Abstract: In this article authors have compared carbohydrate contents in secon-dary sink (stem+ leaf sheath) of rice grown at three different altitude localities under the same variety is used and conditions of the same soil, basal and top dressing. The fesults showed that all the contents of total sugar or starch in secondary sink increase as the raising altitude during the +full heading time and the yellow ripe stage. As compared with the full heading titue, their contents increase at the high-altitude,localities, but deerease at the low-altitude localities, during the yellow ripe stage. At the full heading time the starch contents in secondary sink decrease as the increasing dose of basal dressing with nitrogenous fertilizer. At the yellow ripe stage the starch contents in secondary sink of each treatment increase as the increa-sing dose of basal dressing with nitrogenous fertilizer in the warm-cool rice belt. The starch contents in secondary sink of rice tend towards conformity at the low-heat localities, as comparcd with each treatment at different localitieS, however, all the increases of starch contents in secondary sink are due to raised altitude.

Key words: Rice

摘要： 在品种、土壤、底肥和追肥等一致的情况下，对三个不同海拔地区种植的水稻的次库（茎十叶鞘）中碳水化合物含量作了比较，结果表明：齐穗和黄熟期次库中总糖或淀粉含量均随海拔增高而增加。但在黄熟期，高海拔地区次库的总糖或淀粉含量比齐穗期的增加，而低海拔地区次库的总糖或淀粉含量则比齐穗期的降低。齐穗期时，次库的淀粉含量随施用的氮素底肥量的增加而降低。在黄熟期，温凉稻作区水稻次库的淀粉含量均随氮素底肥施用量的增加而增加，低熟地区水稻次库的淀粉含量则趋于一致，不过不同地区相比各处理次库的淀粉含量均因海拔增高而增加。不同时期的氮索追肥使齐穗期次库淀粉含量因追肥时间推迟而增加，唯元江晚穗肥处理的低于中穗肥处理的。黄熟期因追肥时间提早而次库的淀粉含量增加，但元江以早穗肥处理的次库淀粉含量最低。与齐穗期相比时，低海拔地区的各个处理，其次库的淀粉含量均减低，但高海拔的昆明温凉稻作区，施早和中穗肥的水稻，在黄熟期次库的淀粉含量反而增高。还可以看出水稻种植地海拔越高，其次库淀粉含量对追肥时间越敏感。基于水稻次库中淀粉含量对氮素肥料的反应，就三地气候条件讨论了上述的差异。

关键词: 水稻, 氮索肥料, 次库（茎十叶鞘）, 淀粉