摘要
利用从美国引进的无刺美国皂荚种子培育实生苗,并对无刺美国皂荚的实生苗在北京地区的适应性进行了研究。研究结果表明:(1)无刺美国皂荚种子利用初始温度为100℃的水浸种,能够很好的破坏种子本身坚硬的种皮,促进种子萌发。(2)无刺美国皂荚的实生苗能够适应北京的气候,正常度过寒冬及干旱多风的春季,表现了较好的抗寒性及耐旱性。(3)对无刺美国皂荚在七月的光合特性测定表明:叶片净光合速率的日变化呈"单峰"曲线,一天中净光合速率的变化主要受气孔的调节。蒸腾速率的日变化曲线也为"单峰"曲线,中午12时达到最大值,蒸腾速率与气孔导度及大气水汽压差相关性极显著。叶片水分利用效率在一天中的变化趋势为上午6时最高,后降低,在16时逐渐升高。通过观察研究,无刺美国皂荚表现了较好的生长和适应能力。但作为刚引进3年的一个树种还有许多问题尚待研究,如不易直立生长,所以无刺美国皂荚现在仍不宜大面积造林栽培。
The seedlings of Gleditsia triacanthos inermis were propagated by the seeds from American, and the adaptability of the two--year seedlings were studied. Relative studies showed that the germination rate of the seeds of Gleditsia triacanthos inermis can be increased on soaking seeds with water in primal temperature 100℃. The studies also show that the seedlings have a strong drought resislance and cold - resistance and can grow up in Beijing. The diurnal changes of photosynthetic characteristics in July presented varied in a single-peak manner and the major reason for the change of photosynthesis was stomatal factor. Diurnal changes of transpiration rate also presented varied in a single peak manner. Diurnal changes of WUE declined from morning to 16：00 and then WUE has a gradually rising. So Gleditsia triacanthos inermis has a good adaptability in Beijing by two--year study. But large-scale afforestation is not suitable now,because many issues such as non vertical growth have to be studied.
出处
《山东林业科技》
2008年第5期11-12,27,共3页
Journal of Shandong Forestry Science and Technology
关键词
无刺美国皂荚
引种
实生苗
Gleditsia triacanthos inermis
Introduce
Seedling
