重庆地区不同母质发育潴育型水稻土的有效铁锰差异

摘要

To explore the difference of effective iron and manganese in different loggogenic paddy soil in Chongqing,contents of effective iron and manganese in paddy soil developed from alluvium,purple rocks and limestone were determined,and the correlations with pH,OM,total iron and manganese were analyzed as well.Results:contents of effective iron and manganese in paddy soil developed from alluvium, purple rocks and limestone decreased with the depth increasing,and higher in topsoil(0 ~ 20 cm);the contents followed the sequence of alluvial paddy soil> purple paddy soil> limestone paddy soil,with the variation degree of alluvial paddy soil> purple paddy soil> limestone paddy soil.The influence of pH and OM followed the sequences of purple paddy soil > alluvial paddy soil > limestone rock rice paddy soil and limestone paddy soil > alluvial paddy soil > purple paddy soil respectively;the correlations with total iron and manganese were worse.The accompanied relationship was limestone paddy soil > alluvial paddy soil > purple paddy soil;the relative transfer ability was purple paddy soil > alluvial paddy soil >limestone paddy soil.The contents of effective iron and manganese in the three kinds of paddy soils were rich and should be controlled in production.%为了解重庆地区不同母质发育潴育型水稻土的有效铁、锰差异，分层取样测定了冲积物、紫色岩、石灰岩发育的水稻土有效铁、锰含量，分析其与 pH，有机质，全量铁、锰的相关性。结果表明：冲积物、紫色岩、石灰岩发育的水稻土有效铁、锰含量随土壤深度增加而呈降低趋势；有效铁、锰含量均是冲积水稻土＞紫色岩水稻土＞石灰岩水稻土，变异程度均呈冲积水稻土＞紫色岩水稻土＞石灰岩水稻土；有效铁、锰含量受 pH 的影响是紫色岩水稻土＞冲积水稻土＞石灰岩水稻土，受有机质影响是石灰岩水稻土＞冲积水稻土＞紫色岩水稻土；有效铁、锰与全量铁、锰的相关性较差，相伴关系表现为石灰岩水稻土＞冲积水稻土＞紫色岩水稻土；有效铁、锰相对迁移能力为紫色岩水稻土＞冲积水稻土＞石灰岩水稻土。3种母质发育的水稻土中有效铁、锰含量均丰富，在生产中应注意控制。