摘要
以引种于干热河谷典型地区元谋的沙漠葳(Chilopsis linearis)为研究对象,测定其旱季水势、叶片保水能力、净光合速率(Pn)、蒸腾速率(Tr)、气孔导度(Cond)、胞间CO2浓度(Ci)等生理指标的日动态变化。结果表明:在干旱胁迫下,沙漠葳植株通过降低水势以有效地从土壤中吸取水分;沙漠葳叶片失水曲线总体平缓,水分保持能力强;其光合日进程曲线为双峰曲线,在一天中温度、光照和水分条件恶劣的14:00左右仍具有一定的光合能力。耐旱生理研究与田间生长观察表明,沙漠葳可适应干热河谷的恶劣气候并能正常生长。
Study on daily changes in physiological characteristics Chilopsis linearis, a introduction tree to dry-hot valley. The testing index included water potential, de-tached leaves dehydration change, photosynthesis rate, stomata conduct- ance, leaf transpiration rate and intercellular CO2 concentration. The results showed that Ch. linearis reduced water po- tential to availabIy absorb water from soil under drought stress , de-tached [eaves dehydration was slow and water keeping ability was better. Ch. linearis photosynthesis daily progress was a double peak curve, it maintained low photosynthesis at 14：00 when the temperature, sunlight and soil water were all bad. The results of physiological characteristics and field growing showed that Ch. linearis adapted adverse weather of dry-hot valley and grew normally.
出处
《南京林业大学学报（自然科学版）》
CAS
CSCD
北大核心
2009年第6期83-86,共4页
Journal of Nanjing Forestry University：Natural Sciences Edition
基金
国家"十一五"科技支撑计划(2006BAD03A0101
2006BAD03A0304)
关键词
沙漠葳
引种
干热河谷
抗旱生理
Chilopsis linearis
introduction
dry-hot valley
drought resisting physiological characteristics
