<正>以杂交新美柳1年生扦插苗为材料，采用完全随机区组设计，研究NaCl、Na2SO4、NaHCO，、Na2CO3及其混台盐碱胁迫下苗木根系活力的变化，并研究外源一氧化氮（N0）供体亚硝基铁氰化钠（sNP）对100mmol/L盐碱胁迫下苗木根系活力的影响。结果表明：杂交新美柳在Nacl和Na2SO4胁迫下有一定的应激能力，随着胁迫浓度增加，呈先上升后下降趋势；在NaHCO3和Na：c0，胁迫下根系活力呈下降趋势，且均低于对照。在混合盐碱胁迫下，pH为6.89～7.14时，杂交新美柳的根系活力随胁迫浓度增加呈先上升后下降趋势，当pH>8.22时，根系活力随胁迫浓度的增高均呈下降趋势。在单盐胁迫下，sNP处理未起到缓解NaCl胁迫的作用，但对Na2SO4、NaHCO3和Na2CO3胁迫均有一定的缓解作用；在混合盐碱胁迫下，随着pH升高，SNP缓解盐胁迫能力逐渐下降，直至消失。

The bearing capacity and failure form of the joint composed by laminated bamboo lumber and steel bolt were studied by stalic loading experiment. The result showed that the laminated bamboo lumber joint displayed high strength, rigidity and excellent lensility. The main board and bolts of joint failed at the same time. It indicated that the laminated bamboo structure laminate could ensure the effective transmission of shear and showed reliable load resistance integrality.