摘要
为了探讨银杏对分根区交替灌溉的适应性,以3年生分根盆栽银杏为试材,研究3种供水方式和3个供水量对银杏幼苗生长、光合及水分利用效率的影响。结果表明:分根区交替灌溉能抑制地上部分的过分生长,激发吸收根的生长进而提高根冠比,增强植物的适应能力,吸收根干质量分别比固定根区灌溉和全根区灌溉增加6.7%和37%,根冠比分别提高50.1%和10.7%。分根区交替灌溉在不显著影响银杏水分状况和光合速率的情况下,可以对气孔导度进行有效的调控,减少奢侈蒸腾,提高水分利用效率,其中灌溉水分利用效率值比固定根区灌溉和全根区灌溉分别提高51.7%和33.3%,瞬时水分利用效率值分别提高4%和20.5%,在轻度干旱时银杏苗的水分利用效率最高。分根区交替灌溉对银杏生理、生长指标有显著的影响,是一种有效的节水灌溉技术和生长调控手段。
This study was conducted to evaluate the adaptability of the alternative partial root-zone irrigation （APRI） on Ginkgo biloba. Potted 3-year-old G. biloba with divided root zones were used to investigate effects of irrigation regimes on growth, photosynthesis and water use efficiency （WUE）. Results showed that APRI inhibited the aboveground redundancy vegetative growth, stimulated the absorption root growth and improved the root and shoot ratio. Dry weight of the absorption roots with APRI increased by 6.7% and 37% and the root shoot ratio with APRI increased by 50. 1% and 10.7%, respectively, compared with the fixed partial root-zone subirrigation （PS） and the full root-zone subirrigation （FS）. APRI decreased the stomatal conductance and transpiration without obvious change in leaf water status and photosynthetic rate, therefore the irrigation WUE and leaf instantaneous WUE improved by 51.7% , 33.3% and 4% , 20.5% respectively as compared to PS and FS treatments. In conclusion, APRI had significant influence on physiology and growth of G. biloba seedlings and was an effective method of water saving and growth regulating.
出处
《林业科学》
EI
CAS
CSCD
北大核心
2013年第6期52-59,共8页
Scientia Silvae Sinicae
基金
"十二五"国家科技计划课题(2011BAD38B0104)
江苏省研究生培养创新工程(CXLX11_0545)
关键词
银杏
分根交替渗灌
生长特性
光合速率
水分利用效率
Ginkgo biloba
alternative partial root-zone irrigation
growth features
photosynthetic rate
wateruse efficiency
