温度和土壤含水量对青冈栎种子萌发的影响

Influence of temperature and soil moisture on seed germination of Cyclobalanopsis glauca

关键词:  青冈栎  种子萌发  温度  土壤含水量

Key words:  Cyclobalanopsis glauca  seed germination  temperature  soil moisture content

摘要:

运用直播法,研究应用人工气候箱控制温度和土壤含水量对野生青冈栎种子萌发和幼苗生长的影响。结果表明:在12 h光照条件下,青冈栎种子在变温为10℃/15℃时,萌发率很低,仅为(12±12.29)%; 变温为30℃/35℃时,萌发率达最大,为(81±13.7)%。土壤含水量为30%～40%时,萌发率为(79±15.9)%; 土壤含水量为90%～100%时,萌发率为(56.67±19.36)%。青冈栎种子萌发呈现出迅速萌发和推迟萌发的特点; 温度对青冈栎幼苗的苗高、叶长和叶宽影响显著,对幼苗的地径、叶片数量影响不显著。恒温下,不同梯度土壤含水量处理对幼苗的苗高、地径、叶长、宽影响不显著。

Abstract:

In order to explore the influence of temperature and soil moisture on seed germination of Cyclobalanopsis glauca,the direct seeding,controlling the temperature and soil moisture content in the growth cabinet were used. The results were as follows:seeds germination rates of C. glauca were very low with(12±12.29)% at the temperature 10℃/15℃in the 12-hour lighting,and their maximal germination rates was(81±13.7)% at the temperature of 30℃/35℃. Seeds germination rates were(79±15.9)% under soil moisture content about 30%-40%,and(56.67±19.36)% at soil moisture content about 90%-100%. There were rapid germination and delayed germination countermeasures of seed germination for wild C. glauca. It was shown that temperature affected the seedling height,blade length and blade width of C. glauca seedlings significantly. On the contrary,effects on the ground diameter and leaf number of seedlings were insignificant. The different gradient of soil moisture content also affected the seedling height,ground diameter,blade length and blade width insignificant at a constant temperature.