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1、中国农业科学2009,42(7):2392-2396ScientiaAgriculturaSinicadoi:10.3864/j.issn.0578-1752.2009.07.018黄淮海平原典型潮土的酸碱缓冲性能1,2111,2黄平，张佳宝，朱安宁，张丛志12（中国科学院南京土壤研究所土壤与农业可持续发展国家重点实验室封丘农业生态试验站，南京210008；中国科学院研究生院，北京100049）摘要：【目的】通过对土壤酸碱缓冲容量的研究，可以评价土壤抵抗酸化和碱化的能力，也可以对土壤酸化过程进行预测和调控。【方法】采用酸碱滴定法获取土壤酸碱滴定曲线，并通过分段拟合计算土壤酸碱
2、缓冲容量。【结果】酸滴定曲线和碱滴定曲线在整体上并不呈线性，但分段的酸和碱滴定曲线的线性相关系数均大于0.97。-1通过分段拟合得出土壤酸、碱缓冲容量分别为158.71和25.02mmol·kg。【结论】酸碱滴定法适用于黄淮海平原典型潮土酸碱缓冲容量测定。根据缓冲体系的划分和土壤基本性质可以看出，碳酸盐是最重要的酸缓冲体系，而土壤有机质贡献相对较小。关键词：典型潮土；黄淮海平原；pH缓冲容量AcidandAlkalineBufferingCapacityofTypicalFluvor-AquicSoilinHuang-Huai-HaiPlain1,2111,2HUANGPin
3、g,ZHANGJia-bao,ZHUAn-ning,ZHANGCong-zhi1(StateEnvironmentalStationofAgro-ecosysteminFengqiu,StateKeyLaboratoryofSoilSustainableAgriculture,InstituteofSoil2Science,ChineseAcademyofSciences,Nanjing210008;GraduateSchoolofChineseAcademyofSciences,Beijing100049)Abstract:【Objective】Soilacidandalk
4、alibuffercapacity,asamajorindicatorforevaluatingthevulnerabilityandresistibilitytosoilacidificationandalkalization,isanimportantfactorimpactingthesustainabledevelopmentofagriculturalsoils,throughwhichsoilacidificationprocesscanbepredictedandmodified.【Method】Inthisstudy,titrationcurvemethodw
5、asadoptedtoinvestigatethepHBC,andseparatetitrationcurveswereestablishedbyaddingincrementalamountsofeitherstandardized-1-1hydrochloricacid(HCl)(0.12mol·L)orsodiumhydroxide(NaOH)(0.10mol·L)tosoilsuspendedindeionizedwater(soil﹕solution=1﹕5).SoilpHwasmeasuredafter7dresuspensionandisothermalequi
6、librium(t=25℃).LinearregressionswerefittedtothelinearportionofeachtitrationcurveandtheslopesoftheselineswereusedasthedeterminationofpHBC.【Result】TheresultsshowedthatgreatsignificanceofcorrelationsbetweentheamountsofaddingacidoralkaliandthepHdroporincreasewere2presented,andthecoefficientsofr
7、elativitywerehigherthanthesimilarresearchesonacidsoils(R=0.97).Theslope-derivedpHBC-1-1ofacidandalkaliwere158.71mmol·kgand25.02mmol·kg,respectively.【Conclusion】TitrationtechniquewasapplicableindeterminationofpHBContypicalfluvor-aquicsoilinHuang-Huai-HaiP
