钇胁迫对土壤理化性质的影响

Effect of Yttrium Stress on Physical and Chemical Properties of Soil

通过室内培养实验,研究不同浓度的稀土元素Y胁迫对土壤p H值、有效P,速效K,碱解N及有机质等理化性质的影响。结果表明:在低浓度的情况下,Y对有效P的影响不明显,在高浓度下表现为抑制作用,起抑制作用的临界浓度为1000 mg·kg^(-1);当Y浓度大于500mg·kg^(-1)时,碱解N随土壤中Y含量的递增而显著升高,表现出明显的正相关性。对于土壤速效K,Y对其的作用表现为低浓度促进,高浓度抑制。此外,实验结果还表明土壤中Y含量与p H值和有机质有极显著的负相关性。最后,通过对土壤因子交互相关分析发现,土壤p H,有效P,碱解N和有机质之间有较强的相关性。

The effects of Yttrium stress of different concentrations on the properties of soil p H,available phosphorus,available potassium,alkali solution nitrogen and organic matter were studied by laboratory experiments. The results showed that the effect of Yttrium on available phosphorus was not apparent at low concentrations,while it was on the contrary at high concentrations,and the critical concentration of the inhibitory action of available phosphorus was 1000 mg·kg-1. When the concentration of yttrium was higher than 500 mg·kg-1,and the contents of soil alkali solution nitrogen significantly increased with the increasing of yttrium,which showed that the contents of soil alkali solution nitrogen had evident positive correlation with yttrium in the soil,and the low concentration of yttrium promoted the content of soil available potassium and high concentration inhibited its content. Moreover,the results also showed that the content of yttrium in soil was negatively correlated with the p H value and organic matter. The autocorrelation characteristic of different soil properties analysis found that there were strong correlations between soil pH,available phosphorus,available nitrogen and organic matter.