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Liu B.,CAS Shenyang Institute of Applied Ecology | Liu Z.,CAS Shenyang Institute of Applied Ecology | Wang L.,Indiana University - Purdue University Indianapolis | Wang Z.,Liaoning Environmental Monitoring and Experiment Center
Plant and Soil | Year: 2014

Background and aims: The ability of modifying biomass allocation to deal with different environmental stress is an important mechanism for plant population expansion and maintenance in the unstable dune environment where wind erosion persists. However, how biomass is partitioned between horizontal rhizome extension and vertical ramet growth in response to wind erosion has not been fully understood. The objective of this study was to explore how wind erosion affected the relationship between horizontal rhizome extension and vertical ramet growth using a common rhizomatous perennial grass, Phragmites communis. Methods: We dug 300 cm × 200 cm, 80 cm deep pits in a garden experiment plot. Clonal fragments of P. communis were planted individually at a depth of 40 cm in these pits for 4 weeks before treatments. Surface sand was gradually removed to the final depth of 0 (control), 10, 20, 30 and 40 cm (maximum sand removal). Ramet emergence time, rhizome-based and tiller-based ramet number, rhizome number and length, biomass of vertically and horizontally oriented structures were monitored at the end of the experiment. Results: With increasing erosion depth, the proportion of tiller-based ramets (in total number of ramets) increased, whereas that of rhizome-based ramets decreased. With increasing erosion depth, the percentage of vertically oriented structures biomass in total biomass increased significantly, whereas that of horizontally oriented structures biomass decreased. Conclusions: The changes in biomass allocation (i.e., more allocation in vertical than horizontal biomass) together with a trade-off in tiller-based and rhizome-based ramets may enable P. communis to make better use of the resources in erosion conditions and maximize plant population expansion and maintenance. © 2014 Springer International Publishing Switzerland.

Pan F.,Liaoning University | Xu T.,Liaoning Environmental Monitoring and Experiment Center | Yang L.,Liaoning University | Jiang X.,Liaoning University | Zhang L.,Liaoning University
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2014

Bisphenol F (BPF) as an endocrine disrupting compounds (EDCs) pollutant in the environment poses a great threat to human health. To evaluate the toxicity of BPF at the protein level, the effects of BPF on human serum albumin (HSA) were investigated at three temperatures 283, 298, and 308 K by multiple spectroscopic techniques. The experimental results showed that BPF effectively quenched the intrinsic fluorescence of HSA via static quenching. The number of binding sites, the binding constant, the thermodynamic parameters and the binding subdomain were measured, and indicated that BPF could spontaneously bind with HSA on subdomain IIA through H-bond and van der Waals interactions. Furthermore, the conformation of HSA was demonstrably changed in the presence of BPF. The work provides accurate and full basic data for clarifying the binding mechanisms of BPF with HSA in vivo and is helpful for understanding its effect on protein function during its transportation and distribution in blood. © 2014 Elsevier B.V. All rights reserved.

Ying B.,ShenYang Agricultural University | Ying B.,Liaoning Environmental Monitoring and Experiment Center | Lin G.,ShenYang Agricultural University | Jin L.,ShenYang Agricultural University | And 2 more authors.
Huanjing Kexue Xuebao/Acta Scientiae Circumstantiae | Year: 2015

This work investigates the adsorption of 2, 4-Dichlorophenoxyacetic (2, 4-D) in spiked soil with biochar derived from maize straw. The adsorption capacity of soil was enhanced by biochar application. According to equation linear fitting of Langmuir, Freundlich and Redlich-Peterson isotherms, when biochar weight was 0.5%, the theoretical uptake of 2, 4-D reached 58.82 μg·g-1 (initial 2, 4-D concentration of 10 mg·L-1) within 60 h. High correlation coefficients (R2>0.99) suggest that pseudo-second order kinetic model appropriately described the adsorption of 2, 4-D onto biochar-added soil. Further analysis indicated that 2, 4-D adsorption in soil is positively influenced by reaction condition such as pH value and temperature. A pH value of 3.1 and temperature of 40 ℃ suitably ensured the adsorption capacity of biochar-added soil. Results from this study suggest that biochar effectively remediates 2, 4-D-contaminated soil in situ. ©, 2015, Science Press. All right reserved.

Liu X.,Liaoning University | An S.,Liaoning University | Zhou X.,Liaoning Environmental Monitoring and Experiment Center | Zhang L.,Liaoning University | And 3 more authors.
Journal of Dispersion Science and Technology | Year: 2014

Adsorptions of methyl green (MG) and basic fuchsin (BF) by magnetic MgFe2O4 were compared in this study. Adsorption mechanism studies indicated that electrostatic interaction may play a main role for MG, but for BF, hydrogen-bond interaction may be more predominant. Kinetics data of both dyes conformed to the pseudo-second order model. The overall rate process was mainly governed by intraparticle diffusion. Comparative isotherm studies indicated that MG followed the Langmuir isotherm and BF followed the Freundlich isotherm. Thermodynamic parameters revealed that the adsorption process was endothermic (ΔH 0 > 0) for MG, but it was exothermic (ΔH 0 < 0) for BF. © 2014 Taylor & Francis Group, LLC.

Wang X.-P.,CAS Lanzhou Cold and Arid Regions Environmental and Engineering Research Institute | Zhang Y.-F.,CAS Lanzhou Cold and Arid Regions Environmental and Engineering Research Institute | Wang Z.-N.,CAS Lanzhou Cold and Arid Regions Environmental and Engineering Research Institute | Wang Z.-N.,Liaoning Environmental Monitoring and Experiment Center | And 4 more authors.
Hydrological Processes | Year: 2013

Stemflow of xerophytic shrubs was monitored on event basis within a revegetated sand dune. Quantity of stemflow showed a clear species-specific dependence in combination with the rainfall characteristics. Results obtained revealed that for ovate-leaved C. korshinskii with an inverted cone-shaped canopy and smooth bark, the quantity of stemflow in depth accounted for 7.2% of the individual gross rainfall, while it was 2.0% for needle-leaved A. ordosica with a cone-shaped canopy and coarse bark. There were significant positive linear relationships between stemflow and individual gross rainfall and rainfall intensity for the two shrubs. An individual gross rainfall of 1.4 and 1.8 mm was necessary for stemflow generation for C. korshinskii and A. ordosica, respectively. Multiple regression analysis showed that the abiotic and biotic variables including the individual gross rainfall, mean windspeed (WS), canopy height, branch length, and canopy volume have significant influence on stemflow for C. korshinskii, whereas for A. ordosica, the notable influencing variables were individual gross rainfall, stem diameter, and leaf area index. Generally, WS has less effect on stemflow than that of rainfall for A. ordosica. The correlation relationship between individual gross rainfall and funneling ratio showed that the funneling ratio attains its peak when the gross rainfall is 13 and 16 mm for C. korshinskii and A. ordosica, respectively, implying that the canopy morphology emerged as determining factors on funneling ratio decrease when the individual gross rainfall exceeds these values. In comparison, higher WS increased the funneling ratio remarkably for C. korshinskii than A. ordosica due partly to the greater branch length and canopy projection area in C. korshinskii. Funneling ratio can be used as an integrated variable for the effects of canopy morphology and rainfall characteristics on stemflow. The implication of stemflow on water balance and its contribution to sustain the shrubs and the revegetation efforts was discussed. © 2013 John Wiley & Sons, Ltd.

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