12 results on '"Li, Fayong"'
Search Results
2. Preparation of carbon-based material with high water absorption capacity and its effect on the water retention characteristics of sandy soil
- Author
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Yang, Youming, Zhong, Mingyang, Bian, Xiuqi, You, Yongjun, and Li, Fayong
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- 2023
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3. Biochar-blended manure modified by polyacrylamide to reduce soil colloidal phosphorus leaching loss
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Li, Fayong, He, Shuang, Liu, Boyi, Yang, Jiao, Wang, Xiaochun, and Liang, Xinqiang
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- 2023
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4. Unveiling the drives behind tetracycline adsorption capacity with biochar through machine learning.
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Zhang, Pengyan, Liu, Chong, Lao, Dongqing, Nguyen, Xuan Cuong, Paramasivan, Balasubramanian, Qian, Xiaoyan, Inyinbor, Adejumoke Abosede, Hu, Xuefei, You, Yongjun, and Li, Fayong
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ADSORPTION capacity ,MACHINE learning ,ARTIFICIAL neural networks ,ANTIBIOTIC residues ,TETRACYCLINE ,ADSORBATES ,TETRACYCLINES ,BIOCHAR - Abstract
This study aimed to develop a robust predictive model for tetracycline (TC) adsorption onto biochar (BC) by employing machine learning techniques to investigate the underlying driving factors. Four machine learning algorithms, namely Random Forest (RF), Gradient Boosting Decision Tree (GBDT), eXtreme Gradient Boosting (XGBoost) and Artificial Neural Networks (ANN), were used to model the adsorption of TC on BC using the data from 295 adsorption experiments. The analysis revealed that the RF model had the highest predictive accuracy (R
2 = 0.9625) compared to ANN (R2 = 0.9410), GBDT (R2 = 0.9152), and XGBoost (R2 = 0.9592) models. This study revealed that BC with a specific surface area (S (BET)) exceeding 380 cm3 ·g−1 and particle sizes ranging between 2.5 and 14.0 nm displayed the greatest efficiency in TC adsorption. The TC-to-BC ratio was identified as the most influential factor affecting adsorption efficiency, with a weight of 0.595. The concentration gradient between the adsorbate and adsorbent was demonstrated to be the principal driving force behind TC adsorption by BC. A predictive model was successfully developed to estimate the sorption performance of various types of BC for TC based on their properties, thereby facilitating the selection of appropriate BC for TC wastewater treatment. [ABSTRACT FROM AUTHOR]- Published
- 2023
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5. Biochar slows gross nitrification and gasses N emission via lower autotrophic nitrification in paddy soils
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Li Fayong, Jin Zhang, Cao Yucheng, Meiru Li, Xinqiang Liang, Guangming Tian, and Shuang He
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Chemistry ,Stratigraphy ,Amendment ,Heterotroph ,04 agricultural and veterinary sciences ,010501 environmental sciences ,01 natural sciences ,Manure ,Environmental chemistry ,Loam ,Biochar ,Soil water ,040103 agronomy & agriculture ,0401 agriculture, forestry, and fisheries ,Nitrification ,Autotroph ,0105 earth and related environmental sciences ,Earth-Surface Processes - Abstract
Laboratory incubation experiments using 15N stable isotope labeling and acetylene suppression techniques were conducted to compare the autotrophic nitrification and heterotrophic nitrification rates with the addition of swine manure (SW) and swine-manure-derived biochar (SWB) in two paddy soils. SW and SWB were applied at four N-based amendment levels, namely control (0 mg N kg−1), low (1.1 mg N kg−1), medium (2.2 mg N kg−1), and high (4.4 mg N kg−1). Twenty-five milliliters of C2H2 gas were injected into each storage bottle to inhibit autotrophic nitrification in soil. At the end of the preincubation period, 160 mg kg−1 15N-glycine were added to each storage bottle to stimulate heterotrophic nitrification in soil. Results showed that SW increased the NH4+-N content by 3.5 to 17.5 mg kg−1 in both soils, while SWB decreased it by 0.1 to 4.7 mg kg−1 compared to control group, regardless of whether autotrophic nitrification was inhibited. Both SW and SWB enhanced NO3−-N accumulation in the two soils compared to control group when autotrophic nitrification was not inhibited; however, NO3−-N concentration in the soil with SWB was up to 24% lower than that with the same level of SW addition. NH3 volatilization rates were elevated at all the SW and SWB amendment levels, although only SW led to higher N2O emission rates. Compared with SW, high level of SWB significantly decreased N2O emissions by 78 to 84% in the loam and clay loam soils. The increase in NH3 volatilization, soil NO3−-N accumulation, and autotrophic nitrification rate were greater with SW than with SWB. Higher rates of soil heterotrophic nitrification were observed in SWB-amended soils than in SW-amended soils with a high (4.4 mg N kg−1) amendment level. Our results suggest that SWB is less likely to increase NO3−-N accumulation in soil and contributes more to the lower soil autotrophic nitrification rate compared with SW. Although SWB can promote heterotrophic nitrification, it generally inhibits the autotrophic nitrification process and slows the increment pace of the gross nitrification in paddy soils.
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- 2019
6. Organic Carbon Linkage with Soil Colloidal Phosphorus at Regional and Field Scales: Insights from Size Fractionation of Fine Particles
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Qian Zhang, Zhuang Ge, Erwin Klumpp, Li Fayong, Volker Nischwitz, Roland Bol, and Xinqiang Liang
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Total organic carbon ,China ,Chemistry ,Phosphorus ,digestive, oral, and skin physiology ,chemistry.chemical_element ,General Chemistry ,Fractionation ,010501 environmental sciences ,01 natural sciences ,Manure ,complex mixtures ,Carbon ,Asymmetric flow field flow fractionation ,Soil ,Environmental chemistry ,Biochar ,Soil water ,Environmental Chemistry ,ddc:333.7 ,Colloids ,0105 earth and related environmental sciences - Abstract
Nano and colloidal particles (1-1000 nm) play important roles in phosphorus (P) migration and loss from agricultural soils; however, little is known about their relative distribution in arable crop soils under varying agricultural geolandscapes at the regional scale. Surface soils (0-20 cm depth) were collected from 15 agricultural fields, including two sites with different carbon input strategies, in Zhejiang Province, China, and water-dispersible nanocolloids (0.6-25 nm), fine colloids (25-160 nm), and medium colloids (160-500 nm) were separated and analyzed using the asymmetrical flow field flow fractionation technique. Three levels of fine-colloidal P content (3583-6142, 859-2612, and 514-653 μg kg-1) were identified at the regional scale. The nanocolloidal fraction correlated with organic carbon (Corg) and calcium (Ca), and the fine colloidal fraction with Corg, silicon (Si), aluminum (Al), and iron (Fe). Significant linear relationships existed between colloidal P and Corg, Si, Al, Fe, and Ca and for nanocolloidal P with Ca. The organic carbon controlled colloidal P saturation, which in turn affected the P carrier ability of colloids. Field-scale organic carbon inputs did not change the overall morphological trends in size fractions of water-dispersible colloids. However, they significantly affected the peak concentration in each of the nano-, fine-, and medium-colloidal P fractions. Application of chemical fertilizer with carbon-based solid manure and/or modified biochar reduced the soil nano-, fine-, and medium-colloidal P content by 30-40%; however,the application of chemical fertilizer with biogas slurry boosted colloidal P formation. This study provides a deep and novel understanding of the forms and composition of colloidal P in agricultural soils and highlights their spatial regulation by soil characteristics and carbon inputs.
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- 2021
7. Biochar slows gross nitrification and gasses N emission via lower autotrophic nitrification in paddy soils.
- Author
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Li, Fayong, Liang, Xinqiang, He, Shuang, Li, Meiru, Cao, Yucheng, Zhang, Jin, and Tian, Guangming
- Subjects
CLAY loam soils ,NITRIFICATION ,BIOCHAR ,SWINE manure ,MANURES ,SOILS ,SANDY loam soils - Abstract
Purpose: Laboratory incubation experiments using
15 N stable isotope labeling and acetylene suppression techniques were conducted to compare the autotrophic nitrification and heterotrophic nitrification rates with the addition of swine manure (SW) and swine-manure-derived biochar (SWB) in two paddy soils. Materials and methods: SW and SWB were applied at four N-based amendment levels, namely control (0 mg N kg−1 ), low (1.1 mg N kg−1 ), medium (2.2 mg N kg−1 ), and high (4.4 mg N kg−1 ). Twenty-five milliliters of C2 H2 gas were injected into each storage bottle to inhibit autotrophic nitrification in soil. At the end of the preincubation period, 160 mg kg−1 15 N-glycine were added to each storage bottle to stimulate heterotrophic nitrification in soil. Results and discussion: Results showed that SW increased the NH4 + -N content by 3.5 to 17.5 mg kg−1 in both soils, while SWB decreased it by 0.1 to 4.7 mg kg−1 compared to control group, regardless of whether autotrophic nitrification was inhibited. Both SW and SWB enhanced NO3 − -N accumulation in the two soils compared to control group when autotrophic nitrification was not inhibited; however, NO3 − -N concentration in the soil with SWB was up to 24% lower than that with the same level of SW addition. NH3 volatilization rates were elevated at all the SW and SWB amendment levels, although only SW led to higher N2 O emission rates. Compared with SW, high level of SWB significantly decreased N2 O emissions by 78 to 84% in the loam and clay loam soils. The increase in NH3 volatilization, soil NO3 − -N accumulation, and autotrophic nitrification rate were greater with SW than with SWB. Higher rates of soil heterotrophic nitrification were observed in SWB-amended soils than in SW-amended soils with a high (4.4 mg N kg−1 ) amendment level. Conclusions: Our results suggest that SWB is less likely to increase NO3 − -N accumulation in soil and contributes more to the lower soil autotrophic nitrification rate compared with SW. Although SWB can promote heterotrophic nitrification, it generally inhibits the autotrophic nitrification process and slows the increment pace of the gross nitrification in paddy soils. [ABSTRACT FROM AUTHOR]- Published
- 2020
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8. Effect of sheep manure-derived biochar on colloidal phosphorus release in soils from various land uses.
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Hosseini, Seyed Hamid, Liang, Xinqiang, Niyungeko, Christophe, Miaomiao, He, Li, Fayong, Khan, Sangar, and Eltohamy, Kamel Mohamed
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PHOSPHORUS in soils ,LAND use ,BIOCHAR ,COLLOIDAL carbon ,SHEEP ,PHOSPHORUS in water ,SOIL solutions ,ALUMINUM ores - Abstract
Colloidal phosphorus (CP) as an additional route of P mobilization in soil solution has gained much attention. A batch experiment was conducted to investigate the effect of sheep manure-derived biochar (SMB) on CP release from various land uses (paddy, vegetable, tea, and citrus) at a rate of 0% as a control treatment (CK), 1% as a low (L) level, 2% as a middle (M) level, and 4% as a high (H) level of SMB application. The CP and MRP
coll in the solution increased from 30.58 to 88.97% and from 2.45 to 55.54% of total P (TP), respectively. The SMB enhanced CP release in all the soils and all the treatments (except CK and L levels in tea soil; CK, L, and M levels in vegetable soil; and L and M levels in citrus soil). Multiple linear regression revealed a significant correlation between CP and MRPcoll and between colloidal iron, aluminum, calcium, and total organic carbon (Fecoll , Alcoll , Cacoll , and TOCcoll ) and pH, which may play an important role as CP carriers that could depend on the pH. This study suggests that the application of SMB in the soil at an appropriate rate of 1 and 2% for tea and vegetable soils, respectively, could be beneficial to avoid the risk of CP release in water bodies. [ABSTRACT FROM AUTHOR]- Published
- 2019
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9. Use of polyacrylamide modified biochar coupled with organic and chemical fertilizers for reducing phosphorus loss under different cropping systems.
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Li, Fayong, Jin, Yingbing, He, Shuang, Jin, Junwei, Wang, Ziwan, Khan, Sangar, Tian, Guangming, and Liang, Xinqiang
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PHOSPHATE fertilizers , *CROPPING systems , *ORGANIC compounds , *BIOCHAR , *DOUBLE cropping - Abstract
• Phosphorus (P) input and crop type cause differences in P loss via runoff. • Modified biochar reduced the runoff P concentration and loss load in all cropping systems. • Solid organic fertilizer decreased particulate P and colloidal P losses. • Biogas slurry increased the P loss in the runoff of the rice-wheat rotation system. Agricultural cropping systems involve the application of high fertilizer rates, which lead to phosphorus (P) losses via surface runoff to the aquatic environment, thereby resulting in severe eutrophication. Here, to evaluate the nutrient loss, we established three monitoring stations in Zhejiang Province, China, in each of which the crop types were double cropping rice, rice–wheat rotation, and vegetable cultivation. Field experiments were conducted with four treatments and three replications over a whole planting year. The four treatments at the same P application rate were: 1) no fertilization (control; CK), 2) chemical fertilization (CF), 3) substitution of 30 % chemical P in CF by organic P in solid sheep manure (OF) or in liquid biogas slurry (BS), and 4) substitution of 30 % chemical P in CF by organic P fertilizers (solid sheep manure or liquid biogas slurry) +1.5 t ha−1 polyacrylamide modified BC (PSB). The runoff losses of various P forms, that is, the total P, total dissolved P, particulate P, and colloidal P losses were analyzed. The total P concentration varied greatly with the crop growth stages. Compared with CF treatment, PSB treatment significantly reduced the concentration of P fractions in the runoff in all three cropping systems, while the OF treatment significantly reduced the particulate P and colloidal P concentrations by coating colloidal particles with organic carbon. However, BS treatment increased particulate P and colloidal P concentrations. Compared with CF treatment, PSB treatment reduced total P loss by 41.1 %, 29.7 %, and 37.8 % in the double cropping rice, rice–wheat, and vegetable systems, respectively. The PSB and OF treatments significantly reduced the particulate P and colloidal P losses, while BS treatment increased the loss of various P forms. Compared with the CF treatment, the PSB treatment significantly increased the available P contents by 12.7–85.4 mg kg-1, and decreased the colloidal P contents by 26.7 %–51.4 % in the soils examined. The results of the redundancy analysis confirmed that P loss via runoff was mainly caused by differences in the P inputs and crop types. The results of this study highlight the important role of PSB in reducing P loss via runoff from agricultural cropping systems. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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10. Biochar–coupled organic fertilizer reduced soil water-dispersible colloidal phosphorus contents in agricultural fields.
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Jin, Junwei, Khan, Sangar, Eltohamy, Kamel Mohamed, He, Shuang, Liu, Chunlong, Li, Fayong, and Liang, Xinqiang
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ORGANIC fertilizers , *DISSOLVED organic matter , *SOIL structure , *AGRICULTURE , *SOILS , *ADSORPTION capacity - Abstract
Soil water-dispersible colloidal phosphorus (WCP) presents high mobility, however, the regulatory effect of biochar-coupled organic fertilizer is rarely known, especially under different cropping patterns. This study investigated the P adsorption, soil aggregate stability, and WCP in three paddy and three vegetable fields. These soils were amended with different fertilizers (chemical fertilizer, CF; substitution of solid-sheep manure or liquid-biogas slurry organic fertilizer, SOF/LOF; substitution of biochar-coupled organic fertilizers, BSOF/BLOF). Results presented that the LOF averagely increased the WCP contents by 50.2% across the sites, but the SOF and BSOF/BLOF averagely decreased their contents by 38.5% and 50.7% in comparison with the CF. The WCP decline in the BSOF/BLOF-amended soils was mainly attributed to the intensive P adsorption capacity and soil aggregate stability. The BSOF/BLOF increased the amorphous Fe and Al contents in the fields in comparison with the CF, which improved the adsorption capacity of soil particles, further improving the maximum absorbed P (Q max) and reducing the dissolved organic matter (DOC), leading to the improvement of > 2 mm water-stable aggregate (WSA >2mm) and subsequent WCP decrease. This was proved by the remarkable negative associations between the WCP and Q max (R2 = 0.78, p < 0.01) and WSA >2mm (R2 = 0.74, p < 0.01). This study manifests that biochar-coupled organic fertilizer could effectively reduce soil WCP content via the improvement of P adsorption and aggregate stability. [Display omitted] • Biochar addition decreased soil water–dispersible colloidal P content. • Biochar addition increased soil P adsorption capacity. • Biochar addition improved soil aggregate stability. [ABSTRACT FROM AUTHOR]
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- 2023
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11. Biochar reduces colloidal phosphorus in soil aggregates: The role of microbial communities.
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Wang, Xiaochun, Eltohamy, Kamel Mohamed, Liu, Chunlong, Li, Fayong, Fang, Yunying, Kawasaki, Akitomo, and Liang, Xinqiang
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SOIL structure , *MICROBIAL communities , *PHOSPHORUS in soils , *BIOCHAR , *BACTERIAL communities , *SOIL amendments - Abstract
Colloidal phosphorus (P coll) in paddy soils can pose a serious threat to the water environment. Biochar amendment not only directly absorb P coll to reduce the runoff loss, but also create hotspots for microbial communities which simultaneously affects soil P coll. However, despite the crucial role of microorganisms, it remains elusive regarding how biochar and its feedstock types affect the relationships of soil microbial communities and P coll in soil matrix (such as at soil aggregate level). To address the knowledge gap, we explored the (in)direct effects of biochar on the soil P coll in physically separated fractions including micro- (53–250 μm) and macroaggregates (250–2000 μm). Results showed that straw and manure biochars decreased the soil P coll content by 55.2–56.7% in microaggregates and 41.2–48.4% in macroaggregates after 120 days of incubation, compared to the respective control. The fungal communities showed a significantly correlation (0.34, p < 0.05) with P coll content in the macroaggregates, whereas the bacterial communities were extremely significantly correlated (0.66, p < 0.001) with P coll content in the microaggregates. Furthermore, the partial least squares path model analysis indicated that biochar amendments directly increased P coll content (0.76 and 0.61) in micro- and macroaggregates, but the reduced P coll content by biochar was mainly derived from indirect effects, such as changed soil biological characteristics carbon (C)/P (−0.69), microbial biomass C (−0.63), microbial biomass P (−0.68), keystone taxa Proteobacteria (−0.63), and Ascomycota (−0.59), particularly for the macroaggregates. This study highlights that to some extent, biochar addition can reduce soil P coll content by affecting microbial communities (some keystone taxa), and soil biological characteristics at soil aggregate level. [Display omitted] • Biochar reduced P coll content by 41.2–56.7% in micro- and macroaggregates. • Soil P coll has a negative response to Proteobacteria and Ascomycota in aggregates. • Biochar reduced soil P coll content via altering soil biological characteristics. [ABSTRACT FROM AUTHOR]
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- 2023
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12. Reduced colloidal phosphorus loss potential and enhanced phosphorus availability by manure-derived biochar addition to paddy soils.
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Wang, Ziwan, Chen, Lingling, Liu, Chunlong, Jin, Yingbing, Li, Fayong, Khan, Sangar, and Liang, Xinqiang
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CLAY loam soils , *BIOCHAR , *LOAM soils , *CATTLE manure , *DISSOLVED organic matter , *SANDY loam soils - Abstract
• Colloidal P was closely related to Olsen-P in paddy soils on a regional scale. • Cattle manure biochar amendment decreased colloidal P in paddy soils. • Cattle manure biochar amendment increased available P in paddy soils. Colloidal phosphorus (P coll) and available phosphorus (AP) are of fundamental importance in the nutrient cycle in soil solutions and subsurface drainage of ecosystems. Although many studies have been conducted on soil P loss and P availability, there remains limited focus on the relationship between P coll and AP. In this regional-scale study, soils with loam texture were collected from 63 paddy fields in southern China to explore the relationships between P coll and AP as well as other soil parameters. Subsequently, three typical paddy soils (sandy loam, silt loam, and clay loam) were incubated to study the effect of cattle manure biochar (CMB) amendment on P coll and AP at three application rates (0, 1, and 2%, w/w) for 30 d. The results showed that P coll was closely related to AP (R 2 = 0.453, P < 0.05) and pH (R 2 = 0. 487; P < 0.05) on a regional scale. In addition, clay loam soils contained higher P coll than the other soil types. The CMB amendment increased the AP by 129.0–872.0% but reduced the P coll by 9.65–22.95%, in which colloidal molybdenum-nonreactive phosphorus (MUP coll) was reduced by 7.69–34.15% and colloidal molybdenum-reactive phosphorus (MRP coll) was reduced by 5.13–22.73%. Multiple linear regression revealed that the release potentials of P coll (R2 = 0.735), MRP coll (R2 = 0.543), and MUP coll (R2 = 0.512) could be predicted by the dissolved organic carbon, total carbon, pH, and AP. Overall, this study confirmed that the application of CMB reduced the loss of P coll from paddy soils and enhanced the soil AP content. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
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