不同种植环境下白洋淀芦苇群落和生长特征研究

Comparative study on the community and growth characteristics of reed in Baiyangdian under two introduced environments

为解决宁夏吴忠黄河湿地本地芦苇群落明显退化的问题,通过异地引种白洋淀芦苇,采用斜茎种植方法,在两种不同环境下(玉带湖芦苇四周环水,年平均水位在8 cm;树木园湖芦苇一边靠岸,三面环水,年平均水位在35 cm)进行芦苇野外种植实验,通过对比其株高、株径、盖度、节间数及展叶数等生长指标,研究异地引种芦苇生长指标和生物多样性指标的年内、年际差异。结果表明:①芦苇作为沼生植物,栽种时保持良好的水位条件有利于提高成活率,生长期内35~45cm的水深能显著提高芦苇生长,是芦苇生长的适宜生态水位。②不同水位影响芦苇的形态,水位过高芦苇的植株个体相对较为细长。③引种后的白洋淀芦苇生长并未达到原母株的生态型,这可能与异地引种、生境的差异性有关。

The field planting experiment was carried out with reed as the research object.Through remote introduction,the island planting was adopted in Yudai Lake,which was surrounded by water with an average annual water level of 8cm.The arboretum is planted in strips,with one side reaching the shore and three sides surrounded by water.The average annual water level is 35cm.By comparing plant height,plant diameter,number of live plants,coverage,number of internodes,number of leaves spread and other growth index data,through field sampling and laboratory analysis,the annual and dynamic changes of growth index and community index of reeds introduced from different places were studied.Studies have shown that(1)As a marsh plant,maintaining good water level conditions when planting reed is conducive to improving survivalrate.During the growth period,water depth of 35~45 cm can significantly increase the growth of reed,which is the appropriate ecological water level for reed growth.(2)Different water levels affect the morphology of reeds,and the individual plants with high water level of reeds are relatively slender.(3)The research showed that the growth of The baiyangdian Reed after introduction did not reach the ecotype of the original plant,which may be related to the difference of the alien species and habitat.