摘要
为探讨腐植酸对土壤有机磷组分变化的影响,采用Bowman-Cole土壤有机磷分级方法的改进方法,在不同的培养时期,对加入外源腐植酸的黄壤有机磷组分进行了分析,结果表明:(1)土壤中PO组分的含量受土地利用方式和土层厚度影响较大。PO的含量特征为茶园>旱地>林地,0-20cm土层高于20-40cm土层。PO各组分的相对含量高稳性有机磷(HR-OP)>中稳性有机磷(MR-OP)>中等活性有机磷(ML-OP)>活性有机磷(L-OP),说明PO中易被植物吸收利用的组分相对含量较低;(2)腐植酸的施入增加了土壤L-OP和ML-OP含量。腐植酸的施入对林地、旱地和茶园20-40cm土层中L-OP和ML-OP含量增加的影响显著高于0-20cm土层。对旱地土壤L-OP和林地土壤ML-OP的增效均显著高于其它土壤,尤以腐植酸浓度为8g/kg时效果最为显著;(3)加入外源腐植酸使土壤中MR-OP和HR-OP转化成为活性较高的PO。林地土壤中MR-OP和HR-OP的转化量20-40cm高于0-20cm土层;旱地和茶园土壤中MR-OP的转化量20-40cm高于0-20cm土层,而HR-OP的转化量0-20cm高于20-40cm土层。在0-20cm土层,腐植酸对茶园土壤MR-OP和HR-OP的转化效果最高;在20-40cm土层,腐植酸对茶园土壤MR-OP的转化效果最高,当腐植酸浓度为8g/kg时效果最为显著。
The effects of humic acid on organic phosphorus fractions in different periods after application of humic acid were explored with the improved method of Bowman-Cole method. The results showed that： （1） Land use mode and soil layers had a great influence on organic phosphorus fractions. Characteristics of the organic phosphorus content were tea garden soil 〉dry cropland soil 〉forest soil, it content in 0--20 cm soil layer was higher than that in 20--40 cm soil layer as well. The relative content of organic phosphorus frac- tions were HR--OP 〉MR--OP 〉ML--OP 〉L--OP,and showed that the relative content of some fractions which was easily absorbed by plants in organic phosphorus was low; （2）Application of humic acid increased the content of soil L--OP and ML--OP. The increasing of L--OP and ML--OP of 20--40 cm soil layer was significantly higher than that of 0--20 cm soil layer by application of humic acid in forest, dry cropland and tea garden. The increasing of L--OP in dry cropland soil and ML--OP in forest soil was significantly higher than other soils, especially when the humic acid at a concentration of 8 g/kg was the most significant effect; （3）In the meantime, MR--OP and HR--OP were converted into the organic phosphorus which was higher reactivity. The transform amount of MR--OP and HR--OP of 20--40 cm soil layer were higher than that of 0--20 cm soil layer in forest, the transform amount of MR--OP of 20--40 cm soil layer was higher than that of 0--20 cm soil layer in dry cropland and tea garden, and the transform amount of HR--OP of 0--20 cm soil layer was higher than that of 20--40 cm soil layer; The transformation effect of humic acid on MR--OP and HR--OP of 0--20 cm soil layer in tea garden was most significant, the transformation effect of humic acid on MR--OP of 20--40 cm soil layer in tea garden was most significant, especially when the humic acid at a con-centration of 8 g/kg was the most significant effect.
出处
《水土保持学报》
CSCD
北大核心
2013年第6期249-255,共7页
Journal of Soil and Water Conservation
基金
四川农业大学学科建设双支计划项目(2013)
关键词
腐植酸
有机磷组分
土地利用方式
黄壤
humic acid
organic phosphorus fractions
land use mode
yellow soil
