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以湖南Cd污染区水稻土为供试土壤,研究了土壤活性Al(Al_(ox))、活性Fe(Fe_(ox))、磷吸持指数(PSI)、吸持饱和度(DPSS)和释放风险指数(ERI)及其相关性关系.结果表明:供试水稻土中Al_(ox)和Fe_(ox)含量变异性较大,分别为55.67~1495.90 mg·kg~(-1)和1.50~13.63 g·kg~(-1),但有效磷含量变化幅度不大.水稻土吸持磷能力较弱,全部样品中PSI均低于30,但水稻土磷的吸持饱和度较低,85%的土壤样品DPSS低于磷淋失临界值(15%),且磷释放失风险(ERI)较小.水稻土中Al_(ox)含量和Fe_(ox)含量与PSI存在显著正相关关系(p<0.05),而与DPSS之间表现为显著负相关关系(p<0.01),DPSS和PSI呈现为显著负相关关系(p<0.01).
The effects of soil active Al (Al_ (ox)), active Fe (Fe_ (ox)), phosphorus adsorption index (PSI), sorption saturation (DPSS) Risk index (ERI) and their correlation.The results showed that the variability of the contents of Al_ (ox) and ox_ (ox) in the paddy soils were large, ranging from 55.67 to 1495.90 mg · kg -1 and 1.50 ~ 13.63 g · kg ~ (-1), but the content of available P did not change much.The paddy soil had a weak ability of absorbing and holding phosphorus, and the PSI of all samples was less than 30, but the phosphorus uptake and saturation of paddy soil was low, 85 % Of soil samples were lower than the critical value of phosphorus leaching (15%) and the risk of phosphorus release (ERI) was lower.The contents of Al and Fe in rice soil were positively correlated with PSI ( p <0.05), while there was a significant negative correlation with DPSS (p <0.01). There was a significant negative correlation between DPSS and PSI (p <0.01).