民勤盐渍荒漠草地盐爪爪群落和芦苇群落的季相变化特征

Characteristics of Seasonal Variation of Kalidium foliatum Community and Phragmites communis Community of Saline Desert Grassland in Minqin

为了掌握民勤荒漠草地盐生植物群落的季相变化特征,为民勤荒漠草地保护、生产力的恢复与合理利用提供科学依据。采用样线法和样方法对民勤盐渍荒漠草地盐爪爪群落和芦苇群落进行调查,通过对5月、7月和9月调查数据的统计,分析2个群落的组成及季相变化特征。结果表明:民勤荒漠草地盐生植物群落灌木层伴生物种组成相对稳定;盐爪爪群落灌木层和草本层的盖度7月份最大;芦苇群落灌木层和草本层的盖度9月份达到最大。从5月到9月份盐爪爪群落和芦苇群落草本层伴生种组成随季节变化不大,盐爪爪群落草本层植物的种数、盖度和冠幅7月份最大;芦苇群落草本层植物的种数、盖度和冠幅逐渐增大,9月份植物种最多、盖度和冠幅最大,结构变得复杂。这主要是由于民勤盐渍荒漠草地气候特点、植物自身生理生态特性、分布的立地条件的差异所决定的。

The paper aims to grasp the seasonal variation characteristics of the Halophyte community in desertgrassland of Minqin, provide a scientific basis for desert grassland protection, productivity recover andreasonable utilization. This article adopted line transects method and sample method to investigate Kalidium foliatum community and Phragmites communis community of saline desert grassland in Minqin. Through thesurvey data of May, July and September, the composition and seasonal characteristics of Kalidium foliatum community and Phragmites communis community were analyzed. The results showed that： the composition ofhalophyte community shrub layer associated species was relatively stable, the coverage of Kalidium foliatum community shrub layer and herb layer was the largest in July; the coverage of Phragmites communis communityshrub layer and herb layer had reached the maximum in September. Herbaceous companion speciescomposition of Kalidium foliatum community and Phragmites communis community changed a little withseasons from May to September, plant species, coverage and crown width of Kalidium foliatum community herb layer were the largest in July; plant species, coverage and crown width of Phragmites communis communityherb layer gradually increased and reached the maximum in September, the structure had become complex.This was mainly due to climate characteristics of saline desert grassland in Minqin, physiological andecological characteristics of the plant, and the distribution of site conditions determined by the discrepancy.