[1] Baaru M W, Mungendi D N, Bationo A et al., 2007.Soil microbial biomass carbon and nitrogen as influenced by organic and inorganic inputs at Kabete, Kenya.In:Bationo A et al.(eds.).Advances in Integrated Soil Fertility Management in sub-Sa-haran Africa:Challenges and Opportunities.Dordrecht:Springer Netherlands, 827-832.
[2] Bai L Y, Zeng X B, Li L F et al., 2010.Effects of land use on heavy metal accumulation in soils and sources analysis.Agri-cultural Sciences in China, 9(11):1650-1658.doi:10.1016/S 1671-2927(09)60262-5
[3] Banks M K, Schwab A P, Henderson C, 2006.Leaching and re-duction of chromium in soil as affected by soil organic content and plants.Chemosphere, 62(2):255-264.doi: 10.1016/j.chemosphere.2005.05.020
[4] Bradl H B, 2004.Adsorption of heavy metal ions on soils and soils constituents.Journal of Colloid & Interface Science, 277(1):1-18.doi: 10.1016/j.jcis.2004.04.005
[5] Cambier P, Pot V, Mercier V et al., 2014.Impact of long-term organic residue recycling in agriculture on soil solution compo-sition and trace metal leaching in soils.Science of The Total En-vironment, 499:560-573.doi: 10.1016/j.scitotenv.2014.06.105
[6] Cao H, Chen J, Zhang J et al., 2010.Heavy metals in rice and garden vegetables and their potential health risks to inhabitants in the vicinity of an industrial zone in Jiangsu, China.Journal of Environmental Sciences, 22(11):1792-1799.doi: 10.1016/S1001-0742(09)60321-1
[7] Chuan M C, Shu G Y, Liu J C, 1996.Solubility of heavy metals in a contaminated soil:Effects of redox potential and pH.Water, Air, and Soil Pollution, 90(3-4):543-556.doi:10.1007/BF 00282668
[8] Cristaldi A, Conti G O, Jho E H et al., 2017.Phytoremediation of contaminated soils by heavy metals and PAHs.A brief review.Environmental Technology & Innovation, 8:309-326.doi: 10.1016/j.eti.2017.08.002
[9] Diagboya P N, Oluowolabi B I, Adebowale K O, 2015.Effects of time, soil organic matter, and iron oxides on the relative reten-tion and redistribution of lead, cadmium, and copper on soils.Environmental Science and Pollution Research, 22(13):10331-10339.doi: 10.1007/s11356-015-4241-0
[10] Essington M, 2003.Soil and water Chemistry:An integrative Approach.Florida,USA:CRC Press.
[11] Georgiev P, Groudev S, Spasova I et al., 2014.Ecotoxicological characteristic of a soil polluted by radioactive elements and heavy metals before and after its bioremediation.Journal of Geochemical Exploration, 142:122-129.doi: 10.1016/j.gexplo.2014.02.024
[12] Gu Y G, Li Q S, Fang J H et al., 2014.Identification of heavy metal sources in the reclaimed farmland soils of the pearl river estuary in China using a multivariate geostatistical approach.Ecotoxicology and Environmental Safety, 105(1):7-12.doi: 10.1016/j.ecoenv.2014.04.003
[13] Guo J, Kang Y, Feng Y, 2017.Bioassessment of heavy metal tox-icity and enhancement of heavy metal removal by sul-fate-reducing bacteria in the presence of zero valent iron.Journal of Environment Management, 203(Pt1):278-285.doi: 10.1016/j.jenvman.2017.07.075
[14] Guo J H, Liu X J, Zhang Y et al., 2010.Significant acidification in major Chinese croplands.Science, 327(5968):1008-1010.doi: 10.1126/science.1182570
[15] Ho E S, Mauk J L, 1996.Relationship between organic matter and copper mineralization in the Proterozoic Nonesuch Formation, northern Michigan.Ore Geology Reviews, 11(1-3):71-87.doi: 10.1016/0169-1368(95)00016-X
[16] Jackson L J, Kalff J.Rasnnussen J B, 1993.Sediment pH and redox potential affect the bioavailability of Al, Cu.Canadian Journal of Fisheries and Aquatic Sciences, 50(1):143-148.doi: 10.1139/f93-016
[17] Jin Z, Li Z, Li Q et al., 2014.Canonical correspondence analysis of soil heavy metal pollution, microflora and enzyme activities in the Pb-Zn mine tailing dam collapse area of Sidi village, SW China.Environmental Earth Sciences, 73(1):267-274.doi: 10.1007/s12665-014-3421-4
[18] Kaiser K, Zech W, 1997.Natural organic matter sorption on dif-ferent mineral surfaces studied by DRIFT spectroscopy.Sci-ences of Soils.1997.
[19] Karlsson T, Persson P, Skyllberg U, 2006.Complexation of cop-per(Ⅱ) in organic soils and in dissolved organic matter-EXAFS evidence for chelate ring structures.Environment Science Technoogy, 40(8):2623-2628.doi: 10.1021/es052211f
[20] Kelepertzis E, 2014.Accumulation of heavy metals in agricultural soils of Mediterranean:Insights from Argolida basin, Pelo-ponnese, Greece.Geoderma, 221(27):82-90.doi: 1016/j.geoderma.2014.01.007
[21] Khan K, Lu Y, Khan H et al., 2013.Heavy metals in agricultural soils and crops and their health risks in Swat District, northern Pakistan.Food & Chemical Toxicology, 58(7):449-458.doi: 10.1016/j.fct.2013.05.014
[22] Li X, Feng L, 2012.Multivariate and geostatistical analyzes of metals in urban soil of Weinan industrial areas, Northwest of China.Atmospheric Environment, 47(47):58-65.doi: 10.1016/j.atmosenv.2011.11.041
[23] Liu P, Zhao H J, Wang L L et al., 2011.Analysis of heavy metal sources for vegetable soils from Shandong Province, China.Agricultural Sciences in China, 10(1):109-119.doi: 10.1016/S1671-2927(11)60313-1
[24] Liu Y, Xiao T, Ning Z, et al., 2013.High cadmium concentration in soil in the Three Gorges region:geogenic source and potential bioavailability.Applied Geochemistry, 37(1):149-156.doi: 10.1016/j.apgeochem.2013.07.022
[25] Luo H W, Yin X, Jubb A M et al., 2017.Photochemical reactions between mercury (Hg) and dissolved organic matter decrease Hg bioavailability and methylation.Environment Pollution, 220(B):1359-1365.doi: 10.1016/j.envpol.2016.10.099
[26] Lv J, Liu Y, Zhang Z et al., 2014.Multivariate geostatistical analyses of heavy metals in soils:spatial multi-scale variations in Wulian, Eastern China.Ecotoxicology & Environmental Safety, 107(9):140-147.doi: 10.1016/j.ecoenv.2014.05.019
[27] Mortvedt J J, 1995.Heavy metal contaminants in inorganic and organic fertilizers.Fertilizer Research, 43(1-3):55-61.doi: 10.1007/bf00747683.
[28] Ravichandran M, 2004.Interactions between mercury and dis-solved organic matter-a review.Chemosphere, 55(3):319-331.doi: 10.1016/j.chemosphere.2003.11.011
[29] Rodríguez Martín J A, Ramos-Miras J J, Boluda R et al., 2013.Spatial relations of heavy metals in arable and greenhouse soils of a Mediterranean environment region (Spain).Geoderma, 200(6):180-188.doi: 10.1016/j.geoderma.2013.02.014
[30] Sastre J, Rauret G, Vidal M, 2007.Sorption-desorption tests to assess the risk derived from metal contamination in mineral and organic soils.Environment International, 33(2):246-256.doi: 0.1016/j.envint.2006.09.017
[31] Seshadri B, Bolan N S, Wijesekara H et al., 2016.Phospho-rus-cadmium interactions in paddy soils.Geoderma, 270:43-59.doi: 10.1016/j.geoderma.2015.11.029
[32] Shahriary E, Palmer M W, Tongway D J et al., 2012.Plant species composition and soil characteristics around Iranian piospheres.Journal of Arid Environments, 82(82):106-114.doi: 10.1016/j.jaridenv.2012.02.004
[33] Shukla U C, 1971.Organic matter and zinc availability in soils.Geoderma, 6(4), 309-314.doi: 10.1016/0016-7061(71)90060-7
[34] Sinwar P, Mehta S C, Grewal K S et al., 2011.Influence of organic matter on retention and release of lead in a semi-arid soil from India.Haryanaagronomists Org, 27(1-2):1-4.
[35] Srinivasan M, Bhatia S, Shenoy K, 2015.Vegetation-environment relationships in a South Asian tropical montane grassland ecosystem:Restoration implications.Trophic Ecology, 56(2):201-217.
[36] State Environmental Protection Administration, People's Republic of China, 2004.The Technical Specification for Soil Envi-ronmental Monitoring (HJ/T 166-2004).Beijing:China Envi-ronmental Science Press. (in Chinese)
[37] State Environmental Protection Administration, People's Republic of China, 2006.Environmental Quality Evaluation Standard for Farmland Of Greenhouse Vegetables Production (HJ 333-2006).Beijing:China Environmental Science Press. (in Chinese)
[38] Wångstrand H, Eriksson J, Öborn I, 2007.Cadmium concentration in winter wheat as affected by nitrogen fertilization.European Journal of Agronomy, 26(3):209-214.doi: 10.1016/j.eja.2006.09.010
[39] Wang F L, Huang P M, 2001.Effects of organic matter on the rate of potassium adsorption by soils.Canadian Journal of Soil Science, 81(3):325-330.doi: 10.4141/S00-069
[40] Wang L F, Bai Y X,Gai S N, 2011.Single-factor and nemerow multi-factor index to assess heavy metals contamination in soils on railway side of Harbin-Suifenhe railway in Northeastern China.Applied Mechanics & Materials, 71-78(6637):3033-3036.doi: 10.4028/www.scientific.net/AMM.71-78.3033
[41] Wang S, Gao B, Li Y et al., 2017.Adsorptive removal of arsenate from aqueous solutions by biochar supported zero-valent iron nanocomposite:Batch and continuous flow tests.Journal of Hazardous Materials, 322(PtA):172-181.doi: 10.1016/j.jhazmat.2016.01.052
[42] Wang S S, Gao B, Li Y C et al., 2015a.Manganese oxide-modified biochars:Preparation, characterization, and sorption of arsenate and lead.Bioresource Technology, 181:13-17.doi: 10.1016/j.biortech.2015.01.044
[43] Wang S S, Gao B, Zimmerman A R et al., 2015b.Removal of arsenic by magnetic biochar prepared from pinewood and nat-ural hematite.Bioresource Technology, 175:391-395.doi: 0.1016/j.biortech.2014.10.104
[44] Werkenthin M, Kluge B, Wessolek G, 2014.Metals in European roadside soils and soil solution-A review.Environ.Pollut., 189(12):98-110.doi: 10.1016/j.envpol.2014.02.025
[45] Xia X, Yang Z, Cui Y et al., 2014.Soil heavy metal concentrations and their typical input and output fluxes on the southern Song-nen Plain, Heilongjiang Province, China.Journal of Geochemical Exploration, 139(1):85-96.doi: 0.1016/j.gexplo.2013.06.008
[46] Xiao L, Guan D, Peart M R et al., 2017.The influence of bioa-vailable heavy metals and microbial parameters of soil on the metal accumulation in rice grain.Chemosphere, 185:868-878.doi: 0.1016/j.chemosphere.2017.07.096
[47] Yang L, Huang B, Hu W et al., 2013.Assessment and source identification of trace metals in the soils of greenhouse vegetable production in eastern China.Ecotoxicology and Environmental Safety, 97(11):204-209.doi: 10.1016/j.ecoenv.2013.08.002
[48] Yu W, Ding X, Xue S et al., 2013.Effects of organic-matter ap-plication on phosphorus adsorption of three soil parent materi-als.Journal of Soil Science & Plant Nutrition, 13(4):1003-1017.doi: 10.4067/S0718-95162013005000079
[49] Zeng X B, Li L F, Mei X R, 2008.Heavy metal content in Chinese vegetable plantation land soils and related source analysis.Journal of Integrative Agriculture, 7(9):1115-1126.doi: 10.1016/S1671-2927(08)60154-6
[50] Zhang H Z, Li H, Wang Z, Zhou L D, 2011.Accumulation char-acteristics of copper and cadmium in greenhouse vegetable soils in Tongzhou district of Beijing.Procedia Environmental Sciences, 10(1):289-294.doi: 10.1016/j.proenv.2011.09.047