<正>在海岸带滨海盐土上设计并实施了类似于盆栽试验的局部控制地栽耐盐试验,研究海岸带4种盐度梯度下12个杨柳新无性系的耐盐阈值。结果表明:杨柳新无性系的成活率、保存率和生长量随着土壤含盐量的增加而降低,且不同树种、不同无性系在不同生长期的耐盐能力不同;不同时期同一杨柳新无性系的极限耐盐量相差0.06%～0.15%。另外,对树木耐盐试验评价指标体系的建立、树木耐盐阈值表示法、夏季土壤含盐量作为树木耐盐阈值的可行性和近似盆栽的局部控制地栽耐盐试验研究法等进行了论述。

A partly-controlled field experiment was designed and carried on to study the seedling salt-tolerance of twelve new poplar and willow clones,together with four levels of salinity treatment on coastal area.The results showed that high salt content caused the survival rate,conserve rate and biomass of the seedlings to decrease obviously.Two species and twelve clones had different salt-tolerant ability in different growing period.Corresponding to the seedling conserve rate of 50%, the threshold values of the soil salt content of clones were:I-74 poplar clone for 0.26%～0.34%,I-69 poplar clone for 0.24%～0.33%,I-35 poplar clone for 0.18%～0.33%,J35-13 willow clone for 0.10%～0.20%,J30-16 willow clone for 0.10%～0.13%,J4-34 willow clone for 0.09%～0.14%.