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以塔里木河下游荒漠河岸林中的胡杨群落为研究对象,以群落结构特征、物种多样性和优势种为群落波动的表征值,采用固定样地法对漫溢补水干扰下胡杨群落的波动响应特点进行了研究。结果表明:①干扰后胡杨群落物种组成变化明显,群落中物种数和层次呈现增加趋势,群落结构由简单向复杂转化,群落趋于稳定;②干扰前后胡杨群落物种多样性指数波动性较大,群落物种丰富度和多样性都呈增加趋势,而物种分布均匀度略有下降趋势;③漫溢补水干扰下群落中优势种的数量及种类发生改变,其中胡杨的优势度明显增大了。综上可知,地表漫溢补水植被修复措施使流域内的胡杨群落结构趋于复杂、群落层次增加,群落多样性增加,优势种及其优势度增加,总体上胡杨群落的波动为正向波动。
Taking the Populus euphratica community in the desert riparian forest in the lower reaches of the Tarim River as the research object, the characteristics of community structure, species diversity and dominant species were used to characterize the fluctuation of the community. The fixed-plot method was used to study the fluctuation response characteristics of Populus euphratica community Study. The results showed that: (1) the species composition of Populus euphratica community changed obviously after disturbance, the species number and the level of the community showed an increasing tendency, the community structure changed from simple to complicated, and the community tended to be stable; (2) The species diversity index of Populus euphratica community before and after the disturbance was relatively large, The species richness and diversity of community showed an increasing trend, while the species distribution uniformity decreased slightly. ③The number and species of dominant species in the community changed under the disturbance of overflowing water, in which the dominance of Populus euphratica obviously increased. It can be seen that the measures of surface overflowing water-replenishing vegetation make the structure of Populus euphratica community complex, the community level increases, the community diversity increases, the dominant species and their dominance increase. Generally speaking, the fluctuation of Populus euphratica community is positive.