凝结水输入差异下狭果鹤虱幼苗的水分和光合生理  

Water and photosynthetic physiology of Lappula semiglabra seedlings under different dew input amounts

作　　者：龚雪伟 吕光辉[1,3] Martin Welp Siegmund Missall 玉米提.哈力克 牟宗江 

机构地区：[1]绿洲生态教育部重点实验室,乌鲁木齐830046 [2]新疆大学资源与环境科学学院,乌鲁木齐830046 [3]新疆大学干旱生态环境研究所,乌鲁木齐830046 [4]德国埃伯斯瓦尔德应用技术大学森林与环境学院,德国埃伯斯瓦尔德16255 [5]德国埃希施塔特-因戈尔施塔特天主教大学数学与地理学院,德国埃希施塔特85071 [6]艾比湖湿地国家级自然保护区管理局,新疆博乐833400

出　　处：《生态学杂志》2017年第8期2198-2205,共8页Chinese Journal of Ecology

基　　金：国家自然科学基金项目(41571034);国家留学基金委创新型人才国际合作培养项目(留金美[2015]7006号)资助

摘　　要：凝结水作为荒漠生态系统一种重要的补充水源,其输入量的增加或者减少都将对荒漠短命植物的生态过程产生重要影响。选择艾比湖湿地国家级自然保护区为研究区,研究模拟少凝结水(W_0)、自然凝结水(W_1)和倍增凝结水(W_2)3种不同凝结水量输入下短命植物狭果鹤虱(Lappula semiglabra)幼苗的水分和光合生理适应对策。结果表明:倍增凝结水会明显改善狭果鹤虱幼苗的水分状况,而少凝结水导致狭果鹤虱幼苗叶片的水势和含水量不同程度的降低;少凝结水致使狭果鹤虱幼苗蒸腾速率和净光合速率显著降低(P<0.05),且净光合速率日走势由双峰曲线转变为单峰曲线;凝结水倍增可以延缓狭果鹤虱幼苗气孔导度的降低过程,少凝结水降低狭果鹤虱幼苗叶片气孔导度;凝结水输入差异对狭果鹤虱幼苗叶片胞间CO_2浓度无显著影响(P>0.05);狭果鹤虱幼苗叶片的水分利用效率在不同凝结水量输入下无显著差异(P>0.05),体现了荒漠短命植物稳定的水分利用策略。As an important supplementary water source, dew plays an irreplaceable role in the desert ecosystem. Changes in input amount of dew can exert an important impact on the ecological processes of ephemerals. The effect of dew input on water and photosynthetic physiology of Lappula semiglabra seedlings were investigated under three simulated dew levels, reduced amount （W0）, natural amount （W1） and doubled amount （W2）, in Ebinur Lake Wetland National Nature Reserve in Xinjiang, China. The results showed that doubled dew treatment significantly improved plant water status of seedlings, whereas reduced dew treatment decreased leaf water potential and water content of seedlings to some degrees. Under reduced dew treatment, the transpiration rate and net photosynthetic rate of seedlings （P〈0.05） decreased significantly, moreover, the net photosynthetic rate changed from doublepeak curve to singlepeak curve. Doubled dew treatment delayed the reduction process of stomata conductance of seedlings, while reduced dew treatment decreased stomata conductance of seedlings. Difference in dew input amount had no significant effect on intercellular CO2 concentration. The instantaneous water use efficiency of the leaves of L. semiglabra seedlings did not exhibit marked difference （P〉0.05） under different dew input amounts （P〉0.05）, which indicated a stable water use strategy of desert ephemerals.

关 键 词：荒漠生态系统 短命植物 水分利用效率 气体交换参数 

分 类 号：Q945.11[生物学—植物学]