铜胁迫对水花生生长和土壤酶活性的影响

EFFECTS OF COPPER POLLUTION ON GROWTH OF ALTERNANTHERA PHILOXEROIDES AND ACTIVITY OF SOIL ENZYMES

通过盆栽实验,研究了不同浓度铜胁迫对外来杂草水花生(Alternanthera philoxeroides)植株生长、叶绿素含量、生物量及土壤酶活性的影响。结果表明,铜胁迫条件下,水花生植株地上部分高度、生物量、最长根长、平均根长、平均根数、叶绿素a和叶绿素b含量均表现出在低铜浓度下升高,而在高浓度下降低的现象;土壤中脲酶、蔗糖酶、过氧化氢酶和多酚氧化酶活性均随着铜浓度增加均逐渐减小,与铜浓度有高度相关性。4种土壤酶对铜污染的敏感性表现为:蔗糖酶>过氧化氢酶>脲酶>磷酸酶。水花生生长及土壤酶活性可作为检测土壤中重金属铜污染程度的参考指标之一。

A pot experiment was carried out to study effects of Cu stress on growth of Alternanthera philoxeroides, content of chlorophyll, biomass of the plant, and activity of four species of soil enzymes（Invertase, Catalase, Urease and Phosphatase）. Results show that Cu pollution retarded growth of the plant, and reduced its average plant height, and contents of chlorophyll a and chlorophyll b. With increasing Cu content, activity of the soil enzymes decreased. The activity of the four species of soil enzymes was closely related to concentration of Cu, and hence could be used as indicator of the degree of Cu pollution in soil. In terms of sensitivity to Cu stress, the four species of soil enzymes were in the order of Invertase 〉 Catalase 〉 Urease 〉 Phosphatase.