盐浓度和pH值对地肤(Kochia scoparia(L.)Schral.)种子萌发和幼苗生长的影响

EFFECT OF SAUNITY AND pH VALUE ON GERMINATION AND SEEDLING GROWTH OF Kochia scoparia

地肤种子在NaCl浓度分别为0%,0.5%,1.0%～8.0%及pH值为3～13的条件下进行萌发试验.结果表明,随着NaCl浓度升高,地肤种子萌发率下降.NaCI浓度为2.0%时,种子萌发率为零;在高浓度NaCl溶液中盐渍1个月的种子,再返回清水中,仍能萌发;在清水中萌发的种子放入2.0%～8.0%的盐溶液中后,均不能继续生长;萌发后的地肤种子,在0.5%的NaCl溶液中生长最佳,清水中的次之,其中以pH 4～5和pH8～10时萌发生长最佳.

Germination experiment on Kochia scoparia (L). Schrai. f. trichophylla (Herr.) Schinz. et Thell. was carried out under different concentrations of sodium chloride and variable pH values. The results show a negative corelation between the germination rates and NaCl concentrations. Maximum rate of germination was seen in fresh water and no germination occurred up to 2.0% NaCl. Seeds that had been treated with high concentrations of NaCl for a month, could survive when moved in distilled water. But the higher the concentration of NaCl, the lower the germination rate. Inversely, young seedlings that had germinated in fresh water. when moved into 2.0%～8.0% NaCl could not survive of all these growth trials, the optimum occurred in 0.5% NaCl and poor growth in higher salinities. A wide adaption spectrum of growth between pH values from 3～13 have been observed and two optimum occurred around 4～5 and 8～10.