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SCI论文目录 |
柴达木盆地弃耕地成因及其土壤盐渍地球化学特征 |
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出 版 社:壤学报 第41卷第1期 |
发表时间:2004年1月 |
台 站:
海北高寒草甸生态系统定位研究站
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作 者:王启基 王文颖 王发刚 李晓明 杨惠青 |
点 击 率:4830 |
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关 键 字:关键词 柴达木盆地;弃耕地;成因盐渍地球化学特征 |
摘 要:摘 要 柴达木盆地弃耕地土壤pH值一般都在8左右,属于碱性土壤。土壤含盐量较高,其全盐量随着土层深度的增大而减少。0~10cm土层中的含盐量最大,一般在1~45gkg-1之间。弃耕地土壤阳离子主要以K+、Na+、Mg2+、Ca2+为主,各阴离子在三层土体中的含量为Cl->SO2-4>HCO-3>CO2-3。经相关分析表明,弃耕地土壤全盐量与Cl-呈极显著的正相关(p<0 01),其次为Mg2+和Ca2+(p<0 05),而与HCO-3呈负相关;Cl-与Mg2+和Ca2+呈极显著的正相关(p<0 01),与CO2-3和SO2-4呈弱的正相关,而与HCO-3呈负相关;从而进一步说明,柴达木盆地弃耕地土壤为氯化物盐化土。柴达木盆地弃耕地土壤中有机质含量较少,0~30cm土层中有机质平均含量为11 46gkg-1;全氮、全磷的含量极低,全钾的含量较为丰富。示范试验结果分析认为,柴达木盆地荒漠绿洲土地退化及土壤盐碱化的发生与当地自然条件和人为不合理利用等因素有紧密的联系。 |
关 键 字(英文):Keywords QaidamBasin;Desertedfarmland;Causeofformation;Saline geochemicalfeatures |
摘 要(英文):Abstract DesertedfarmlandsintheQaidamBasinaremostlyofalkalisoilwithpHvaluearound8,highinsaltcontent.Saltsconcentratemostlyinthe0~10cmsurfacelayer,rangingwithin1~45gkg-1,anddecreaseincontentwithdepthoftheprofile.CationsinthesoilaredominatedwithK+,Na+,Mg2+andCa2+,whereasanionsareinadecreasingorderofCl->SO2-4>HCO-3>CO2-3intermsofcontentinthe0~10cm,10~20cmand20~30cmsoillayers.Thecorrelationbetweento talsaltandCl-contentispositiveandextremelysignificant(p<0 01),andthatbetweentotalsaltandMg2+,Ca2+contentsignificantlypositive,too(p<0 05),butthatbetweentotalsaltandHCO-3contentnegative,whereas,thecorrelationbetweenCl-andMg2+,Ca2+contentispositiveandextremelysignificant(p<0 01),andthatbetweenCO2-3andSO2-4contentalsosignificantlypositive,butthatbetweenCl-andHCO-3contentnegative.Allthesefindingsfurthersuggestthatthesoilsareheavychloridesalinesoils.Organicmattercontentsofthesoilsarelowaveraging11 46gkg-1inthe0~30cmsoillayer.ThecontentoftotalNandPofthesoilsarealsoverylow,butthesoilsarerichinK.Theresultsobtainedfromexperimentalareaindicatethatdegradationandsalinizationofthesoilsiscloselyrelatedtothelo calnaturalconditionsandirrationalhumanactivitiesintheregion. |
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