作　　者： (周钰佩）; (刘慧霞）; (于成）; (林丽果）; (林选栋）;

机构地区： 草地农业生态系统国家重点实验室兰州大学草地农业科技学院,兰州730020

出　　处： 《生态学报》 2017年第16期5514-5521,共8页

摘　　要： 高羊茅(Festuca arundinacea)因长期多频灌溉往往生长在土壤盐渍化或潜在盐渍化的生境中。采用盆栽试验研究了不同盐生境下添加硅对两个高羊茅品种(抗性强的XD和抗性弱的K31)生物量和渗透调节物质的影响。结果表明:不同盐生境均降低了两个不同抗性高羊茅品种K31和XD的地上生物量和地下生物量。添加硅显著增加了盐浓度小于或等于150 mmol/L时XD的地上和地下生物量,以及盐浓度小于或等于100 mmol/L时K31地下生物量,但对K31地上生物量没有显著影响。添加硅显著增加了盐浓度小于或等于150 mmol/L时XD的地下地上生物量比,以及盐浓度100 mmol/L时K31地上地下生物量比。盐生境降低了XD和K31可溶性糖、可溶性蛋白、脯氨酸和丙二醛含量。添加硅没有显著影响XD的渗透调节物质含量,但显著降低了盐浓度大于或等于200 mmol/L时K31的可溶性糖含量,以及盐浓度250 mmol/L时K31的脯氨酸含量。添加硅均显著降低盐浓度大于或等于150 mmol/L时K31和XD的丙二醛含量,但XD的降低幅度大于K31。结果表明,添加硅对盐生境下高羊茅生长有一定的促进作用,但这种促进作用与品种自身抗性密切相关。 Tall fescue （Festuca arundinacea） typically grows in saline soil or potential saline soil because tall fescue turf often needs to be irrigated. A pot experiment was conducted to investigate the effects of silicon （Si） supplements on the biomass and osmolyte content of two tall fescue varieties （XD and K31） at different soil saline levels. The variety XD is strongly resistant to salinity and K31 is weakly resistant. Above-and underground biomass of both varieties tended to decrease as soil salinity increased. Added Si significantly increased the above-and belowground biomass of XD when soil salinity was 150 mmol/L or below and the belowground biomass of K31 when the salinity was 100 mmol/L or below; it did not affect the aboveground biomass of K31. Silicon supplementation significantly increased the root-to-shoot ratio of XD when the salinity was 150 mmol/L or below and that of K31 at a salinity of 100 mmol/L. Salinity reduced the soluble sugar, soluble protein, proline, and malondialdehyde contents of both varieties. Silicon supplementation did not affect the osmolyte contents of XD. It significantly decreased the soluble sugar content of K31 when it was 200 mmol/L or above and proline content of K31 when the salinity was 100 mmol/L. Silicon supplementation significantly decreased the MDA content of both varieties when the salinity was 150 mmol/L or above, but the magnitude of decrease was greater in XD than in K31. These results indicate that silicon supplementation aids in growth of tall fescue in saline soil, and that this benefit is closely related to the biology of the variety.

关 键 词： 盐渍土壤 盐浓度 高羊茅 品种 添加硅 生物量 渗透调节物质含量