论文部分内容阅读
以两年生柿树为试材,研究了高浓度CO2处理(700μmol.mol-1)、高温处理(日平均温度高于正常日平均温度约5℃)、高温和高浓度CO2复合处理及对照(温度为外界环境温度,CO2浓度380μmol.mol-1)对不同水分条件下柿树净光合速率(Pn)、蒸腾速率(Tr)、气孔导度(Gs)、水分利用效率(WUE)、叶绿素含量和叶绿素荧光参数Fv/Fm、Fv/Fo的影响.结果表明:高温和高浓度CO2复合处理使处于各水分条件下的柿树Tr、Gs减小,WUE增大;在高、中水分条件(分别为田间持水量的75%～85%和55%～65%)下高温和高浓度CO2复合处理使柿树Pn增大,在低水分条件(为田间持水量的35%～45%)下使柿树Pn减小.高浓度CO2处理使处于各水分条件下的柿树Pn、WUE增大,Gs、Tr减小.高温及高温和高浓度CO2复合处理下WUE均受土壤水分状况的影响,并随土壤含水量的升高而升高.与对照相比,高浓度CO2处理还提高了各水分条件下植株叶片水平的水分利用效率、叶绿素a、叶绿素b、叶绿素(a+b)、类胡萝卜素含量及Fv/Fm和Fv/Fo,缓解了水分胁迫,提高了柿树的抗逆能力.
Two-year-old persimmon was used as experimental material to study the effects of high-concentration CO2 treatment (700μmol.mol-1), high temperature treatment (daily average temperature higher than normal daily average temperature about 5 ℃), high temperature and high CO2 concentration treatment and control (Pn), transpiration rate (Tr), stomatal conductance (Gs), water use efficiency (WUE) and chlorophyll content of persimmon under different water conditions under the conditions of temperature, external temperature and CO2 concentration of 380μmol.mol- And Fv / Fm and Fv / Fo of chlorophyll fluorescence parameters were studied.The results showed that under high temperature and high CO2 concentration, the Tr, Gs and WUE of persimmon trees under various water conditions decreased and the WUE increased. Under the conditions of high and medium water Which were 75% -85% and 55% -65% of the field water holding capacity, respectively). Under the condition of low water content (35% -45% of field capacity) Pn and WUE of persimmon trees increased under high and low CO2 concentration, while Gs and Tr decreased under high and low CO2 concentration.WUE under high temperature and high temperature and high CO2 concentration were affected by soil water status , And increased with the increase of soil water content.Compared with the control, high concentration of CO2 treatment also increased the plant leaves under various water conditions Flat water use efficiency, chlorophyll a, chlorophyll B, chlorophyll (a + b), and carotenoid Fv / Fm and Fv / Fo, to ease the stress, improve the persimmon resilience.