伊犁乌孙塔乌山不同海拔地段鸭茅群落种类组成及种群数量特征研究

Study on the Species Composition and the Quantitative Features of Populationof Dactylis glomerata at Different Altitudes of Wusuntawu Mountain in Yili

【目的】了解伊犁昭苏不同海拔地段鸭茅在自然生长条件下群落特征的变化。【方法】利用群落植物重要值、高度、盖度、密度和地上生物产量指标,比较分析海拔1 800、2 000和2 200 m草地群落植物组成与群落数量特征的变化。【结果】研究区鸭茅群落的种类组成与鸭茅种群数量特征,在不同海拔地段呈现明显差异。在海拔2 000 m,草地群落植物组成的高度、盖度、密度和地上生物学产量的值都呈现最大,其中鸭茅种群的各项数量指标也达到最大。【结论】乌孙塔乌山山地,海拔2 000 m区域是鸭茅最适宜生长地;海拔对鸭茅群落的分布、种类组成与数量特征影响具有重要的生态学意义。

【Objective】The community features of Dactylis glomerata were studied by investigating the important value,height,branch coverage,density,aboveground biomass of plant group at the different altitudes from 1 800 m,2 000 m and 2 200 m in Wusuntawu Mountain in Yili.【Result】Results showed that the compositions and quantitative features of plant community displayed obvious difference at different altitudes. The important value,height,branch coverage,density,aboveground biomass of the plant group reached the maximum,and among them the index of the Dactylis glomerata reached the maximum,too.【Conclusion】The area at the altitude 2 000 m was optimum for Dactylis glomerata growing. The altitude was significant to the community distribution,species composition and quantitative features.