Abstract:

In order to provide theoretical basis for extension in arid area and seedling regeneration in plantation of Picea mongolica that as one of the first choice for afforestation in sandy area, the author produced experimental study about germination mechanism of seeds of Picea mongolica. Seed germination characteristics of Picea mongolica were examined from aspects including temperature, seed-covered sand thickness, NaCl stress, seed imbibitions and treating methods. The results indicated that: (1) The optimal temperature for the seeds to germinate was 15~25℃. The temperature was lower 5℃, the seeds could not germinate, and the germination rate was higher when the temperature was over 35℃, but seedling length had been strongly bad influenced; (2) Salt tolerance of seed was lower, when the NaCl solution density exceeded 0.6％, germination rate would decreased; (3) At the start of imbibitions, the water content of seed increased fast, and relative amount decreased gradually with the time passed, at a certain time, the water content of seed was stable; (4) The optimal seed-covered sand thickness was 0.5-0.75 cm, but when the seed-covered sand thickness was more than 1 cm seedling emergence from the seeds was inhibited; (5) Seed of Picea mongolica was planted after three methods disposed, the result showed that germination rate of stratification treatment on the seed germination was most, water treatment was medium, and 60℃ water treatment was weak. In a word, the artificial breeding was suitable by dealing with sand on seeds, temperature in 15-25℃ and salinity of soil less than 0.6%, without covering soil and rather covering thick soil both went against for germination of seeds of Picea mongolica.Keywords: Picea mongolica; temperature; salt tolerance; germination