不同钠浓度对白三叶草和多年生黑麦草生长的影响

白三叶草对Na 的反应比多年生黑麦草敏感.培养液中的Na 浓度从0.1mmol/L 增至0.5mmol/L 时,其干物质生产下降37%;增至2.5mmol/L 时,干重下降49%,而多年生黑麦草的干重仅降低6%.2种牧草的Na 含量均随培养液Na 浓度的增加而提高,K 含量未受影响.白三叶草的Na 含量低于多年生黑麦草,而K 含量高于多年生黑麦草.试验结果暗示,白三叶草对K 的选择吸收能力较多年生黑麦草强,但耐盐能力较差,生态适应性不如多年生黑麦草广.

GROWTH OF WHITE CLOVER AND PERENNIAL RYEGRASS AS AFFECTED BY INCREASING NaCl CONCENTRATIONS

White clover showed more sensitive response to Na treatments than perennialryegrass.Increasing Na concentration in solutionfrom 0.1mmol/L upto 2.5mmol/L resultedin a dry weight reduction of white Clover by 49%.However,only slight decrease of dry mat-ter production(6%)was observed for perennial ryegrass.Although Na content in the twospecies increased with increasing Na supply,K content was not influenced by Na treatments.The results imply that white clover has stronger ability in selective K absorption but lowersalt toleyance than perennial ryegrass,so its ecological adaptability is not as wide as that ofperennial ryegrass.