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Xiaobing Liu - One of the best experts on this subject based on the ideXlab platform.
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Responses of Labile Organic Nitrogen Fractions and Enzyme Activities in eroded Mollisols After 8-year Manure Amendment.
Scientific reports, 2018Co-Authors: Yimin Chen, Xiaobing Liu, Xiao-guang Jiao, Yueyu Sui, Zhang Jinyuan, Ke Zhou, Jiu-ming ZhangAbstract:Soil erosion will cause a degradation in soil nitrogen supplying capacity (SNSC) and manure amendment is an effective way to restored eroded soils. Both labile fractions of soil organic N (SON) and N transformation enzymes are indicators for SNSC, but the effect of manure amendments on labile SON fractions and the relationship between labile SON fractions and enzyme activities remains unclear. In this study, five degrees of erosion were simulated in Mollisols (removal of 0, 5, 10, 20 and 30 cm of topsoil) to analyse the changes in labile SON fractions and nitrogen transformation enzyme activities after 8-year manure amendment. We found that soil total N (TN), labile SON fractions and enzyme activities all increased after manure amendments. The largest labile SON fraction was particle organic nitrogen (POM-N) and the second was light fraction organic nitrogen (LFOM-N), which accounted >60% for TN in total. Correlation analysis showed that both urease and protease activities were significantly correlated with POM-N, LFOM-N, microbial biomass N and dissolvable organic N, indicating that both urease and protease activities can be used to predict labile SON pools and enzyme activities worked similarly in indicating SNSC with labile SON fractions. Altogether, 8-year manure amendment could recover SNSC of lightly eroded Mollisols to natural levels, i.e. erosion depths at 5 cm and 10 cm; however, it is not able to recover SNSC in Mollisols suffering severe erosion.
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Diagram illustrating the impact of elevated CO2 on the nodal leaf growth and N assimilation in relation to carbon (C) assimilation and yield response.
2017Co-Authors: Jian Jin, Xiaobing Liu, Guanghua Wang, Caixian Tang, Xiaojuan Wang, Stephen J. HerbertAbstract:Two soybean cultivars were grown in Mollisols with low and high soil organic C. Plants were exposed to 380 or 580 ppm of CO2 for the entire growth stage. Symbol “↑” indicates an increase and “┴” indicates no significant effect.
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The effect of elevated CO2 on chlorophyll content of antepenultimate fully expanded leaf at R5.
2017Co-Authors: Jian Jin, Xiaobing Liu, Guanghua Wang, Caixian Tang, Xiaojuan Wang, Stephen J. HerbertAbstract:Two soybean cultivars, Suinong 14 and Dongsheng 7, were grown in low- and high-SOC Mollisols under ambient (aCO2) (380 ppm) and elevated CO2 (eCO2) (580 ppm). Values are means ± standard error of variables across the twelve replicates. The vertical LSD bars (P = 0.05) are shown. SOC, soil organic C.
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The effect of elevated CO2 on shoot biomass, harvest index (HI), shoot N concentration, shoot N content, N harvest index (NHI) of soybean.
2017Co-Authors: Jian Jin, Xiaobing Liu, Guanghua Wang, Caixian Tang, Xiaojuan Wang, Stephen J. HerbertAbstract:Two soybean cultivars, Suinong 14 and Dongsheng 7, were grown Mollisols. Plants were exposed to ambient (aCO2) (380 ppm) or elevated CO2 (eCO2) (580 ppm). Values are means ± standard error of variables across the four replicates, and the statistical significance level P values for the effects of CO2, cultivar, soil and their interaction are shown. SOC, soil organic C.
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The effect of elevated CO2 on grain yield, pod number, seed number, seed size, node number and branch number of soybean.
2017Co-Authors: Jian Jin, Xiaobing Liu, Guanghua Wang, Caixian Tang, Xiaojuan Wang, Stephen J. HerbertAbstract:Two soybean cultivars, Suinong 14 and Dongsheng 7, were grown in Mollisols. Plants were exposed to ambient (aCO2) (380 ppm) or elevated CO2 (eCO2) (580 ppm). Values are means ± standard error of variables across the four replicates, and the statistical significance levels for the effects of CO2, cultivar, soil and their interaction are shown. SOC, soil organic C.
Xiaozeng Han - One of the best experts on this subject based on the ideXlab platform.
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Characteristics of soil fertility during soil fertilization from parent material of a Mollisol in Northeast China
Ying yong sheng tai xue bao = The journal of applied ecology, 2020Co-Authors: Xiaozeng Han, Ming Sheng, Jinghong LongAbstract:Based on a long-term field experiment located in the central region of Mollisol in Northeast China, we examined the changes of soil fertility and nutrient supply capacity of the newly-formed soils with pot experiment after 14-year different agricultural management practices from parent material (PM) (down to 2.0-3.0 m depth) of a Mollisol, and finally tried to optimize pre-ferential agricultural practices improving soil fertility of seriously eroded PM. After 14-year different agricultural practices, soil organic carbon, total nitrogen, stability of soil aggregate and other rela-ted soil nutrient contents improved compared with PM. Soil fertility level of the newly-developed soils significantly affected nutrient supply capacity for wheat in the pot experiment. Results from principal component analysis showed that soil fertility developed toward to the surface Mollisol after 14 years of different agricultural practices from PM. Surface soils with higher organic carbon inputs in arable soil with chemical fertilizer plus all aboveground biomass incorporated and those in no-tilled alfalfa soil were much approached to surface Mollisol, followed by arable soil with fixed amount of organic inputs and natural fallow soil, while soils without and with only chemical fertilizer were much closed to PM. Our results indicated that 14-year organic carbon inputs improved soil aggregate structure and the decomposition of organic carbon entering into soil, changed soil physical and biochemical properties, and hence caused maturing of soil fertility of PM. Straw returning, organic manure application, and planting alfalfa were recommended for improving soil fertility of eroded soil. These findings would give a better scientific basis for high-efficient fertilization and management practices in eroded Mollisol region.
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Labile and recalcitrant components of organic matter of a Mollisol changed with land use and plant litter management: An advanced 13C NMR study.
The Science of the total environment, 2019Co-Authors: Yao Shuihong, Xiaozeng Han, Zhang Yueling, Ya Han, Jingdong Mao, Bin ZhangAbstract:Abstract Soil organic matter (SOM) changes with land use and soil management, yet the controlling factors over the chemical composition of SOM are not fully understood. We applied quantitative 13C nuclear magnetic resonance and spectral editing techniques to measure chemical structures of SOM from different land use types. The land use types included a native grassland (nGL), a crop land with straw burning in the field (bCL), a restored grassland (rGL) and a cropland with straw removed out of the field (rCL) for 28 years. The abundances of O CH groups from carbohydrates were higher in the SOMs of the nGL and rGL than in those of the rCL and bCL, while the abundances of OCH3 and aromatic C O groups from lignin were higher in the SOMs of the three-ever cultivated lands (rGL, rCL and bCL) than in that of the nGL. Although aromatic C C groups were most dominant in the Mollisols, they did not consistently decrease after the burnings of straw were ceased in the fields of the rCL and rGL compared to the bCL with continuous burning. In addition, the COO groups were bound with the aromatic C C groups in all the land use types, and the sizes of the aromatic clusters were affected by the land use types. The labile and recalcitrant components were correlated with SOC contents the mineral-associated and particular SOM in a contrasting way. Our results suggested that the chemical composition of SOM in the Mollisol depended on land use types, and that labile and recalcitrant components might be protected through mineral associations and aggregation, respectively. The most abundant aromatics in the Mollisols might not just be pyrogenic and could be oxidized to different extents, depending on field drainage conditions.
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Effects of Long-Term Fertilization Strategies on Soil Productivity and Soybean Rhizobial Diversity in a Chinese Mollisol
Pedosphere, 2019Co-Authors: Jun Yan, Xiaozeng Han, Xu Chen, Wenfeng Chen, En Tao Wang, Wenxiu Zou, Zhiming ZhangAbstract:Abstract Rhizobial diversity is affected by interactions between soil features, fertilization strategy, and cropping system. However, interactions among the rhizobial community, chemical-organic manure fertilization, and plant production have not been well documented in Mollisols from long-term experiments. Aimed at maintaining and recovering the productivity of Chinese Mollisols, a long-term fertilization experiment had been carried out for 29 years under a wheat-maize-soybean rotation system, involving the application of recycled organic manure (ROM), chemical fertilizers (N, P, and/or K), or ROM plus N, P, and/or K. In the present study, the effects of different treatments were evaluated by determining soil physicochemical features, soybean production, and soybean rhizobial diversity. The results showed that application of ROM plus NPK maintained or increased soil fertility, which was accompanied by higher production and higher diversity of rhizobia, as compared with the other treatments. The negative association of Bradyrhizobium japonicum with N fertilizer, positive association of B. diazoefficiens with soil pH, and alleviation of N-inhibition on the diversity of Bradyrhizobium by the addition of ROM were recorded as new findings. Therefore, application of ROM or ROM plus NPK could be a feasible strategy for maintaining and recovering the fertility of Chinese Mollisols, whereas rhizobial diversity could be an indicator of soil fertility.
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Impact of long-term application of manure, crop residue, and mineral fertilizer on organic carbon pools and crop yields in a Mollisol
Journal of Soils and Sediments, 2014Co-Authors: Xueli Ding, Ya-ru Yuan, Yao Liang, Xiaozeng HanAbstract:Purpose While the influence of integrated fertility management systems on yield and N cycling in Mollisols is documented, its effect on soil C sequestration remains to be determined. We examined the response of organic C pools and crop yields to 21 years’ organic amendments applied at relatively low rates in a high-C Mollisol to optimize win–win management practices that balance agronomic and environmental interests.
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Nitrous oxide emissions from Mollisols as affected by long-term applications of organic amendments and chemical fertilizers
Science of The Total Environment, 2013Co-Authors: Xiaozeng Han, Meng-yang You, William R. HorwathAbstract:Abstract A field experiment was conducted to evaluate the influences of long-term applications of organic amendments and chemical fertilizers on nitrous oxide (N2O) emissions from Mollisols in northeast China and to relate soil N2O fluxes to soil moisture and temperature. A closed-chamber method was used to determine soil N2O flux during the maize growing season in 2011. In the entire maize growing period, cumulative N2O emissions were significantly (all P 0.05). Nonetheless, even increasing nitrogen inputs, the cumulative microbial N2O emission over 126 days had an upper threshold around 1.2 kg N2O-N ha− 1. Approximately 25–44% of N2O was emitted from the applied organic amendments, and the emission factor (EF) of applied organic amendments as N2O based on 126 days was between 0.07 and 1.52%, higher than NPK fertilizer-induced EF (0.03%). Soil temperature explained 38–96% of the seasonal variation in soil N2O fluxes using exponential models, with a Q10 of 2.01–3.48. Our results suggest that the influences of organic amendments on soil N2O emissions from Mollisols primarily vary with the type of the applied organic amendments, whereas great nitrogen inputs at maximum asymptotically double baseline cumulative emissions.
Jian Jin - One of the best experts on this subject based on the ideXlab platform.
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Diagram illustrating the impact of elevated CO2 on the nodal leaf growth and N assimilation in relation to carbon (C) assimilation and yield response.
2017Co-Authors: Jian Jin, Xiaobing Liu, Guanghua Wang, Caixian Tang, Xiaojuan Wang, Stephen J. HerbertAbstract:Two soybean cultivars were grown in Mollisols with low and high soil organic C. Plants were exposed to 380 or 580 ppm of CO2 for the entire growth stage. Symbol “↑” indicates an increase and “┴” indicates no significant effect.
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The effect of elevated CO2 on chlorophyll content of antepenultimate fully expanded leaf at R5.
2017Co-Authors: Jian Jin, Xiaobing Liu, Guanghua Wang, Caixian Tang, Xiaojuan Wang, Stephen J. HerbertAbstract:Two soybean cultivars, Suinong 14 and Dongsheng 7, were grown in low- and high-SOC Mollisols under ambient (aCO2) (380 ppm) and elevated CO2 (eCO2) (580 ppm). Values are means ± standard error of variables across the twelve replicates. The vertical LSD bars (P = 0.05) are shown. SOC, soil organic C.
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The effect of elevated CO2 on shoot biomass, harvest index (HI), shoot N concentration, shoot N content, N harvest index (NHI) of soybean.
2017Co-Authors: Jian Jin, Xiaobing Liu, Guanghua Wang, Caixian Tang, Xiaojuan Wang, Stephen J. HerbertAbstract:Two soybean cultivars, Suinong 14 and Dongsheng 7, were grown Mollisols. Plants were exposed to ambient (aCO2) (380 ppm) or elevated CO2 (eCO2) (580 ppm). Values are means ± standard error of variables across the four replicates, and the statistical significance level P values for the effects of CO2, cultivar, soil and their interaction are shown. SOC, soil organic C.
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The effect of elevated CO2 on grain yield, pod number, seed number, seed size, node number and branch number of soybean.
2017Co-Authors: Jian Jin, Xiaobing Liu, Guanghua Wang, Caixian Tang, Xiaojuan Wang, Stephen J. HerbertAbstract:Two soybean cultivars, Suinong 14 and Dongsheng 7, were grown in Mollisols. Plants were exposed to ambient (aCO2) (380 ppm) or elevated CO2 (eCO2) (580 ppm). Values are means ± standard error of variables across the four replicates, and the statistical significance levels for the effects of CO2, cultivar, soil and their interaction are shown. SOC, soil organic C.
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Carbon flow in the plant-soil-microbe continuum at different growth stages of maize grown in a Mollisol
Archives of Agronomy and Soil Science, 2016Co-Authors: Jian Jin, Xiaobing Liu, Guanghua WangAbstract:ABSTRACTUnderstanding the photosynthetic carbon (C) dynamics in the plant–soil–microbe continuum is critical to the C sequestration in soils. However, such information is limited in maize (Zea mays L.) in Mollisols. Pot-grown maize was labelled with 13CO2 at the 10-leaf, 15-leaf, heading, milk and dent stages to investigate the photosynthetic C flow in a maize–soil system and its contribution to soil organic carbon (SOC) in Mollisols. The majority of fixed 13C was recovered in shoots, ranging from 44.7% to 78.6%. The allocation of 13C fixed at different growth stages to belowground (roots and soil) gradually decreased over the growing period, indicating that the strength of root C sink is stronger at the early stages. However, the proportion of 13C in dissolved organic C and microbial biomass C to that in SOC significantly increased as the growth stages advanced. Over the entire growth period, the contribution of root-derived C to SOC was estimated to be 5461 mg C plant−1 growth period−1, of which approxi...
Prakash Chandra Srivastava - One of the best experts on this subject based on the ideXlab platform.
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Degradation of Lindane (γ-HCH) in a Mollisol as Effected by Different Soil Amendments
Journal of Environmental Protection, 2011Co-Authors: Gunjan Bhatia, Anjana Srivastava, Prakash Chandra SrivastavaAbstract:Soil amendments play an important role in management of pesticide residues. In this study, incubation experiment was conducted using the surface (0 - 15 cm) sample of a mollisol supplied with different soil amendments (farmyard manure, cow-dung slurry, pyrite and gypsum) to investigate the effect of amendments on the dissipation of lindane in Mollisols. Dissipation of lindane in soil was studied at eight consecutive samplings (0, 1, 3, 5, 7, 10, 15 and 30 d). The results indicated that soil amendments could promote the degradation of lindane in soil. After 30 d of incubation 79% degradation was observed in the untreated soil (without any amendment) whereas, in the case of farmyard manure and cow-dung slurry amended soils, 83% and 91% degradation was observed, respectively. The pyrite and gypsum amendments also enhanced the degradation of lindane in soils, but the effect was less pronounced as compared to the organic amendments. Enhanced degradation in soil treated with organic amendments could be attributed to stimulated microbial activity after the addition of organic amendments. These addition, under different soil management conditions, minimize the persistence of lindane and consequently the risk of leaching and seepage into aquifers
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Kinetics of sorption-desorption of benfuracarb insecticide in Mollisols
Pest management science, 2010Co-Authors: Anjana Srivastava, Raju Chandra, Prakash Chandra SrivastavaAbstract:BACKGROUND: Sorption-desorption processes govern the movement of pesticides in soil. These processes determine the potential hazard of the pesticide in a given environment for groundwater contamination and need to be investigated. RESULTS: In the present study, sorption-desorption processes of benfuracarb were investigated using a batch method in two Mollisols. The kinetics of benfuracarb sorption in Mollisols conformed to two-compartment (1 + 1) first-order kinetics. The fast sorption rate constant was about 3 times higher for silt loam than for loam soil. However, the slow sorption rate constants were statistically similar for both soils. The concentration-dependent sorption-desorption isotherms of benfuracarb could not closely conform to the Freundlich isotherm in Mollisols of high organic C content. The computed values of both the sorption (log K) and desorption (log K') capacities were higher for silt loam than for loam soil. The desorption index (n'/n) values in the range 30.0-41.3 indicated poor reversibility of sorbed benfuracarb in Mollisols. CONCLUSION: In view of the strong sorption of benfuracarb in Mollisols with only partial desorption, the possibility of the leaching of soil-applied benfuracarb to contaminate groundwaters appears to be low.
Ying Zhang - One of the best experts on this subject based on the ideXlab platform.
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Trichloroethylene inhibits nitrogen transformation and microbial community structure in Mollisol.
Ecotoxicology (London England), 2020Co-Authors: Ying Zhang, Qingjuan Meng, Ying Liu, Diogene Tuyiringire, Zhaobo Chen, Shichao LiangAbstract:Trichloroethylene (TCE) is the most ubiquitous halogenated organic pollutant in the environment, it is one of the 129 priority control pollutants. In order to clarify the influence of TCE on microorganisms and nitrogen transformation in Mollisol is the core purpose of this study. Results showed that 10 mg kg−1 TCE is the concentration limit of ammonification in Mollisol. When the concentration of TCE reached 10 mg kg−1 and the effect lasted for over 7 days, the process of ammonia oxidation to nitric acid in Mollisol will be affected. TCE affected the process of nitrate (NO3−) transformation into nitrite (NO2−) by affecting the activity of nitrate reductase, thereby affected the denitrification process in soil. When the concentration of TCE is more than 10 mg kg−1 it reduced the ability of soil microorganisms to obtain nitrogen, thereby affecting soil nitrogen transformation. RDA (Redundancy analysis) showed that the activity of nitrate reductase and the number of nitrifying bacteria and denitrifying bacteria in soil was negatively correlated with the incubation of TCE. In addition, soil nitrate reductase, nitrite reductase, peroxidase activity, ammonifying bacteria, nitrifying bacteria and denitrifying bacteria were negatively correlated with TCE concentration. Beyond that PICRUSt (Phylogenetic Investigation of Communities by Reconstruction of Unobserved States) of functional gene structure depend on KEGG (Kyoto Encyclopedia of Genes and Genomes) showed that 20 mg kg−1 TCE significantly inhibited the metabolism of energy and other substances in Mollisol. Based on the above, it is found that TCE significantly affected nitrification and denitrification in Mollisol, thus the nitrogen transformation in Mollisol was affected by TCE contamination.
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Effects of humic acid on the biodegradation of di-n-butyl phthalate in mollisol
Journal of Cleaner Production, 2020Co-Authors: Yue Tao, Yaqi Jiao, Zhaobo Chen, Hongtao Shi, Siyue Han, Modupe Sarah Akindolie, Yang Yang, Ying ZhangAbstract:Abstract Soil phthalic contamination has received more and more attention due to the widespread use of plastic mulching films. Humic acid (HA) is a natural antidote. The effects of HA on the biodegradation of dibutyl phthalate (DBP) in mollisol was investigated in this study. Through the calculation by bi-exponential model, the half-life of DBP was effectively shortened after adding HA, from 11.65 days to 3.36 days, and soil bulk density decreased. The enhancement mechanism for DBP removal by HA was analyzed by fluorescence spectrometry, two-dimensional FTIR correlation spectroscopy (2D-FTIR-COS) and PLFA analysis. Two major functional groups (aryl C–O and alkyl ester C O) were found at the binding site between DBP and HA. By mediating the transportation of DBP, HA could provide more time for soil microorganisms to degrade DBP. Meanwhile, HA effectively stabilized the mollisol microbial community composition and promote the growth of aerobic bacteria, which contributes to the degradation of DBP. The results are valuable for relieving DBP pollution caused by agricultural production and promoting sustainable use of mollisol.
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Effects of trichloroethylene stress on the microbiological characteristics of Mollisol.
Ecotoxicology and environmental safety, 2019Co-Authors: Ying Zhang, Qingjuan Meng, Ying Liu, Diogene Tuyiringire, Zhaobo Chen, Shichao LiangAbstract:Abstract Trichloroethylene (TCE), one of 129 kinds of priority pollutants, is the most common halogenated organic pollutant in the environment. To explore the changes in soil physicochemical properties and biological activities then clarify the effects of these factors on bacterial, fungal and actinomycetes communities in Mollisol under TCE stress is the significance of our research. The results indicated that when TCE concentration was greater than 10 mg kg−1, soil quality declined and soil decomposition of organic matter and cycling of mineral nutrients were inhibited through an effect on soil microbial biomass. Operational taxonomic units (OTUs) richness of the bacteria in Mollisol was altered by TCE contamination. The SChao1 and HShannon indices of bacterial communities in Mollisol decreased when 40 mg kg−1 TCE was applied. Meanwhile, the OTU richness of fungi in Mollisol was altered by TCE contamination. The HShannon indices of the fungal communities in Mollisol were inhibited by higher TCE concentrations (20 and 40 mg kg−1 TCE). TCE altered the content of some bacteria, fungi and actinomycetes involved in soil carbon and nitrogen cycling and metabolism, such as Acidobacteria, Proteobacteria, Planctomycetes, Chytridiomycota, Streptomycetales, Pseudonocardiales, Propionibacteriales and Rhizobiales, and thus influenced nutrient cycling and the process of energy metabolism in Mollisol. In addition, redundancy analysis (RDA) results indicated that physicochemical properties and biological activities under TCE contamination significantly affected soil microbial community composition thus confirming that TCE interfered with the carbon and nitrogen cycling and metabolism of soil microorganisms. The results of this study are of great importance for revealing the effects of TCE stress on the microbiological characteristics of Mollisol, and also provide more useful information for determining the potential ecological risk of organic pollutants in Mollisol.
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How do root exudates of bok choy promote dibutyl phthalate adsorption on mollisol
Ecotoxicology and environmental safety, 2018Co-Authors: Yulong Lin, Lei Wang, Yifan Wang, Yuewen Xue, Yaqi Jiao, Yahui Wang, Ying ZhangAbstract:Abstract This study investigates the interaction between the bok choy root exudates and dibutyl phthalate (DBP) onto mollisol during the adsorption. The result elucidated that the adsorption reached equilibrium within 12 h, the adsorption capacity of rhizosphere mollisol containing root exudates and ordinary mollisol were 243.46 mg kg−1 and 281.95 mg kg−1, separately. The adsorption kinetics and isotherm model followed the pseudo-second order and the Frendlish model, respectively, which hinted that the adsorption process was multi-layer heterogeneous chemisorption. We characterized the root exudates and analyzed its effects on soil physical and chemical properties and structure. The result revealed that the root exudates contained hydrocarbons, sulfur compounds and acids. Root exudates made the dissolved organic matter (DOM) dissolution from soil and the increase of organic matter, which might be one of the reasons that root exudates promote DBP adsorption on mollisol. We selected three-dimensional excitation-emission matrix (3D-EEM), synchronous fluorescence and Fourier transform infrared spectroscopy (FTIR) to analyze the interactions between root exudates and DBP, DOM and DBP, respectively. Fluorescence spectrum revealed that the main component of root exudates was protein, for DOM was humic acid, the fluorescence of root exudates and DOM gradually disappeared with the increase of DBP concentration. FTIR revealed that -COO in root exudates and -CH2 in DOM respectively reacted with DBP. The results of this study are of great importance to reveal that the root exudates are significant in the environmental behavior of DBP adsorption on mollisol, and also provide more useful information for phytoremediation of organic pollutants in the mollisol.