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Assisted Natural Remediation of a Trace Element-Contaminated Acid Soil:An Eight-Year Field Study

Pedosphere 2015年第2期25卷 250-262页

作者： Jian XIONG Paula madejon engracia madejon Francisco CABRERA Instituto de Recursos Naturales y Agrobiologia de SevillaIRNAS CSICAvenida Reina Mercedes10P.O.Box 1052Seville 41080 Spain

There are many remediation techniques for organic contaminated soils,but relatively few of them are applicable to trace elementcontaminated soils.A field experiment was carried out to investigate assisted natural remediation(ANR) of an acid soil contaminated by As,Cd,Cu,Zn and Pb using one inorganic amendment,sugar beet lime(SL),and two organic amendments,biosolid compost(BC)and leonardeite(LE).The experiment was arranged in a completely randomized block design with four treatments in three replicates:1) a non-amended control(NA);2) SL amended at 30 Mg ha^(-1) year^(-1);3) BC amended at 30 Mg ha^(-1) year^(-1) and 4) LE amended at 20 Mg ha^(-1) year^(-1) plus SL amended at 10 Mg ha^(-1) year^(-1)(LESL).The amended plots received two doses of each amendment(DO2):one in October 2002 and another in October *** plots were then divided in half into two subpolts and one subplot received another two doses of the same amendments(DO4) in October 2005 and October *** 2011,the pH values of the amended soils were greater than that of the NA soil,with the SL-amended soil showing the highest *** organic carbon(TOC) was also greater in the amended soil,and greater with DO4 than with *** reduced the concentrations of 0.01 mol L^(-1) CaCl_2-extractable Cd,Cu and Zn,especially in the SL-amended *** cover of colonizing vegetation was enhanced by amendments,but was independent of amendment *** in soil properties from 2003 to 2011 showed that the first amendment application of DO2 caused a high differentiation between all the amendment treatments and the NA *** the second application of DO2,soil pH and TOC continued increasing *** two applications of amendments(DO4) caused differences only in the organic *** cover increased over time in all the treatments including *** could be concluded that the slow and steady natural remediation of this soil could be enhanced by amendment application(ANR).

关键词：酸性土壤修复技术微量元素有机污染自然土壤pH值应用程序随机区组设计

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Conservation Tillage Influence on Carbon Dynamics Under Mediterranean Conditions

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Pedosphere 2014年第1期24卷 65-75页

作者： R.LóPEZ-GARRIDO E.madejon F.MORENO J.M.MURILLO Instituto de Recursos Naturales y Agrobiologia de Sevilla(IRNAS-CSIC)

Intensity of tillage practices can enhance organic matter decomposition,increasing CO_2 emissions from soil to the *** tillage(CT)has been proposed as a means of counteracting potential damages to the *** this study the effects of two CT systems,reduced tillage in a long-term experiment(RT_l)and no-tillage in a short-term experiment(NTs),were compared to traditional tillage(TT)in the long(TT_l)and short-term experiments(TTs).CO_2 fluxes,total soil organic carbon(SOC)and dehydrogenase activity(DHA)were evaluated at 0-5,5-10 and 10-15 cm depths throughout the three years studied(Oct.2006-Jul.2009).Traditional tillage increased CO_2 emissions compared to *** CT treatments(RTl and NTs)accumulated more SOC in the surface layer(0-5 cm)than the TT treatments(TT_l and TT_S).SOC accumulation was moderate but DHA consistently increased in CT in the surface soil,especially with a legume crop included in the crop *** of stratification ratio of all parameters studied were higher in the CT treatments(RTl and NTs).The agricultural and environmental benefits derived from CT make this system recommendable for semi-arid Mediterranean rain-fed agriculture.

关键词：保护性耕作地中海碳动态土壤有机碳 CT系统二氧化碳传统耕作雨养农业

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