【摘要】 采用Li-cor6400便携式光合仪,对山西省吉县蔡家川流域试验区内刺槐的光合速率、蒸腾速率、气孔导度及其环境因子进行了观测,并辅以不同水分梯度下的林木生理指标观测与比较,研究了生理指标与环境因子之间的相互关系。结果表明:刺槐在生长过程中没有充足水分供应时,光合速率会出现负值;蒸腾日变化曲线单峰或双峰取决于土壤水分条件;各环境因子之间呈显著相关关系,综合作用于蒸腾速率,其中光合有效辐射是蒸腾速率的主要影响因子;气孔导度与相对湿度的变化一致,它们之间显著相关,呈二次项曲线关系。更多还原

【Abstract】 The photosynthetic rate,transpiration rate,stomatal conductance and environmental elements of Robinia pseudoscacia L.in the test field of Caijiachuan watershed of Jixian of Shanxi Province were measured with a portable photosynthesis system(Li-6400),physio-ecological characteristics were studied and compared under different soil moisture gradient,correlation between characteristics and environment elements were studied.The results show that the photosynthetic rate would bring negative number if Robinia pseudoscacia L.hasn’t enough moisture during its growth;daily variation of transpiration rate displays a double-peak or a single-peak pattern,which depended on soil moisture condition;environmental elements correlated significantly with each other,they operated on transpiration rate together,the photosynthetic active radiation is the main factor which affects transpiration;the variation of stomatal conductance accords with reference humidity,it presents a quadratic relation with reference humidity.更多还原