土壤干旱胁迫对银杏幼苗光合特性的影响  

Effects of Soil Drought Stress on Photosynthetic Characteristics of Ginkgo biloba Seedlings

作　　者：刘晓静[1] 刘佩迎 张谦 张义群 孙立民[1] 门晓妍 邢世岩[1] LIU Xiao-jing;LIU Pei-ying;ZHANG Qian;ZHANG Yi-qun;SUN Li-min;MEN Xiao-yan;XING Shi-yan(College of Forestry/Shandong Agricultural University, Tai’an 271018, China;Yaoxiang Forest Farm of Shandong Province, Jinan 250100, China)

机构地区：[1]山东农业大学林学院,山东泰安271018 [2]山东省药乡林场,山东济南250100

出　　处：《山东农业大学学报（自然科学版）》2018年第3期467-472,共6页Journal of Shandong Agricultural University：Natural Science Edition

基　　金：国家重点研发计划课题(2017YFD0600701)

摘　　要：为了探索银杏的需水特性,探讨银杏叶片光合作用在不同土壤水分条件下的变化过程及各生理指标与土壤水分含量的关系。选择2年生银杏幼苗作为试验材料,采用人工供水后自然耗水的方法获取一系列土壤水分梯度,利用便携式CIRAS-2型光合作用系统测定7种不同土壤水分含量下的光合速率、蒸腾速率、水分利用效率、胞间CO2浓度及气孔导度等生理参数的光响应过程,同时对银杏叶片的光合色素含量和渗透调节物质进行检测。结果表明轻度水分胁迫,即土壤相对含水量为60%左右时,最适宜银杏的生长。银杏生长所允许的最大水分亏缺在RWC为46.81%左右,银杏同时维持较高的净光合效率和水分利用效率的土壤相对水分含量范围为59.61%~84.72%。试验结果为加强银杏水分管理、确保银杏生长良好提供了理论基础和技术支持。In order to explore the water requirement characteristics of Ginkgo biloba, the variation process of photosynthesisin different soil moisture conditions and the relationship between physiological indexes and soil moisture content werediscussed. Two-year-old ginkgo seedlings were chosen as experimental materials, a series of soil water gradients wereobtained by natural water consumption after artificial water supply. Light response process of physiological parameters ofphotosynthesis rate, transpiration rate, water use efficiency, intercellular CO2 concentration and stomatal conductance ofseven different soil moisture contents were determined using the portable CIRAS-2 photosynthesis system, the content ofphotosynthetic pigments and osmotic regulators in leaves of G. biloba were also determined. The results showed the growthof G. biloba was most suitable for mild water stress, that is, the relative water content of soil was about 60%. The maximumwater deficit for G. biloba growth is about 46.81% of RWC. The relative moisture content of the soil with high netphotosynthetic efficiency and water utilization efficiency was 59.61%-84.72%. The experimental results provide theoreticalbasis and technical support for strengthening water management of G. biloba and ensuring good growth of G. biloba.

关 键 词：银杏 干旱胁迫 光合作用 生理特性 

分 类 号：S792.95[农业科学—林木遗传育种] Q945.78[农业科学—林学]