紫色土壤风化发育程度与“钛值”关系的研究
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国家科技支撑计划课题(编号:2007BAD87B10)、西南大学生态学重点学科“211工程”建设经费资助


Weathering degree of purple soil and “titanium value”
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    摘要:

    在重庆地区按紫色土壤习惯命名采集各主要紫色地层母岩发育的54个土壤剖面样品,并进行全钛和无定形钛含量测定。结果表明:供试紫色土全钛含量范围为TiO2 2.70~23.9 g kg-1,平均值7.52±3.90 g kg-1;土壤全钛含量高低主要与成土紫色母岩有关,而受土壤风化发育程度的影响不大,在剖面中分布规律不明显;用土壤“钛值”(全钛/无定形钛)比较,各紫色地层母岩初期风化发育的土壤(如石骨子土)钛值大小与母岩基本保持一致,表现为:三叠系飞仙关组(T1f)>侏罗系蓬莱镇(J3p)>侏罗系自流井组(J1—2z)>侏罗系沙溪庙组(J2s)>侏罗系遂宁组(J3s)>白垩系夹关组(K2j);但随土壤风化发育程度加深,钛值显著降低,且钛值大小顺序与土壤硅铝铁率所描述的土壤风化发育程度结果基本吻合,二者达极显著相关( r = -0.809 1** ),如果将紫色土壤钛值大小划分为Ⅰ~Ⅶ级,则可将不同风化发育度的紫色土壤归入相应的级别中,据此,可按级别对紫色土壤的风化发育程度做出描述.

    Abstract:

    A total of 54 profiles of soils derived from various main purple strata were collected according to the nomenclature of purplish soil in Chongqing area for analysis of total titanium and amorphous titanium. Results show that total titanium (TiO2) varied in the range of 2.70 g kg-1to 23.9 g kg-1 in content, averaging 7.52±3.90 g kg-1. The content of soil total titanium was closely related to parent rock of the soil, while it was little affected by weathering degree of the soil, and its distribution did not have any set rule to follow Comparison in titanium value (ratio of total Ti/ amorphous Ti) between the soils at their initial weathering stage and their parent rocks showed little difference, following a decreasing order of Trias T1f > Jurassic J3p > Jurassic J1—2z> Jurassic J2s > Jurassic J3s > Cretaceous K2j Titanium value decreased remarkably with rising weathering degree and varied in coincidence with the description of weathering degree based on value of SiO2/(Al2O3+Fe2O3). The correlation coefficient between the two reaches a significant level ( r = -0.809 1 * * ). If the titanium values are divided into seven grades, fromⅠ to Ⅶ, purplish soils different in weathering degree can be sorted into their respective grades. Thus grades of titanium value can be used to describe weathering degree of purplish soils.

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胡艳燕,谢德体,杨剑虹.紫色土壤风化发育程度与“钛值”关系的研究[J].土壤学报,2009,46(6):973-981. DOI:10.11766/trxb200811250602 Hu Yanyan, Xie Deti, Yang Jianhong. Weathering degree of purple soil and “titanium value”[J]. Acta Pedologica Sinica,2009,46(6):973-981.

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