| 米海莉,许兴,李树华,何军,马有明.不同生育时期牛心朴子及甘草碳水化合物与全N含量分布部位及C/N比变化规律研究[J].干旱地区农业研究,2005,(1):129~133 |
| 不同生育时期牛心朴子及甘草碳水化合物与全N含量分布部位及C/N比变化规律研究 |
| Dynamic change of the contents、distributions and ratioes of carbohydrate and total nitrogen in Cynanchum komarovii and Glycyrrhiza uralensis during the different periods of growth |
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| DOI：10.7606/j.issn.1000-7601.2005.01.26 |
| 中文关键词: 旱生植物 牛心朴子 甘草 碳水化合物 C/N比 |
| 英文关键词:desert plant Cynanchum komarovii Glycyrrhiza uralensis carbohydrates |
| 基金项目:国家"973"发展规划项目(G1999011705)； 国家"863"领域项目； 宁夏自然科学基金项目(C229) |
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| 中文摘要: |
| 对毛乌素沙漠边缘地带野生植物牛心朴子、甘草不同生育时期碳水化合物、全N含量、分布部位及C/N比的变化规律进行了研究。结果表明:1植物体各个器官均储藏营养物质,但根系是这两种多年旱生植物储藏碳水化合物的主要器官。2牛心朴子、甘草光合产物最终储藏物形式不同,牛心朴子根系以可溶性糖为主,且含量大于甘草;而甘草根系则以淀粉为主。3在生育期内碳水化合物积累和消耗动态变化有差异。总糖含量变化,牛心朴子为减少—减少—增加—减少—增加—增加;甘草为减少—减少—增加—增加—增加—减少。牛心朴子可溶性糖含量变化与总糖一致,而甘草可溶性糖含量变化有时与总糖一致,有时则不一致。4在两种植物体内,全N含量分布同表现为根<茎<叶;C/N比值的变化则为根>茎>叶。5牛心朴子全生育期根系对全N的需求量小于甘草,而叶对全N的需求量却大于甘草。表明可溶性糖既是牛心朴子的主要光合产物储藏物,是生长的主要能源物质,又是干旱胁迫下最好的渗透调节剂。牛心朴子对氮素营养的需求量少,植株体的生长量也小,这就降低对水分的敏感性,耐干旱耐瘠薄的能力相对强于甘草。 |
| 英文摘要: |
| The reseach studied the contents and distributions of carbohydrates and total nitrogen, (C/N) ratioes, and dynamic patterns of carbohydrate and nintrogen in Cynanchum komarovii and Glycyrrhiza uralensis, which grow in the boundary area of the Muus desert. The results showed that every organ had a storing capacity of carbohydrates but the main storing organ was roots in those two kinds of plants. Final storing form of carbohydrate was differenti in both Cynanchum komarovii and Glycyrrhiza uralensis. Soluble sugar was a main storing form in the roots of Cynanchum komarovii, but starch instead of soluble sugar in the roots of Glycyrriza uralensis. There was difference in dynamic change between carbohydrates accumulation and degrading during different growth periods. The change of soluble sugar in Cynanchum komarovii was very similar to the change of total sugars, but not in Glycyrrhiza uralensis. The total nitrogen was the highest in leaves, followed by stems, and then by roots. The change in C/N ratio was quite contrary compared with that of total nitrogen. Compar ison with the roots of Glycyrrhiza uralensis showed that the roots of Cynanchum komarovii needed less nitrogen during it's whole growth; But the requirement of nitrogen was much higher in Cynanchum komarovii roots than that of Glycyrrhiza uralensis roots. It indicated that the soluble sugar was not only the main photosynthate, but also the good osmatically regulating material in Cynanchum komarovii under water stress. Low requriement of nitrogen in Cynanchum komarovii reduced the susceptibility to water stress and also made Cynanchum komarovii have a higher resistance to drought and infertility. |
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