重庆地区中性紫色土酸化特征  

The Acidification Characteristics of Neutral Purple Soil in Chongqing District

作　　者：李忠意[1] 程永毅[1] 杨剑虹[1] 

机构地区：[1]西南大学资源环境学院,重庆400716

出　　处：《水土保持学报》2012年第6期234-237,242,共5页Journal of Soil and Water Conservation

摘　　要：为研究重庆地区中性紫色土的酸化特征,按土壤发育层次采集19个已酸化的中性紫色土剖面进行分析研究。结果表明:重庆地区的中性紫色土已经出现了一定程度酸化,酸化程度为耕作层>心土层>底土层,但受地形地貌、种植方式、耕作管理方式等的影响,各土样的酸化程度很不一致。酸化使土壤的交换性K+含量增加,交换性Ca2+、交换性Mg2+含量降低,盐基总量减少,盐基饱和度降低。酸化对土壤的有机质、全N、全P、全K、有效N、有效P的影响不显著,但酸化加速了土壤矿物的分解,使钾的有效态含量显著增加。不合理的耕作方式和氮肥、磷肥的大量施用可能是土壤酸化的主要原因。The object of this study was to research the characteristics of neutral purple soil（NPS） which had acidified in Chongqing district.There were 19 soil profile samples which were collected to analyze.The results showed that that： NPS in Chongqing district had acidified in some extent,the acidification degree was arable layer〉subsoil layer〉 bottom layer,but not same in different area because of the geographic and geomorphic conditions,planting patterns,farm management ways.Soil acidification made the exchangeable K＋ content increase,but the content of exchangeable Ca2＋,exchangeable Mg2＋,base exchange capacity,base saturation percentage decreased.Soil acidification didn＇t have significant influence on organic matter,total nitrogen,total phosphor,total potassium,available nitrogen and available phosphor,but enhanced the decomposition of soil minerals,made the content of available potassium increase significantly.The main reasons of NPS acidification were improper farm management ways,the usage of nitrogenous and phosphorus fertilizer in large scale.

关 键 词：重庆 中性紫色土 酸化 

分 类 号：S153.4[农业科学—土壤学] S158.2[农业科学—农业基础科学]