论文部分内容阅读
通过盆栽试验，作者对杉木、马尾松、银杏、火炬松、中山杉、侧柏和刺槐苗的耐盐能力进行了研究。盐处理水平为４种：ＣＫ（０．０％）、Ａ（０．１％）、Ｂ（０．３％）和Ｃ（０．５％）。测定的指标包括叶片中Ｋ＋、Ｎａ＋的累积量、游离脯氨酸（Ｐｒｏ）和叶绿素含量、超氧歧化酶（ＳＯＤ）活性、水势、存活率。研究结果表明：①随着盐浓度的提高和处理时间的延长，各树种叶片中Ｎａ＋浓度明显上升，但Ｋ＋浓度变化不大。②随着盐浓度的提高和时间的推移，各树种叶片中脯氨酸（Ｐｒｏ）含量均呈上升趋势，而叶绿素含量呈下降趋势。③随着盐分浓度提高及时间的延长，各树种的水势绝对值均呈上升趋势，而ＳＯＤ活性则降低。④盐浓度高低和作用时间长短对７个树种的生长有显著影响。⑤综合评定结果表明，刺槐和银杏抗盐能力较强，侧柏和中山杉抗盐能力中等，杉木、火炬松和马尾松抗盐能力较差。
Through pot experiment, the authors studied the salt tolerance of Chinese fir, Pinus massoniana, Ginkgo biloba, Pinus taeda, Chinese fir, Platycladus orientalis and Robinia pseudoacacia. Salt treatment levels were 4: CK (0.0%), A (0.1%), B (0.3%) and C (0.5%). The indexes of the assay included K +, Na + accumulation, free proline and chlorophyll content, superoxide dismutase (SOD) activity, water potential and survival rate. The results showed that: (1) With the increase of salt concentration and the prolongation of treatment time, the concentration of Na + in leaves of all species increased obviously, but the concentration of K + did not change much. ② With the increase of salt concentration and the passage of time, the contents of proline (Pro) in leaves of all species showed an upward trend while the content of chlorophyll decreased. ③ With the increase of salt concentration and the extension of time, the absolute value of water potential of all species showed an upward trend, while the SOD activity decreased. ④ The level of salt concentration and the duration of action have a significant impact on the growth of seven species. ⑤ Comprehensive assessment results show that Robinia and Gingkoii have strong salt-tolerance ability, moderate salt-tolerance ability of Oriental Arborvitae and Chinese fir, and poor salt-tolerance ability of Chinese fir, Pinus taeda and Pinus massoniana.