Soda residue(SR)is a type of industrial waste produced in the soda process with the ammonia-soda method.Applying SR to backfilling solves the land occupation and environmental pollution problems in coastal areas and s...Soda residue(SR)is a type of industrial waste produced in the soda process with the ammonia-soda method.Applying SR to backfilling solves the land occupation and environmental pollution problems in coastal areas and saves material costs for foundation engineering.The strength characteristics of soda residue soil(SRS)under different consolidation conditions are the key points to be solved in the engineering application of SRS.Triaxial compression tests were performed on the undisturbed SRS of Tianjin Port.The shear properties of SRS under different consolidation conditions were then discussed.Meanwhile,a structural strength model(SSM)based on Mohr-Coulomb theory was proposed.SSM reflects the influence of soil structure on undrained strength(Cu)and divides the Cu into the following two parts:friction strength(C_(uf))and original structural strength(C_(u0)).C_(uf)characterizes the magnitude of friction between soil particles,which is related to the consolidation stress.Meanwhile,C_(u0)represents the structural effect on soil strength,which is related to the soil deposition and consolidation processes.SSM was validated by the test data of undisturbed soils.Results reveal that the undisturbed soil generally had a certain C_(u0).Therefore,the SRS strength model was established by combining the experimental law of SRS with SSM.Error analysis shows that the SRS strength model can effectively predict the Cu of undisturbed SRS in Tianjin Port under different consolidation conditions.展开更多
Under artificially-simulated complex salt-alkali stress, the levels of active oxygen metabolism in roots were studied using three-year-old cutting seedlings of Spiraea × bumalda ‘Gold Mound＇ and Spiraea × ...Under artificially-simulated complex salt-alkali stress, the levels of active oxygen metabolism in roots were studied using three-year-old cutting seedlings of Spiraea × bumalda ‘Gold Mound＇ and Spiraea × bumalda ‘Gold Flame＇. The present study aimed at exploring the antioxidant capacity in roots of spiraeas and revealing their adaptability to salt-alkali stress. Results indicate that the oxygen free radicals contents, electrolyte leakage rates and MDA contents in roots of Spiraea × bumalda ＇Gold Mound＇ and Spiraea × bumalda ＇Gold Flame＇ show an increasing tendency with the increases of the salinity and pH value, whereas the activities of superoxide dismutase （SOD）, peroxidase （POD） and catalase （CAT） all increased firstly and then decreased. With the increase in intensity of salt-alkali stress, the CAT activity in roots of Spiraea × bumalda ‘Gold Flame＇ is higher and the increasing extents in the oxygen free radicals contents, electrolyte leakage rates as well as MDA contents are lower compared with Spiraea × bumalda ‘Gold Mound＇, indicating that Spiraea × bumalda ‘Gold Flame＇ has a stronger antioxidant capacity.展开更多
Aiken base silicon,advanced silicon,activated carbon,desulphurization gypsum,ferric phosphate,humic acid,aluminum dihydrogen phosphate etc.were used as raw meterials to conduct the compound development of salt-alkali ...Aiken base silicon,advanced silicon,activated carbon,desulphurization gypsum,ferric phosphate,humic acid,aluminum dihydrogen phosphate etc.were used as raw meterials to conduct the compound development of salt-alkali soil amendents,and the salt-tolerant rice"Chaoyouqianhao"was used as the test variety to verify the effect of increasing yield under simulated salt stress environment.The results showed that at the tillering stage,the growth indexes of rice plant in the treatment with soil amendements were better than that in the treatment without soil amendments(CK2).Of which,T5 and T6 had the best effect,and the dry weight of rice plant increased by 40.99%and 70.06%,respectively,compared to the CK2.At the maturity stage,T5,T6 and T7 had a better effect on the increase of rice yield.Of which,T5 had the highest yield,up to 6533.32 kg/hm^(2),which increased by 29.97%compared to the CK2.Focused on the soil amendments formulation in the T5 and T6,the two formulations all contained ferric phosphate,humic acid,calcium magnesium phosphate fertilizer,indicating that these substances played an important role in saline-alkali soil improvement.展开更多
基金the financial support from the National Natural Science Foundation of China(No.51979191)the National Key Research and Development Program of China(Nos.2016YFC0802204,2016YFC0802201)+2 种基金the National Natural Science Fund for Innovative Research Groups Science Foundation(No.51321065)the Construction Science and Technology Project of the Ministry of Transport of the People’s Republic of China(No.2014328224040)the Science and Technology Plan Project of Tianjin Port(No.2020-165)。
文摘Soda residue(SR)is a type of industrial waste produced in the soda process with the ammonia-soda method.Applying SR to backfilling solves the land occupation and environmental pollution problems in coastal areas and saves material costs for foundation engineering.The strength characteristics of soda residue soil(SRS)under different consolidation conditions are the key points to be solved in the engineering application of SRS.Triaxial compression tests were performed on the undisturbed SRS of Tianjin Port.The shear properties of SRS under different consolidation conditions were then discussed.Meanwhile,a structural strength model(SSM)based on Mohr-Coulomb theory was proposed.SSM reflects the influence of soil structure on undrained strength(Cu)and divides the Cu into the following two parts:friction strength(C_(uf))and original structural strength(C_(u0)).C_(uf)characterizes the magnitude of friction between soil particles,which is related to the consolidation stress.Meanwhile,C_(u0)represents the structural effect on soil strength,which is related to the soil deposition and consolidation processes.SSM was validated by the test data of undisturbed soils.Results reveal that the undisturbed soil generally had a certain C_(u0).Therefore,the SRS strength model was established by combining the experimental law of SRS with SSM.Error analysis shows that the SRS strength model can effectively predict the Cu of undisturbed SRS in Tianjin Port under different consolidation conditions.
基金supported by Innovation Team Project of Northeast Agricultural University of P. R. China (CXZ004-3)Science Foundation of Heilongjiang Province (C2007-16)
文摘Under artificially-simulated complex salt-alkali stress, the levels of active oxygen metabolism in roots were studied using three-year-old cutting seedlings of Spiraea × bumalda ‘Gold Mound＇ and Spiraea × bumalda ‘Gold Flame＇. The present study aimed at exploring the antioxidant capacity in roots of spiraeas and revealing their adaptability to salt-alkali stress. Results indicate that the oxygen free radicals contents, electrolyte leakage rates and MDA contents in roots of Spiraea × bumalda ＇Gold Mound＇ and Spiraea × bumalda ＇Gold Flame＇ show an increasing tendency with the increases of the salinity and pH value, whereas the activities of superoxide dismutase （SOD）, peroxidase （POD） and catalase （CAT） all increased firstly and then decreased. With the increase in intensity of salt-alkali stress, the CAT activity in roots of Spiraea × bumalda ‘Gold Flame＇ is higher and the increasing extents in the oxygen free radicals contents, electrolyte leakage rates as well as MDA contents are lower compared with Spiraea × bumalda ‘Gold Mound＇, indicating that Spiraea × bumalda ‘Gold Flame＇ has a stronger antioxidant capacity.
文摘Aiken base silicon,advanced silicon,activated carbon,desulphurization gypsum,ferric phosphate,humic acid,aluminum dihydrogen phosphate etc.were used as raw meterials to conduct the compound development of salt-alkali soil amendents,and the salt-tolerant rice"Chaoyouqianhao"was used as the test variety to verify the effect of increasing yield under simulated salt stress environment.The results showed that at the tillering stage,the growth indexes of rice plant in the treatment with soil amendements were better than that in the treatment without soil amendments(CK2).Of which,T5 and T6 had the best effect,and the dry weight of rice plant increased by 40.99%and 70.06%,respectively,compared to the CK2.At the maturity stage,T5,T6 and T7 had a better effect on the increase of rice yield.Of which,T5 had the highest yield,up to 6533.32 kg/hm^(2),which increased by 29.97%compared to the CK2.Focused on the soil amendments formulation in the T5 and T6,the two formulations all contained ferric phosphate,humic acid,calcium magnesium phosphate fertilizer,indicating that these substances played an important role in saline-alkali soil improvement.
