NaCl胁迫对苜蓿和羊草生长与水分利用的影响  

Effect of NaCl Stress on Growth and Water Use Efficiency of Aneurolepidium Chinense and Medicago sativa L. in Drying Soil

作　　者：侯振安[1] 李品芳[2] 郭世文[2] 冶军[1] 

机构地区：[1]石河子大学新疆作物高产研究中心,石河子832003 [2]中国农业大学资源与环境学院,北京100094

出　　处：《中国农业科学》2002年第7期894-900,共7页Scientia Agricultura Sinica

基　　金：国家自然科学基金资助项目 (3 980 0 110 )

摘　　要：通过室内模拟试验研究了干旱土壤中NaCl胁迫对苜蓿和羊草生长和水分利用的影响。结果表明 ,在干旱土壤中 ,羊草和苜蓿株高、根长、干物质积累量、相对生长率 (RGR)和蒸散量随盐度增加显著降低。羊草生长的临界土壤溶液NaCl浓度为 2 5 3mmol/L ,临界土壤含盐量为 0 .6 0 % ;苜蓿生长的临界土壤溶液NaCl浓度为 115mmol/L ,临界土壤含盐量为 0 .33%。羊草的蒸散水分利用率 (WUEET)、钾钠吸收选择性和运输选择性在NaCl 2 5～ 2 2 5mmol/L(总盐 0 .17%～ 0 .5 3% )时 ,随盐度增加而提高 ;而在高盐条件下 (NaCl 2 75～ 32 5mmol/L ,0 .6 3%～0 .73% ) ,则随盐度的增加明显降低。当盐度超过 12 5mmol/L (总盐 >0 .34% )后 ,苜蓿的蒸散水分利用率(WUEET)随盐度水平的增加显著降低。苜蓿植株的钾钠吸收选择性和运输选择性在不同盐度处理表现不一致。The influences of NaCl stress on growth and water use efficiency of Aneurolepidium chinense and Medicago sativa L. were studied using simulating experiment in drying soil. The results showed that, with salt increasing (NaCl from 25-325 mmol/L), plant height, and length of root, biomass, relative growth rate and Evapotranspiration were reduced greatly in drying soil. The salinity critical value of NaCl concentration in drying soil was 253 mmol/L (total salt content 0.60%) for Aneurolepidium chinense and the value was 115 mmol/L (total salt content 0.33%) for Alfalfa. Water use efficiency and K +, Na + selectivity ratios of Aneurolepidium chinense increased with salinity from 25-225 mmol/L, and then they decreased on high salt level (NaCl 275-325 mmol/L). With salt increasing, Water use efficiency of Medicago sativa L.was decreased dramatically. K +, Na + selectivity ratios of Medicago sativa L. was varied differently with changes of NaCl stress.

关 键 词：NACI胁迫 苜蓿 羊草 生长 水分利用 干旱土壤 

分 类 号：Q945.78[生物学—植物学]