan Xu, Jing Sheng, Liping Zhang, Guofeng Sun, Jianchu Zheng","doi":"10.1016/j.still.2024.106402","DOIUrl":"https://doi.org/10.1016/j.still.2024.106402","url":null,"abstract":"Organic fertilizer was widely used to enhance the buildup of soil organic carbon (SOC) and microbial necromass C. Iron and aluminum (Fe/Al) oxides serve as critical factors influencing SOC by controlling microbial necromass C. Nevertheless, the alterations and dynamics of microbial necromass C alongside Fe/Al oxides in the presence of organic fertilizer remain poorly elucidated. To evaluate the effect of organic fertilizer substitution for chemical fertilizer on Fe/Al oxides and its relationship to microbial necromass C, a site experiment was initiated in 2010 including three treatments: chemical fertilizer (CF), 50 %CF+ 50 % organic fertilizer (50 % OF), and 100 % organic fertilizer (100 %OF). The data were collected after 4, 8, and 13 years of experiments in 2014, 2018, and 2023, respectively. The results showed that organic fertilizer substitution decreased C loss from microbial mineralization and increased microbial necromass C, and thus contributed to SOC accumulation. With experiment duration, SOC content did not increase from 2018 to 2023 under 100 %OF may be due to C saturation, while microbial necromass still had an increasing trend. In 2023, bacterial and fungal necromass C was increased by 157.4 % and 178.5 % under 50 %OF, and by 230.7 % and 337.8 % under 100 %OF compared with CF, respectively. This suggests that prolonged use of organic fertilizer can enhance the stable SOC. Organic fertilizer increased microbial necromass C mainly through promoting the formation of Fe/Al oxides, and Fe oxides had a more important effect than Al oxides. Overall, we concluded that organic fertilizer substitution increased stable SOC sequestration through the association of microbial necromass C with iron oxides.","PeriodicalId":501007,"journal":{"name":"Soil and Tillage Research","volume":"9 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142788898","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Straw return combined with potassium fertilization improves potassium stocks in large-macroaggregates by increasing complex iron oxide under rice–oilseed rape rotation system
Soil and Tillage Research Pub Date : 2024-12-07 DOI: 10.1016/j.still.2024.106404
Zhihao Xiong, Ziyi Gao, Jianwei Lu, Yangyang Zhang, Xiaokun Li
{"title":"Straw return combined with potassium fertilization improves potassium stocks in large-macroaggregates by increasing complex iron oxide under rice–oilseed rape rotation system","authors":"Zhihao Xiong, Ziyi Gao, Jianwei Lu, Yangyang Zhang, Xiaokun Li","doi":"10.1016/j.still.2024.106404","DOIUrl":"https://doi.org/10.1016/j.still.2024.106404","url":null,"abstract":"Potassium (K) supplementation strategies are required to enhance farm productivity in rice-upland rotations, where intensive cultivation practices often result in K deficiencies. Straw return improves the adsorption of K by increasing the content of soil humic acid in macroaggregates. Iron/aluminium (Fe/Al) oxides promote soil organic carbon storage and aggregate stability by acting as binding agents. However, limited information is available on the effects of Fe/Al oxides on the distribution of aggregate-associated K stocks. A field experiment was performed in the Yangtze River Basin, an area with low K stemming from intensive cultivation, with four fertilization treatments: inorganic nitrogen-phosphorus fertilizer (NP), (NPK), inorganic NP with straw return (NP+St), and inorganic NPK with straw return (NPK+St). Results showed that the straw return (NP+St), K fertilization (NPK) and the combination of both (NPK+St) increased soil exchangeable K content (EK) by 32.6 %, 23.7 % and 53.6 % in the rice season, respectively, and increased by 49.9 %, 25.5 % and 182.0 % in the oilseed rape season, respectively, compared with that of no K addition (NP) treatment. K stocks in macroaggregates accounted for more than 90 % of the total K stocks in all treatments. Straw return and K fertilization increased EK and non-exchangeable K (NEK) stocks in large-macroaggregates (&gt;2 mm) by increasing the aggregate-associated K content and regulating the abundance of aggregate. Redundancy analysis showed that complex iron oxide (Fep) was one of the main factors influencing soil available K. The NP+St and NPK+St treatments increased the proportion of particle size and K stocks by increasing the Fep content in large-macroaggregates. Pearson’s correlation analysis and random forest model analysis indicated that EK and NEK stocks in the large-macroaggregates were positively correlated with K uptake by rice and oilseed rape, which suggested that they were key factors influencing K uptake. Therefore, straw return increased Fep in large-macroaggregates to expand the K stock in soil and K uptake by crops under this field experiment conditions. Our results provided new insights with implications for improving soil K availability by straw return combined with K fertilization.","PeriodicalId":501007,"journal":{"name":"Soil and Tillage Research","volume":"82 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142788897","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Comparing WEPP with USLE based models: The role of bare fallow runoff and soil loss plots
Soil and Tillage Research Pub Date : 2024-12-06 DOI: 10.1016/j.still.2024.106413
P.I.A. Kinnell
{"title":"Comparing WEPP with USLE based models: The role of bare fallow runoff and soil loss plots","authors":"P.I.A. Kinnell","doi":"10.1016/j.still.2024.106413","DOIUrl":"https://doi.org/10.1016/j.still.2024.106413","url":null,"abstract":"There are many soil erosion models and model applications. However, as a general rule, models of rainfall erosion cannot fully model the complexity of the detachment and transport processes involved in soil erosion by rain so that it is crucial that soil erosion models are tested against experimental data. In developing the USLE, the designers recognised that the fundamental ability of a model to predict erosion in croplands began with its ability to account for soil losses from bare fallow areas under natural rainfall. Given this, any event-based model perceived to be a replacement for USLE-based models should be first tested for its ability to account for event soil losses from bare fallow areas under natural rain. Comparisons between the abilities of WEPP, RUSLE2 and the USLE-M to account for event soil loss on bare fallow runoff and soil loss plots leads to questions about the capacity of WEPP to model erosion on areas where some storms produce rills but others do not. One reason for this may lie in the fact that, in WEPP, sediment produced by raindrop-driven erosion is moved by flow-driven sediment transport to the outlet in situations where flow-driven sediment transport in channels does not occur. The modelling approach adopted by the designers of the USLE requires the veracity of any alternative erosion model to be established on bare fallow runoff and soil loss plots before focusing on erosion on vegetated areas.","PeriodicalId":501007,"journal":{"name":"Soil and Tillage Research","volume":"47 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142788930","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Evaluation of nutrient spatial distribution and heavy metal pollution improvement in small-scale farmland under the action of biochar and microbial organic fertilizer
Soil and Tillage Research Pub Date : 2024-12-06 DOI: 10.1016/j.still.2024.106386
Zhenyu He, Bo Kang, Leiyu Feng, Yonggao Yin, Jie Yang, Guiqiang Liu, Fusheng Zha
{"title":"Evaluation of nutrient spatial distribution and heavy metal pollution improvement in small-scale farmland under the action of biochar and microbial organic fertilizer","authors":"Zhenyu He, Bo Kang, Leiyu Feng, Yonggao Yin, Jie Yang, Guiqiang Liu, Fusheng Zha","doi":"10.1016/j.still.2024.106386","DOIUrl":"https://doi.org/10.1016/j.still.2024.106386","url":null,"abstract":"Currently, China is undergoing reforms in its rural land transfer policy. As a traditional agricultural country, the operation and management of small-scale farmland serve as the primary economic source for Chinese farmers. However, small-scale farmland is vulnerable to external influences and lacks sufficient risk-resistance capabilities. Developing a low-cost, long-term improvement model is essential for enhancing small-scale farmland.This paper explores the direct integration of biochar and microbial organic fertilizer into the cultivation process of heavy metal-contaminated farmland. The results indicate that the combined application of biochar and microbial organic fertilizer increased soil fertility by 161 % and enhanced the abundance of the antagonistic Chaetomiaceae by 31.6 %. Geostatistical simulations revealed low variation in soil pH, while fertility and water content exhibited high variability. Furthermore, the partial least squares path model confirmed that biochar and organic fertilizer promote.This study elucidates the improvement mechanisms facilitated by biochar and microbial organic fertilizer, providing valuable insights for the management of small-scale farmland in the context of agricultural reform in China.","PeriodicalId":501007,"journal":{"name":"Soil and Tillage Research","volume":"32 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142788899","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Water-stable soil aggregation and associated carbon in a no-till Atwood silt loam soil with cover crops and poultry litter
Soil and Tillage Research Pub Date : 2024-12-05 DOI: 10.1016/j.still.2024.106399
Wei Dai, Gary Feng, Yanbo Huang, Haile Tewolde, Mark W. Shankle, Johnie N. Jenkins
{"title":"Water-stable soil aggregation and associated carbon in a no-till Atwood silt loam soil with cover crops and poultry litter","authors":"Wei Dai, Gary Feng, Yanbo Huang, Haile Tewolde, Mark W. Shankle, Johnie N. Jenkins","doi":"10.1016/j.still.2024.106399","DOIUrl":"https://doi.org/10.1016/j.still.2024.106399","url":null,"abstract":"Knowledge on integrating cover crops and poultry litter effects on soil aggregation and associated carbon remains uncertain. In this study, aggregate size fractions, aggregate stability, and aggregate-associated carbon were examined within the topsoil (0–5 cm depth) across five winter cover crops [no cover crop as a control, cereal rye (<ce:italic>Secale cereale</ce:italic> L.), winter wheat (<ce:italic>Triticum aestivum</ce:italic>), hairy vetch (<ce:italic>Vicia villosa</ce:italic>), and mustard (<ce:italic>Brassica rapa</ce:italic>) plus cereal rye (mix)] and three fertilizer sources (no fertilizer as a control, recommended inorganic fertilizers, and poultry litter) in a split-plot design in no-till upland Atwood silt loam soil. Results demonstrated that the aggregate size 0.25–0.053 mm was the most dominant, containing the largest soil organic carbon (SOC) stock, and contributing significantly to the bulk SOC in no-till upland Atwood silt loam soil. Among the cover crops, the mustard plus cereal rye cover crop increased SOC stock both in bulk soil (10.0 Mg ha<ce:sup loc=\"post\">−1</ce:sup>) and in the 0.25–0.053 mm aggregates (7.1 Mg ha<ce:sup loc=\"post\">−1</ce:sup>). The corresponding increases for poultry litter were 9.7 and 5.9 Mg ha<ce:sup loc=\"post\">−1</ce:sup>, respectively. The highest values for aggregate stability index, mean weight diameter, and geometric mean diameter (56.8 %, 1.0 mm, and 0.6 mm, respectively) were obtained under winter wheat cover crop, while fractal dimension and soil erodibility factor were highest (2.8 and 0.14, respectively) under no cover crop. Multivariate analysis revealed the &gt; 2 mm aggregates was the most dominant predictor for the stability of soil aggregates, suggesting its pivotal role in affecting soil aggregate stability. Aggregate-associated carbon positively correlated with aggregate stability index. Overall, integrating cover crops such as winter wheat and mustard plus cereal rye, along with poultry litter, can increase the stability of soil aggregates and improve SOC stock, which may further enhance the sequestration potentials of soil carbon and decrease the threat of soil degradation and erosion in agricultural systems.","PeriodicalId":501007,"journal":{"name":"Soil and Tillage Research","volume":"27 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142788903","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A six-site field study on assessing the suitability of conservation and conventional tillage in the black soil region, Northeast China
Soil and Tillage Research Pub Date : 2024-12-05 DOI: 10.1016/j.still.2024.106379
Fahui Jiang, Xinhua Peng, Shuihong Yao, Mahbub Ul Islam, Zhongbin Zhang, Baoyu Chen, Yuxian Wang, Nan Wang, Hua Qi, Zhengyu Wang, Xiangwei Gong, Xinwei Xue, Fansheng Meng
{"title":"A six-site field study on assessing the suitability of conservation and conventional tillage in the black soil region, Northeast China","authors":"Fahui Jiang, Xinhua Peng, Shuihong Yao, Mahbub Ul Islam, Zhongbin Zhang, Baoyu Chen, Yuxian Wang, Nan Wang, Hua Qi, Zhengyu Wang, Xiangwei Gong, Xinwei Xue, Fansheng Meng","doi":"10.1016/j.still.2024.106379","DOIUrl":"https://doi.org/10.1016/j.still.2024.106379","url":null,"abstract":"In Northeast China’s primary granary, long-term conventional tillage (CT) has led to significant soil degradation in the high-fertility black soil. Conservation tillage (CS) presents an opportunity to preserve soil quality but may reduce crop yield. The suitability of CT and CS in black soil regions and underlying mechanisms are not clear. This study aimed to investigate the impact of CT and CS on soil quality, crop yield and associated influencing factors at a regional scale. A comprehensive field experiment spanning six sites across the black soil region was conducted to evaluate the effects of rotary tillage (RT, traditional practice), no-tillage (NT, a form of CS), and deep ploughing (DP, representing CT) on maize yield and soil physicochemical properties. Results revealed that NT significantly enhanced total and available soil nutrients, along with soil organic carbon (SOC) content in surface layer (0–20 cm), compared to RT. Conversely, DP improved these soil properties in the subsurface layer (20–40 cm) across various sites. Notably, SOC accumulation rates were higher in warmer than cooler regions under NT. NT also significantly increased soil water content throughout the entire growth season and subsequently decreased soil temperature during the seeding stage, particularly in semi-arid areas. DP slightly increased soil water content and maintained a similar soil temperature compared to RT in both semi-arid and semi-humid areas. Variable partitioning analysis (VPA) highlighted the significant influence of soil bulk density, nutrient contents, and hydrothermal properties on yield variation under NT and DP compared to RT. Under NT, these factors contributed to 77 %, 81 %, and 63 % of yield variation, respectively, while for DP, the contributions were 65 %, −33 %, and 70 %. Our findings suggest that NT effectively preserves soil quality, conserves water, and sequesters carbon in semi-arid areas, leading to optimal maize production. Alternatively, DP with straw incorporation shows more variable yields and promises more positive outcomes in semi-humid areas.","PeriodicalId":501007,"journal":{"name":"Soil and Tillage Research","volume":"88 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142788916","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Restoration of compacted soils using artificial pores under freeze–thaw conditions
Soil and Tillage Research Pub Date : 2024-12-05 DOI: 10.1016/j.still.2024.106401
Tingfeng He, Huiqing Zhang, Huatao Liu, Liu Enke, Qishuo Ding
{"title":"Restoration of compacted soils using artificial pores under freeze–thaw conditions","authors":"Tingfeng He, Huiqing Zhang, Huatao Liu, Liu Enke, Qishuo Ding","doi":"10.1016/j.still.2024.106401","DOIUrl":"https://doi.org/10.1016/j.still.2024.106401","url":null,"abstract":"Soil compaction caused by the use of farm machinery is a widespread issue. Freeze<ce:italic>–</ce:italic>thaw cycles can improve the soil structure after compaction; however, the effect decreases as soil depth increases. Herein, we applied freeze–thaw cycle treatments to re-moulded compacted sandy loam soil (bulk density of 1.6 g/cm³) in two water content states (80 % and 30 % field capacities). Artificial perforation was performed to create long, straight pores in soil, which ensured that the soil mass was largely intact and unbroken, leaving the freeze<ce:italic>–</ce:italic>thaw cycles to complete the structural remediation and monitoring soil structure recovery. We measured the soil temperature, heat flux and thermal properties to explore the mechanisms of soil temperature regulation using artificial pores during freeze–thaw cycles. The pore and aggregate structure parameters before and after the freeze–thaw cycle treatment were measured. Under the freeze–thaw cycle treatment, the temperature in the bottom layer of compacted soil with artificial pores rapidly dropped below 0°C during the third and second cycles under high- and low-water-content conditions, respectively, whereas the temperature of soil without artificial pores decreased during the seventh and fourth cycles at the same water content states. Results indicated that the heat flux during the freezing phase was larger in the soil with artificial pores. However, no significant differences were observed in the thermal parameters, including thermal conductivity, volumetric heat capacity and thermal diffusivity, of soils with and without artificial pores at each water content state. The air-filled porosity, aggregate mean weight diameter and structure coefficient of the surface and bottom layers of the compacted soil columns were generally better in soil with artificial pores than in soil without artificial pores after repeated freeze–thaw cycles. This indicates that the artificial pores facilitated the restoration of compacted soil in the bottom layer during freeze–thaw cycles owing to the rapid drop in soil temperature. We deduced that the artificial long, straight pores in compacted soil created additional soil heat exchange areas in the heat transfer process to increase the rate of heat transfer, thus increasing soil heat exchange and causing the soil temperature of the bottom layer to drop rapidly during repeat freezing and thawing. However, further studies are required to investigate the remediation of artificial pores on compacted soils in fields and the optimal process for creating artificial pores in agricultural settings.","PeriodicalId":501007,"journal":{"name":"Soil and Tillage Research","volume":"88 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142788900","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The role of soil pore structure on nitrate release from soil organic matter and applied fertilizer under three fertilization regimes
Soil and Tillage Research Pub Date : 2024-12-05 DOI: 10.1016/j.still.2024.106396
Renjie Ruan, Zhongbin Zhang, Ting Lan, Yaosheng Wang, Wei Li, Huan Chen, Xinhua Peng
{"title":"The role of soil pore structure on nitrate release from soil organic matter and applied fertilizer under three fertilization regimes","authors":"Renjie Ruan, Zhongbin Zhang, Ting Lan, Yaosheng Wang, Wei Li, Huan Chen, Xinhua Peng","doi":"10.1016/j.still.2024.106396","DOIUrl":"https://doi.org/10.1016/j.still.2024.106396","url":null,"abstract":"Soil pore structure is highly variable with soil management practices, and plays an important role in nutrient availability. However, the relationships between soil pore characteristics (pore connectivity and pore size distribution) and nitrate release from soil organic matter or applied fertilizer are still unclear. This study aimed to identify how soil pore structure affects nitrate release under three fertilization regimes: Control (no fertilization), NPK (mineral NPK fertilization), and OF (organic fertilization). Soil samples were subjected to three physical disturbances (Intact, Repacked, and Compacted) for each fertilization treatment to alter soil pore structure characteristics which were quantified using computed tomography (CT). Nitrate release derived from soil organic matter (Ndfs) and applied fertilizer (Ndff) was distinguished with <ce:sup loc=\"post\">15</ce:sup>N labelled urea and leached during an incubation. The results showed a decrease in cumulative Ndff in the NPK and OF treatments, compared to the Control, while an increase in cumulative Ndfs in the OF treatment, compared to the Control. Cumulative Ndff was higher in the Repacked treatment, but lower in the Compacted treatment, than in the Intact treatment. Correlation analysis showed that cumulative Ndfs was positively influenced by soil organic carbon content (SOC) and ammonia-oxidizing bacteria abundance, while cumulative Ndff was negatively influenced by SOC. Furthermore, cumulative Ndfs was not associated with soil pore characteristics; however, cumulative Ndff was positively associated with macroporosity, macropore connectivity, and the porosities of pores with diameters in the ranges of 100–500 μm and 500–1000 μm. Path analysis indicated that 100–500 μm pores indirectly influenced the potential and rate of Ndff by modulating water holding capacity and air permeability. Our findings provide a novel perspective, indicating that soil pore structure characteristics significantly influence nitrate release from applied fertilizer rather than that from soil organic matter, with porosity of 100–500 μm being particularly effective in influencing nitrate release from applied fertilizer.","PeriodicalId":501007,"journal":{"name":"Soil and Tillage Research","volume":"20 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142788936","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Decoding rainfall effects on soil surface changes: Empirical separation of sediment yield in time-lapse SfM photogrammetry measurements
Soil and Tillage Research Pub Date : 2024-12-05 DOI: 10.1016/j.still.2024.106384
Lea Epple, Oliver Grothum, Anne Bienert, Anette Eltner
{"title":"Decoding rainfall effects on soil surface changes: Empirical separation of sediment yield in time-lapse SfM photogrammetry measurements","authors":"Lea Epple, Oliver Grothum, Anne Bienert, Anette Eltner","doi":"10.1016/j.still.2024.106384","DOIUrl":"https://doi.org/10.1016/j.still.2024.106384","url":null,"abstract":"Camera-based soil surface change measurement is a cost-efficient and non-invasive approach to assess soil erosion. A challenging aspect in this context is the obscuring of the sediment yield by subsidence phenomenon such as soil consolidation and compaction in the beginning of a rainfall event (masking effect). Based on the camera elevation changes and measured field observations, we develop an approach to estimate these masking effects and to approximate a correction function. We therefore conduct ten rainfall simulations (3 m x 1 m) on different agricultural slopes, measuring runoff and sediment concentration. With a time-lapse camera system, we generate high resolution digital elevation models every 20 s. An s-shaped curve is fitted via non-linear regression for every rainfall simulation. We use the variables of these functions as well as a combination of the different field observations – bulk density, soil moisture, grain size distribution, total organic carbon, slope steepness, surface cover and surface roughness – as input values for an adjustment. We are able to estimate the masking effects at the beginning of rainfall events as functions of soil and plot characteristics and therefore offer a potential to increase the informative value of camera-based soil erosion measurements on agricultural fields.","PeriodicalId":501007,"journal":{"name":"Soil and Tillage Research","volume":"37 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142788939","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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