摘要
可溶性碳水化合物是参与植物生命代谢的重要物质。羊草根茎不仅是重要的营养繁殖器官，也是养分的重要贮藏器官。通过对松嫩平原沙地和盐碱地2种生境羊草种群根茎可溶性碳水化合物含量变化的分析，结果表明：
(1) 从开花期至生长季末期，2个生境根茎中可溶性碳水化合物含量呈现出相似地规律性变化。从花期到腊熟期可溶性碳水化合物含量呈现增加的趋势，但在果后营养初期出现最低值，生长季末期达到最高值。
(2)沙地和盐碱地不同生长季根茎可溶性碳水化合物含量皆为1a﹥2a﹥3a。即随着龄级的升高，可溶性碳水化合物含量呈递减趋势。除果后营养初期外，各龄根茎可溶性碳水化合物含量的差异都达到了显著水平（P≤0.05）。根茎是按照实际生活年限划分的，根茎可溶性碳水化合物含量随龄级升高而降低的趋势，非常充分地说明了不同龄级根茎生活力和生育力的差别，从而为羊草无性系种群年龄结构的划分方法的科学性提供了佐证。
(3)根茎顶端芽是羊草进行营养繁殖、扩展其生态位空间的重要构件，但其可溶性碳水化合物含量在各生长季（生长季末期除外）的含量并不高，甚至还低于3a根茎可溶性碳水化合物含量。
(4) 除了沙土地果后营养初期之外，就贮藏可溶性碳水化合物的绝对含量而言，茎基部占第一位，其次是根茎，最少的是分蘖节。
(5)通过方差分析，沙地和盐碱地不同生育期节和节间的差异达到了显著水平（P≤0.05）。
(6) 方差分析表明，除了开花期，不同龄级分蘖节之间差异都没有达到显著水平（P﹥0.05）。
(7)根茎无芽节始终大于有芽节中可溶性碳水化合物含量。
Water-soluble carbohydrate plays an important role in metabolism of the plant. The rhizome of Leymus chinensis is not only the important organ of vegetative reproduction, but also the important storage organ.The contents of water-soluble carbohydrate of the rhizome of Leymus chinensis in two inhabits of sand soil and saline soil during the different development stages were studied on the Songnen Plain of China. The results showed that:
(1) The contents of water-soluble carbohydrate of rhizome in two inhabits changed similarly and regularly from the flowering stage to the end of growth season. From the flowering stage to the dough ripe stage, the contents of water-soluble carbohydrate increased, while were the lowest values at the beginning of the stage after fruiting, and reached the highest values at the end of the growing season.
(2) The contents of water-soluble carbohydrate of rhizome at different development stages in the inhabits of sand soil and saline soil decreased with the ages increasing, and the order was 1a﹥2a﹥3a. The difference of the content of water-soluble carbohydrate between the different age classes of the rhizomes in the inhabits of sand soil and saline soil during the different development stages reached the significant level（P≤0.05）. Because the ages of rhizome were divided according to actual living years, the trend of decreasing of the contents of water-soluble carbohydrate of rhizome with the age increasing adequately showed the obvious difference of viability and fecundity of different ages of rhizome, which was a direct support for scientific method of division of age structure of Leymus chinensis population, a clonal population of rhizome type grass.
(3) The bud of the rhizome apex is an important module for Leymus chinensis population in the process of vegetative propagation to expand eco-space. But the contents of water-soluble carbohydrate in the bud of the rhizome apex were not high except for the end of growth season, and even lower than that of the rhizome of the 3rd age class.
(4) Except for the beginning of the stage after fruiting of sand soil, as for the absolute contents of water-soluble carbohydrate which were stored, the base stem was the most, the second was the rhizome, the least was the tillering node.
(5) The variance analysis showed that the difference of the content of water-soluble carbohydrate between the rhizome node and the rhizome internode in the inhabits of sand soil and saline soil reached the significant level（P≤0.05）during the different development stages.
(6) The variance analysis showed that the difference of the content of water-soluble carbohydrate between rhizome node and rhizome internode in the inhabits of sand soil and saline soil during the different development stages did not reach the significant level（P﹥0.05）except for the flowering stage.
(7) The contents of water-soluble carbohydrate of budless node were higher than that of gemmate node.
引文
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