盐胁迫对主要造林树种种子活力及幼苗生理特性的影响

在水培条件下进行刺槐（Ｒｏｂｉｎｉａｐｓｅｕｄｏａｃａｃｉａ）、马尾松（Ｐｉｎｕｓｍａｓｏｎｉａｎａ）、水杉（Ｍｅｔａｓｅｑｕｏｉａｇｌｙｐｔｏｓｔｒｏｂｏｉｄｅｓ）种子和幼苗的耐盐性试验。盐浓度为０．０％，０．１％，０．２％，０．３％，同时用２５０×１０－６多效唑（ＭＥＴ）测定预处理种子后的耐盐性。结果表明：盐浓度越大，种子发芽势及发芽率越低，简化苗木活力指数（ＳＶＩＳ）越小；ＭＥＴ对种子发芽势、发芽率及ＳＶＩＳ有抑制作用。但盐浓度越大，种子发芽率、ＳＶＩＳ越大；根茎比随盐浓度的增加而降低，ＭＥＴ有增加根茎比值的趋势；幼苗体内游离脯氨酸含量随盐浓度增加而增加，ＭＥＴ能提高脯氨酸的含量；在试验盐浓度下，刺槐、马尾松耐盐能力为０．２％～０．３％，水杉０．１％～０．２％。在沙培条件下，用２５０×１０－６硼酸，０．３％氯化钙和２５０×１０－６ＭＥＴ处理刺槐、湿地松（Ｐｉｎｕｓｅｌｉｏｔｉｉ）、侧柏（Ｐｌａｔｙｃｌａｄｕｓｏｒｉｅｎｔａｌｉｓ）种子，其耐盐能力增强。其中，氯化钙处理湿地松效果较好；硼酸处理侧柏效果好，ＭＥＴ处理居中。３种处理对刺槐的耐盐能力影响不大。

Salt Conerce Effect on Major Afforestate Plants Seeds Vigor and Tenderseedling Physiology Character

The salt torelance of seeds and seedlings of Robinia pseudoacacia,Pinus massoniana and Metasequoia glyptostroboides were tested in the water culture with the salt concentrations 0.0%,0.1%,0.2% and 0.3%.The salt torelance of the pretreated seeds was tested with 250×10^-6 Multi-effects triazole(MET).The higher the concentration of salt was,the lower the germinating energy(GE),germination rate(GR) and simplify vigor index of seeds(SVIS) were.MET could affect GE,GR and SVIS.The root-stem ratio decreased along with increase of concentration of salt,and tended to increase in the MET treatment.The content of free proline of the seedlings increased along with increase of concentration of salt.MET could raise the content of free proline. In the concentration given,the salt torelance was 0.2% to 0.3% for R. pseudoacacia and P. massoniania,and 0.1% to 0.2% for M. glyptostroboides In the sand culture,the salt torelance of seeds treated with 250×10^-6 boric acid,0.3% CaCl₂,250×10^-6 MET was increased in R. pseudocacia,P. elliottii and Platycladus orientalis,and better effect on both Pinus elliottii in CaCl₂ treatment and Platycladus orientalis in the boric acid treatment,middle on MET,little on R. pseudoacacia in the three treatments.