水溶性有机物在水旱轮作土壤剖面中的分馏现象

摘要/Abstract

摘要： 水溶性有机物(DOM)是有机物质中最为活跃的组成部分,在陆地生态系统物质的迁移转化过程中起重要作用.通过田间试验和室内理化分析证明了DOM在土壤剖面迁移过程中存在明显的"分馏"现象,随着土层深度的增加,对照、施化肥和施污泥处理土壤DOM的浓度分别由14.8、117.7和114.8 mg·kg^-1降到21.75、23.23和13.78 mg·kg^-1;不施肥和施化肥处理的土壤DOM随着深度的增加,极性物质所占的比例分别由19.01%和18.47%增至34.97%与44.37%,呈上升趋势,而非极性组分所占比例相应降低;施污泥处理则出现相反的规律,极性组分由36.96%降到17.07%,非极性组分由63.04%增为82.93%.土壤DOM的生物降解率由上到下对照和施化肥处理分别由24.38%和24.00%增大到54.74%和53.81%,而施污泥处理的变化规律则相反,由53.19%降到30.75%.DOM的生物降解率与DOM中极性物质的含量呈正相关关系.紫外光谱进一步证实了这一结果.

关键词: 水旱轮作, 土壤水溶性有机物, 亲水性, 生物降解, 纵向分馏

Abstract: Dissolved organic matter (DOM) is the most active component of organic matters,and plays an important role in the translocation and transformation of pollutants and nutrients in terrestrial ecosystem.In this paper,the vertical fractionation of DOM in a yellow brown soil under water-dry cultivation was investigated by field experiment and physico-chemical analyses.The results showed that in treatments CK,chemical fertilizer and sewage sludge,the DOM concentration decreased from 145.8,117.7 and 114.8 mg穔g^-1 to 21.57,23.23 and 13.78 mg穔g^-1 with soil depth,respectively.In control and fertilizer-treated soils,the hydrophilic fraction of DOM was increased respectively from 19.01% and 18.47% to 34.97% and 44.37% with soil depth,and the biodegradable rate of DOM also increased with soil depth.In sludge-treated soil,a reverse tendency was found for the concentration of hydrophilic DOM and its biodegradable rate.Hydrophilic fraction decreased from 36.96% to 17.07%,the increase of hydrophobic fraction was from 63.04% to 82.93%,and the biodegradable rate decreased from 53.19% to 30.75% with soil depth.The biodegradable rate of DOM was positively correlated to the hydrophilic fraction of DOM,and UV spectra analysis also suggested this.

Key words: Arable soil, Dissolved organic matter, Hydrophilic, Biodegradable, Vertical fractionation

中图分类号:

X172

占新华, 崔春红, 卢燕宇, 周立祥. 水溶性有机物在水旱轮作土壤剖面中的分馏现象[J]. 应用生态学报, 2004, (6): 1025-1029.

ZHAN Xinhua, CUI Chunhong, LU Yanyu, ZHOU Lixiang. Vertical fractionation of dissolved organic matter in soil profile under water-dry cultivation[J]. Chinese Journal of Applied Ecology, 2004, (6): 1025-1029.

参考文献

[1] Allard B.1991.Humic Substances in the Aquatic and Terrestrial Environment.New York:Springer-Verlag.
[2] Allison AM,Philip MG.2001.Enhanced concentrations of PAHs in groundwater at a coal tar site.Environ Sci Technol,35:1320～1328
[3] Barriuso E,Baer U,Calvet R.1992.Dissolved organic matter and adsorption-desorption of dimefuron,atrazine,and carbetamide by soils.J Environ Qual,21:359～367
[4] Charles FH,Swartz CH,Badruzzaman ABM,et al.2002.Arsenic mobility and groundwater extraction in Bangladesh.Science,298:1602～1606
[5] Charles SHJ,Vallino JJ,Nolin A.2002.Decomposition of dissolved organic matter from the continental margin.Deep-sea Res Ⅱ,49:4461～4478
[6] Chefetz B,Hadar Y,Chen Y.1998.Dissolved organic carbon fractions formed during composting of municipal solid waste:Properties and significance.Acta Hydrochim Hydrobiol,26(3):172～179
[7] Dilling J,Klaus K.2002.Estimation of the hydrophobic fraction of dissolved organic matter in water samples using UV photometry.Water Res,36:5037～5044
[8] Guggenberger G,Glaser B,Zech W.1994.Heavy metal binding by hydrophobic and hydrophilic dissolved organic carbon fractions in a spodosol A and B horizon.Water Air Soil Pollu,72:111～127
[9] Jardine PM,Weber NL,McCarthy JF.1989.Mechanisms of dissolved carbon adsorption on soil.Soil Sci Soc Am J,53:1378～1385
[10] Jiang M-G(蒋木庚),Yang H(杨红).1996.Organic Analyses.Nanjing:Nanjing Agricultural University.152～162(in Chinese)
[11] Kalbitz K.2001.Properties of organic matter in soil solution in a German fen area as dependent on land use and depth.Geoderma,104:203～214
[12] Kalbitz K,Solinger S,Park JH,et al.2000.Controls on the dynamics of dissolved organic matter in soils.Soil Sci,165(4):277～304
[13] Kalbitz K,Wennrich R.1998.Mobilization of heavy metals and arsenic in polluted wetland soils and its dependence on dissolved organic matter.Sci Total Environ,209:27～39
[14] Kastelan MM,Petrovic M.1995.Competitive sorption of phosphate and marine humic substances on suspended particulate matter.Water Sci Technol,32(9～10):349～355
[15] Liu Z-P(刘兆平),Sun H(孙华).1995.Study on the condition of acid rain in spring Pukou,Nanjing.Environ Pollu Control(环境污染与防治),17(6):5～9(in Chinese)
[16] Madhun YA,Young JL,Freed VH.1986.Binding of herbicides by water soluble organic materials form soil.J Environ Qual,15:64～68
[17] Magee BR,Lion LW,Lemiey AT.1991.Transport of dissolved organic macromolecules and their effect on the transport of phenanthrene in porous media.Environ Sci Technol,25(2):323～331
[18] McCarthy JF,Williams TM,Liang LY,et al.1993.Mobility of natural organic matter in a sandy aquifer.Environ Sci Technol,27:667～676
[19] Ohno T,Erich MS.1997.Inhibitory effects of crop residue-derived organic ligands on phosphate adsorption kinetics.J Environ Qual,26:889～895
[20] Park JH,Kalbitz K,Matzner E.2002.Resource control on the production of dissolved organic carbon and nitrogen in a deciduous forest floor.Soil Biol Biochem,34:813～822
[21] Pettine M,Capri S,Manganelli M,et al.2001.The dynamics of DOM in the Northern Adriatic Sea.Estur Coast Shelf Sci,52:471～489
[22] Sun L,Perdue EM,Meyer JL,et al.1997.Use of elemental composition to predict bioavailability of dissolved organic matter in a Georgia river.Limnol Oceanogr,42(4):714～721
[23] Yang X-J(杨学军),Li W-H(厉婉华),Jiang Z-L(姜志林).1996.The analyses of simulated acid rain's influences on yellow brown soil in Nanjing.J Jiangsu For Sci Technol(江苏林业科技),23(4):11～17(in Chinese)
[24] Zhan X-H(占新华),Zhou L-X(周立祥),Shen Q-R(沈其荣),et al.2001.The spectroscopic changes characterizations of dissolved organic matter during composting sludge.Acta Sci Circ(环境科学学报),21(4):470～474(in Chinese)
[25] Zhang J-S(张甲绅),Tao S(陶澍),Cao J(曹军).2001.Spatial distribution pattern of water soluble organic carbon in eastern China.Acta Pedol Sin(土壤学报),38(3):308～312(in Chinese)
[26] Zhou LX,Wong JWC.2001.Effect of dissoved organic matter from sludge and sludge compost on soil copper sorption.J Environ Qual,30:878～883
[27] Zhu B,Alva AK.1993.Trace mental and cation transport in a sandy soil with arious amendments.Soil Sci Soc Am J,57:723～727
[28] Zslnay A,Piccolo A.1996.Dissolved humus in soil water.In:Humic Substances in Terrestrial Ecosystem.Netherland:Elsevier Science B V.185～190