Zhang Zhao-bin, Shi Zuo-an, Zhu Dong-fang, Song Li-yu, Wang Yan, Zhang Shu-yan, Zhang Jing-nan, Li Xian-li
College of Horticulture Science and Engineering, Shandong Agricultural University, Tai' an 27108, Shandong, China.
Ying Yong Sheng Tai Xue Bao. 2009 Sep;20(9):2129-34.
Taking two-year-old Diospyros kaki as test material, this paper studied the effects of high CO2 concentration (700 micromol x mol(-1)), high temperature (5 degrees C higher than the mean daily temperature); and their combination on the net photosynthesis rate (Pn), evapotranspiration (Tr), stomatal conductance (Gs), water use efficiency (WUE), chlorophyll content, Fv/Fm, and Fv/Fo under different soil moisture conditions, with the ambient air temperature and CO2 concentration (380 micromol x mol(-1)) as the control. Under all test soil moisture conditions, the combination of high CO2 concentration and high temperature decreased the Tr and Gs, but increased the WUE. This combination increased the Pn when the soil moisture content was 75%-85% and 55%-65% of field capacity, but decreased the Pn when the soil moisture content was 35%-45%. High CO2 concentration increased the Pn and WUE but decreased the Gs and Tr under all test soil moisture conditions. The effects of high temperature and its combination with high CO2 concentration on the WUE depended on soil moisture condition, with the WUE increased with increasing soil moisture content. Comparing with the control, high CO2 concentration also increased the leaf Chla, Chlb, Chl (a + b), and Car concentrations and the Fv/Fm and Fv/Fo values, relieved the water stress, and increased the stress-resistance of D. kaki.
以两年生柿树为试验材料，以环境气温和二氧化碳浓度（380 μmol·mol⁻¹）为对照，研究了高二氧化碳浓度（700 μmol·mol⁻¹）、高温（比日平均温度高5℃）及其组合对不同土壤水分条件下净光合速率（Pn）、蒸腾速率（Tr）、气孔导度（Gs）、水分利用效率（WUE）、叶绿素含量、Fv/Fm和Fv/Fo的影响。在所有试验土壤水分条件下，高二氧化碳浓度和高温组合降低了Tr和Gs，但提高了WUE。当土壤含水量为田间持水量的75%-85%和55%-65%时，该组合提高了Pn，而当土壤含水量为35%-45%时，该组合降低了Pn。在所有试验土壤水分条件下，高二氧化碳浓度提高了Pn和WUE，但降低了Gs和Tr。高温及其与高二氧化碳浓度组合对WUE的影响取决于土壤水分条件，WUE随土壤含水量增加而提高。与对照相比，高二氧化碳浓度还提高了叶片叶绿素a、叶绿素b、叶绿素（a+b）和类胡萝卜素浓度以及Fv/Fm和Fv/Fo值，缓解了水分胁迫，提高了柿树的抗逆性。
