摘要
以小蓬竹为材料,研究其水分利用率的日变化、季节变化及其与主要环境因子的关系,以了解小蓬竹的水分利用状况,为其作为喀斯特地区恢复树种提供科学依据.结果表明:小蓬竹叶片水分利用效率日变化曲线在1月为单峰型;4月为双峰型;7月和9月早间最高,之后逐渐下降.1年中,夏秋两季水分利用效率较低(日均值分别为1.72,1.99μmol·mmol^(-1)),春季居中(日均值3.71μmol·mmol^(-1)),冬季最高(日均值5.74μmol·mmol^(-1)).不同月份水分利用效率日变化的主要影响因子为空气相对湿度、叶片温度以及气孔导度等;全年尺度上小蓬竹水分利用效率的主要影响因子为胞间CO_2浓度、气孔导度以及叶片温度.
Taking Drepanostachyum luodianense as material, diurnal changes and seasonal change of the water use efficiency and its relationship with various influence factors were studied, as a karst area recovery tree used to provide a scientific basis. The results were summarized as follows： The diurnal variation of water use efficiency （WUE） of D. luodianense showed a single peak curve in January, and twin-peaked in April. In July and September, it decreased from the morning. In the whole year, water use efficiency was lower in summer and fall （ daily averages were 1.72 μmol·mmol^-1, 1.99 μmol ·mmol^-1 respectively）, secondly in spring （daily average was 3.71 μmol· mmol^-1 ）, and largest in winter （daily average was 5. 74 μmol· mmol^-1）. The main impact factors of diurnal variation of water use efficiency in different months were air relative humidity, leaf temperature and stomatal conductance; and intercellar CO2 concentration, stomatal conductance and leaf temperature were the main impact factors with whole year＇ s time scale.
出处
《安徽大学学报（自然科学版）》
CAS
北大核心
2017年第2期100-108,共9页
Journal of Anhui University(Natural Science Edition)
基金
贵州省科技厅对外合作项目[黔科合外G字(2009)70010]
贵州省林业厅重大项目(黔林科合[2010]重大04号)
贵州大学引进人才科研项目
关键词
小蓬竹
水分利用率(WUE)
日变化
季节变化
影响因子
Drepanostachyum luodianense
water use efficiency （WUE）
diurnal changes
seasonal change
impact factor
