土壤重金属污染的酶学诊断:紫色土Cd、Cu、Pb和As对水稻根系脱氢酶的影响

Enzymological diagnoses of soil pollution by heavy metals: influence of Cd, Cu, Pb and As in purple soil on dehydrogenase of rice roots.

本文通过酸性紫色土和石灰性紫色土中不同浓度Cd、Cu、Pb、As对水稻根系脱氢酶的影响研究,揭示了脱氢酶受抑制与产生抗性的过程。在低浓度时,土壤Cd、Cu、Pb、As对脱氢酶的影响较敏感,能因元素的不同性质反映土壤类型影响的差别。最后,以脱氢酶受抑制与初始抗性峰出现的转折点相应的土壤浓度为依据,确定了两种紫色土Cd、Cu、Pb、As的临界浓度。

In this paper, the influence of different concentrations of Cd, Cu, Pb and As on dehydrogenase of rice roots in acid purple soil and limy purple soil was studied. It shows that dehydrogenase undergoes the inhibition and produces the resistance under the influence of heavy metals in soil. When the concentrations are relatively low, the influence of Cd, Cu, Pb and As to enzymatic activities can reflect the difference of soil type. Based on the turning point of inhibition and resistance peak of dehydrogenase, critical concentration of Cd, Cu, Pb and As in two kinds of purple soil is defined.