中文摘要：

选取闽江河口湿地入侵植物互花米草（Spartina alterniflora）为研究对象，测定其各个构件生物量和钾元素含量季节变化，结果表明：互花米草地上部分各个构件钾元素含量从春季到冬季逐渐减少，除夏季外，其余季节绿茎和绿叶钾元素含量显著高于立枯部分（P〈0．05），花仅出现在秋冬季节，且在秋季钾元素含量达到峰值（8．97±0．51mg·g^-1）；地下部分不同深度根系钾元素含量全年波动较小，在4．38±0．87mg·g^-1～7．34±0．56mg·g^-1之间，无明显季节变化规律；不同季节绿茎和绿叶钾元素积累量均显著大于立枯部分（P〈0．05），钾元素积累量主要集中在绿茎，其次为绿叶；地下部分，不同季节，钾元素积累量均随着深度的增加而减少，夏季地下总积累量达到全年最低值7．89±2．60g·m^-2；地上和地下部分总的钾元素积累量秋季最高（38．10±3．38g·m^-2），冬季最低（23．77±6．38g·m^-2），全年除冬季外，其余各个季节均无显著性差异（P〉0．05）；不同构件中生物量与钾元素含量对钾元素的积累量的影响程度不同。

英文摘要：

Taking the invasive Spartina alterniflora in the Miniiang River estuary as test objectives, this paper studied the seasonal dynamics of kalium and biomass in different organs of S. alterniflora. The results showed that, on one hand, the kalium content in different organs of aboveground S. alterniflora was reduced gradually with the growing process in the general changing trend within a growing season. Except in the summer, the kalium content in green part was significantly higher than standing dead of S. alterniflora （P〈0.05）. The flower had maximum kalium content （8.97±0.51mg·g^-1） in winter and only appeared in autumn and winter. On the other, the kalium content of underground part of different depth roots, with no obvious changes, ranged between 4.38 ± 0.87 mg·g^-1 and 7.34 ±0.56 mg·g^-1 In addition, the accumulation of kalium in green part was significantly higher than that of standing dead of S. alterniflora （P〈0. 05）, while the main concentration was in the green stem, followed by green leaf. As for the underground part, the accumulation of kalium reduced with the increment of the depth, and had minimum kalium accumulation （7.89 ±2.60mg·g^-2） in summer. To some extent, the total accumulation of kalium measured tallest in autumn （38.10 ± 3.38mg·g^-2）, and lowest in winter （23.77±6.38mg·g^-2）. Except in winter, there are no significant differences （P〉0. 05） in the other seasons. Biomass and contents of kalium had different influences on kalium accumulation in different organs of S. alterniflora.