陕西洛川全新世黑垆土理化特征年龄函数的构建  

Construction of Heilu Soil Chronofunction in the Holocene in Luochuan,Shaanxi Province

作　　者：刘刚[1,2,3] 许文年[1] 蔡崇法[3] 刘普灵[2] 杨明义[2] 张琼[3] 

机构地区：[1]三峡大学三峡库区地质灾害教育部重点实验室 [2]中国科学院水利部水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室 [3]华中农业大学农业部长江中下游耕地保育重点实验室

出　　处：《水土保持研究》2012年第3期24-29,共6页Research of Soil and Water Conservation

基　　金：湖北省教育厅自然科学研究项目(Q20111207;XD20100595);黄土高原土壤侵蚀与旱地农业国家重点实验室基金(10501-1211);中国博士后科学基金(20110491162);三峡大学基金(KJ2009B033)

摘　　要：构建土壤理化特征年龄函数是定量认识土壤发育过程的重要途径,也是建立土壤发育模型的基础。本研究通过对陕西洛川全新世黑垆土剖面土壤理化特征及土壤14 C年龄进行研究,利用线性函数、对数函数和三阶多项式对其进行拟合,从而构建土壤年龄函数。结果表明:利用三阶多项式对土壤黏粒(<0.002mm)、粉粒(0.002～0.02mm)、砂粒(0.02～2mm)与土壤年龄拟合效果最好,其变化趋势表明了黑垆土层的存在;而对数函数的拟合结果较好地反映了土壤有机碳随土壤年龄逐渐减少和pH随土壤年龄逐渐增大的过程;土壤CaCO3含量、Mn/Zr,Fe/Zr,K/Zr,Mg/Zr,Ca/Zr,P/Zr,Na/Zr随土壤年龄变化规律与三阶多项式拟合结果最为相符,其结果较好地反映了CaCO3与各种土壤元素在土壤中的迁移过程。Soil chronofunction is an important way to understand soil developent processes quantificationally, and the foundation for establishment of soil genesis model. To establish soil chronofunction, soil properties and ^14C ages in the Holocene of Heilu soil profile in Luochuan, Shaanxi Province, were studied. Linear, log arithmic, and three order polynomial functions were used to fit the relationships between soil properties and soil ages. The results indicated that three order polynomial function was the best to fit the relationships between clay （〈0. 002 mm）, silt （0. 002-0.02 mm）, sand （0.02-2 mm） and soil ages, and the trend line showed the existence of Heilu soil in the profile. The logarithmic function indicated the variation of soil organic carbon and pH with time perferably. The variation of CaCO3 content, Mn/Zr, Fe/Zr, K/Zr, Mg/Zr, Ca/Zr, P/Zr, and Na/Zr with soil ages could be described best by use of three order polynomial functions, and the trend line showed the migration of CaCO3 and soil elements.

关 键 词：14C年龄 函数 土壤属性 元素迁移 土壤发育 

分 类 号：P534.632[天文地球—第四纪地质学]