纳米沸石对大白菜镉吸收及土壤有效镉含量的影响郑荧辉熊仕娟

通过大田试验研究了纳米沸石和普通沸石施用量（11250、22500、45000 kg·hm-2）对大白菜产量、品质及镉吸收和土壤全镉及有效镉含量的影响。结果表明，施用纳米沸石和普通沸石显著提高了大白菜产量（鲜重），分别比对照增加了21.3%~35.2%和16.1%~31.8%。普通沸石以45000 kg·hm-2施用量处理产量最高，纳米沸石以22500 kg·hm-2施用量处理产量最高。纳米沸石和普通沸石中低施用量（≤22500 kg·hm-2）提高了大白菜氨基酸、还原糖和Vc含量。纳米沸石和普通沸石分别使大白菜地上部镉含量降低了19.3%~37.4%和9.9%~16.2%，使根部镉含量分别降低了8.1%~27.9%和17.3%~25.4%。施用纳米沸石和普通沸石显著降低了土壤有效镉含量，且降低效果随沸石施用量的增加而增加。纳米沸石和普通沸石施用量与土壤有效镉含量存在极显著负相关关系（r=-0.591，P<0.01），与大白菜地上部和根部镉含量也存在极显著的负相关关系（r=-0.697，-0.766；P<0.01）。与普通沸石相比较，纳米沸石增加大白菜产量、降低大白菜镉含量及土壤有效镉含量的效果更好。

Effect of nano zeolite application amount on Cd up take by Chinese cabbage and soil available Cd content

Field experiments were carried out to investigate the effect of nanozeolite and ordinary zeolite at the amounts of 11 250, 22 500 and 45 000 kg·hm-2 on the yield and cadmium uptake by Chinese cabbage, and available cadmium contents in soil. The results showed that nanozeolite and ordinary zeolite could increase the yield of Chinese cabbage by 21.3%~35.2%and 16.1%~31.8%, respectively. The highest yield of Chinese cabbage was found at nanozeolite application amount of 22 500 kg·hm-2 and ordinary zeolite application amount of 45 000 kg·hm-2, respectively. Nanozeolite and ordinary zeolite(≤22 500 kg·hm-2)increased the contents of amino acids, reducing sugar and Vc in Chinese cabbage. The contents of cadmium in shoots and roots revealed the reduction by 19.3%~37.4%and 9.9%~16.2%after nanozeolite and ordinary zeolite treatments, respectively. The application of nanozeolite and ordinary zeolite significantly reduced available cadmium content in soil in a dose-dependent manner. The application amount of zeolite showed significantly negative relationships with available cadmium content in soil(r=-0.591, P<0.01), and were extremely negatively correlated with cadmium content in shoots and roots of Chinese cabbage(r=-0.697,-0.766;P<0.01). More obvious effects on increasing the yield of Chinese cabbage, and reducing cadmium content in Chi-nese cabbage and available cadmium content in soil were observed during nanozeolite treatments than those during ordinary zeolite treatments.