【摘要】 采用Li-6400便携式光合仪在模拟光照条件下,对不同水分处理的白榆、沙棘进行观测。观测参数包括:净光合速率、气孔导度、蒸腾速率、胞间CO2浓度等。并且运用SPSS数据处理软件进行分析,从而确定白榆、沙棘光合生理参数与土壤含水量之间的关系,并在研究过程中对试验地土壤水分进行有效性评价;其等级分别为:无产无效水、低产低效水、高产高效水、高产低效水。而把高产高效水作为指导当地林业生产的土壤水分管理条件。结果表明白榆沙棘具有高产高效的土壤含水量分别为11.4%~17.2%;9.5%~16.5%。更多还原

【Abstract】 With the aid of the Licor-6400 portable photosynthesis system,Ulmus pumila and Hippophae rhamnoides under different soil water condition were measured under the simulated photosynthetic radiation.The quantitative relation content photosynthetic rate,stomatal conductance,intercellular CO2 concentration,transpiration rate and so on,and analysis data with spss,the relation between water utilization efficiency and soil water content is known,and valid assessment of soil water in the studying process is made,their classification respectively is no-output and no-efficiency water,low-output and low-efficiency water,high-output and high-efficiency water,high-output and low-efficiency water.But high-output and high-efficiency is the conditions of managing soil water.The result shows that the soil water content in which Ulmus pumila and Hippophae rhamnoides have high-output and high-efficiency respectively is 11.4%～17.2%;9.5%～16.5%.更多还原