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在塔克拉玛干沙漠南缘的中国科学院策勒沙漠研究站植物引种筛选实验区内,以3 a生文冠果、花棒和紫叶小檗为实验材料,研究三种植物经历持续干旱到短期复水过程中的生理生态响应。结果表明:(1)干旱复水后花棒和紫叶小檗的chla、chlb、叶绿素总量以及chla/b值均随土壤含水量的增加而显著增加,文冠果的叶绿素及其组分含量减少。水分变化对chla含量影响较大。(2)三种植物的MDA含量、SS含量在复水后并没有减少,而是显著的增加,文冠果的增加量最大;各物种的脯氨酸的含量降低,紫叶小檗减少的最多。(3)三种植物的清晨水势和正午水势随土壤水分含量的增加而降低,花棒和紫叶小檗的水势变化较小,水分亏缺迹象不显著。文冠果和花棒的抗逆性较强,而紫叶小檗对水分变化比较敏感。本研究结果可为研究区引种植物的适应性及防护林建设中的植物种选择提供理论参考。
In the southern part of the Taklimakan Desert, at the Celestic Desert Research Station of Chinese Academy of Sciences, the experiment was conducted in the plant introduction and selection experiment. The results showed that the three plants were under continuous drought and short-term rehydration Physiological and ecological response. The results showed that: (1) The contents of chla, chlb, total chlorophyll and chla / b of barberry and barberry were significantly increased with the increase of soil water content after drought rewatering, but the content of chlorophyll and its components decreased . Changes in water content of chla greater impact. (2) The contents of MDA and SS in the three plants did not decrease but significantly increased after rewatering, but the content of proline in all species decreased and that of barberry in the leaves reduced most. (3) The morning water potential and noon water potential of three plants decreased with the increase of soil water content. The change of water potential of barberry and barberry of Prunus pubescens was small, and the water deficit showed no obvious sign. The resistance of Xanthoceras sorbifolia and Huanghua was stronger, while the leaf of barberry was more sensitive to the changes of water content. The results of this study can provide theoretical references for the adaptability of introduced plants in the study area and the selection of plant species in the construction of shelterbelts.